1.
Space Shuttle Atlantis
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Space Shuttle Atlantis is a Space Shuttle orbiter belonging to the National Aeronautics and Space Administration, the spaceflight and space exploration agency of the United States. Its maiden flight was STS-51-J from 3 to 7 October 1985, Atlantis embarked on its 33rd and final mission, also the final mission of a space shuttle, STS-135, on 8 July 2011. STS-134 by Endeavour was expected to be the flight before STS-135 was authorized in October 2010. STS-135 took advantage of the processing for the STS-335 Launch On Need mission that would have been necessary if STS-134s crew became stranded in orbit, Atlantis landed for the final time at the Kennedy Space Center on 21 July 2011. By the end of its mission, Atlantis had orbited the Earth a total of 4,848 times. Atlantis is named after RV Atlantis, a sailing ship that operated as the primary research vessel for the Woods Hole Oceanographic Institution from 1930 to 1966. Weight,151,315 pounds Length,122.17 feet Height,56.58 feet Wingspan,78.06 feet Atlantis was completed in half the time it took to build Space Shuttle Columbia. When it rolled out of the Palmdale assembly plant, weighing 151,315 lb, Atlantis is the lightest shuttle of the remaining fleet, weighing three pounds less than the Space Shuttle Endeavour. Space Shuttle Atlantis lifted off on its voyage on 3 October 1985, on mission STS-51-J. It flew one mission, STS-61-B, the second night launch in the shuttle program. Atlantis was then used for ten flights between 1988 and 1992, two of these, both flown in 1989, deployed the planetary probes Magellan to Venus and Galileo to Jupiter. With STS-30 Atlantis became the first shuttle to launch an interplanetary probe, during another mission, STS-37 flown in 1991, Atlantis deployed the Compton Gamma Ray Observatory. Beginning in 1995 with STS-71, Atlantis made seven flights to the former Russian space station Mir as part of the Shuttle-Mir Program. When linked, Atlantis and Mir together formed the largest spacecraft in orbit at the time, Shuttle Atlantis also delivered several vital components for the construction of the International Space Station. During the February 2001 mission STS-98 to the ISS, Atlantis delivered the Destiny Module, the five hour 25 minute third spacewalk performed by astronauts Robert Curbeam and Thomas Jones during STS-98 marked NASAs 100th extra vehicular activity in space. The Quest Joint Airlock, was flown and installed to the ISS by Atlantis during the mission STS-104 in July 2001. The successful installation of the airlock gave on-board space station crews the ability to stage repair, the first mission flown by Atlantis after the Space Shuttle Columbia disaster was STS-115, conducted during September 2006. The mission carried the P3/P4 truss segments and solar arrays to the ISS, on ISS assembly flight STS-122 in February 2008, Atlantis delivered the Columbus laboratory to the ISS
2.
Shuttle Carrier Aircraft
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The Shuttle Carrier Aircraft were two extensively modified Boeing 747 airliners that NASA used to transport Space Shuttle orbiters. One is a 747-100 model, while the other is a short range 747-100SR, the SCAs were used to ferry Space Shuttles from landing sites back to the Shuttle Landing Facility at the Kennedy Space Center. In approach and landing test flights conducted in 1977, the test shuttle Enterprise was released from an SCA during flight, Air Force would have retained ownership of the C-5, while NASA could own the 747s outright. The first aircraft, a Boeing 747-100 registered N905NA, was manufactured for American Airlines. The aircraft was modified for NASA by Boeing in 1976. While first-class seats were kept for NASA passengers, its cabin and insulation were stripped, mounting struts were added. Vertical stabilizers were added to the tail to aid stability when the Orbiter was being carried, the avionics and engines were also upgraded, and an escape tunnel system similar to that used on Boeings first 747 test flights was added. The flight crew escape system was later removed following the completion of the Approach. Flying with the drag and weight of the Orbiter imposed significant fuel. The range was reduced to 1,000 nautical miles, compared to a range of 5500 nautical miles. Without the Orbiter, the SCA needed to carry ballast to balance out its center of gravity, the SCA had an altitude ceiling of 15,000 feet and a maximum cruise speed of Mach 0.6 with the orbiter attached. A crew of 170 took a week to prepare the shuttle, studies were conducted to equip the SCA with aerial refueling equipment, a modification already made to the U. S. Air Force E-4 and 747 tanker transports for the IIAF. However, during formation flying with an aircraft to test refueling approaches. While these were not likely to have been caused by the test flights, since there was no urgent need to provide an aerial refueling capacity, the tests were suspended. By 1983, SCA N905NA no longer carried the distinct American Airlines tricolor cheatline, NASA replaced it with its own livery, consisting of a white fuselage and a single blue cheatline. That year, this aircraft was used to fly Enterprise on a tour in Europe, with refuelling stops in Goose Bay, Canada, Keflavik, Iceland, England. It then went to the Paris Air Show, in 1988, in the wake of the Challenger accident, NASA procured a surplus 747-100SR from Japan Airlines. Registered N911NA it entered service with NASA in 1990 after undergoing modifications similar to N905NA and it was first used in 1991 to ferry the new shuttle Endeavour from the manufacturers in Palmdale, California to Kennedy Space Center
3.
Ancient Greek
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Ancient Greek includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD. It is often divided into the Archaic period, Classical period. It is antedated in the second millennium BC by Mycenaean Greek, the language of the Hellenistic phase is known as Koine. Koine is regarded as a historical stage of its own, although in its earliest form it closely resembled Attic Greek. Prior to the Koine period, Greek of the classic and earlier periods included several regional dialects, Ancient Greek was the language of Homer and of fifth-century Athenian historians, playwrights, and philosophers. It has contributed many words to English vocabulary and has been a subject of study in educational institutions of the Western world since the Renaissance. This article primarily contains information about the Epic and Classical phases of the language, Ancient Greek was a pluricentric language, divided into many dialects. The main dialect groups are Attic and Ionic, Aeolic, Arcadocypriot, some dialects are found in standardized literary forms used in literature, while others are attested only in inscriptions. There are also several historical forms, homeric Greek is a literary form of Archaic Greek used in the epic poems, the Iliad and Odyssey, and in later poems by other authors. Homeric Greek had significant differences in grammar and pronunciation from Classical Attic, the origins, early form and development of the Hellenic language family are not well understood because of a lack of contemporaneous evidence. Several theories exist about what Hellenic dialect groups may have existed between the divergence of early Greek-like speech from the common Proto-Indo-European language and the Classical period and they have the same general outline, but differ in some of the detail. The invasion would not be Dorian unless the invaders had some relationship to the historical Dorians. The invasion is known to have displaced population to the later Attic-Ionic regions, the Greeks of this period believed there were three major divisions of all Greek people—Dorians, Aeolians, and Ionians, each with their own defining and distinctive dialects. Often non-west is called East Greek, Arcadocypriot apparently descended more closely from the Mycenaean Greek of the Bronze Age. Boeotian had come under a strong Northwest Greek influence, and can in some respects be considered a transitional dialect, thessalian likewise had come under Northwest Greek influence, though to a lesser degree. Most of the dialect sub-groups listed above had further subdivisions, generally equivalent to a city-state and its surrounding territory, Doric notably had several intermediate divisions as well, into Island Doric, Southern Peloponnesus Doric, and Northern Peloponnesus Doric. The Lesbian dialect was Aeolic Greek and this dialect slowly replaced most of the older dialects, although Doric dialect has survived in the Tsakonian language, which is spoken in the region of modern Sparta. Doric has also passed down its aorist terminations into most verbs of Demotic Greek, by about the 6th century AD, the Koine had slowly metamorphosized into Medieval Greek
4.
Design
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Design is the creation of a plan or convention for the construction of an object, system or measurable human interaction. Design has different connotations in different fields, in some cases, the direct construction of an object is also considered to use design thinking. Designing often necessitates considering the aesthetic, functional, economic, and it may involve considerable research, thought, modeling, interactive adjustment, and re-design. Meanwhile, diverse kinds of objects may be designed, including clothing, graphical user interfaces, skyscrapers, corporate identities, business processes, and even methods or processes of designing. Thus design may be a substantive referring to an abstraction of a created thing or things. It is an act of creativity and innovation, here, a specification can be manifested as either a plan or a finished product, and primitives are the elements from which the design object is composed. With such a broad denotation, there is no language or unifying institution for designers of all disciplines. This allows for many differing philosophies and approaches toward the subject, the person designing is called a designer, which is also a term used for people who work professionally in one of the various design areas usually specifying which area is being dealt with. A designers sequence of activities is called a process while the scientific study of design is called design science. Another definition of design is planning to manufacture an object, system, thus the word design can be used as a noun or a verb. In a broader sense, the design is an applied art, while the definition of design is fairly broad, design has a myriad of specifications that professionals utilize in their fields. Substantial disagreement exists concerning how designers in many fields, whether amateur or professional, alone or in teams, the prevailing view has been called The Rational Model, Technical Problem Solving and The Reason-Centric Perspective. The alternative view has been called Reflection-in-Action, Evolutionary Design, co-evolution, the Rational Model was independently developed by Herbert A. Simon, an American scientist, and Gerhard Pahl and Wolfgang Beitz, two German engineering design theorists. The Rational Model is based on a rationalist philosophy and underlies the waterfall model, systems development life cycle, according to the rationalist philosophy, design is informed by research and knowledge in a predictable and controlled manner. Technical rationality is at the center of the process, each stage has many associated best practices. Unrealistic assumptions – goals are often unknown when a design project begins, the Action-Centric Perspective is a label given to a collection of interrelated concepts, which are antithetical to The Rational Model. Substantial empirical evidence supports the veracity of this perspective in describing the actions of real designers, like the Rational Model, the Action-Centric model sees design as informed by research and knowledge. Designers context-dependent experience and professional judgment take center stage more than technical rationality, at least two views of design activity are consistent with the Action-Centric Perspective
5.
Flight
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Flight is the process by which an object moves, through an atmosphere or beyond it, as in the case of spaceflight. This can be achieved by generating lift, propulsive thrust, aerostatically using buoyancy. Many things fly, from natural aviators such as birds, bats and insects to human inventions such as missiles, aircraft such as airplanes, helicopters and balloons, to rockets such as spacecraft. Humans have managed to construct lighter than air vehicles that raise off the ground and fly, an aerostat is a system that remains aloft primarily through the use of buoyancy to give an aircraft the same overall density as air. Aerostats include free balloons, airships, and moored balloons, an aerostats main structural component is its envelope, a lightweight skin that encloses a volume of lifting gas to provide buoyancy, to which other components are attached. Aerostats are so named because they use aerostatic lift, a buoyant force that does not require movement through the surrounding air mass to effect a lifting force. By contrast, aerodynes primarily use aerodynamic lift, which requires the movement of at least some part of the aircraft through the surrounding air mass. Some things that fly do not generate propulsive thrust through the air, for example, some other things can exploit rising air to climb such as raptors and man-made sailplane gliders. However most other birds and all powered aircraft need a source of propulsion to climb, the only groups of living things that use powered flight are birds, insects, and bats, while many groups have evolved gliding. The extinct Pterosaurs, an order of reptiles contemporaneous with the dinosaurs, were very successful flying animals. Each of these groups wings evolved independently, bats are the only mammals capable of sustaining level flight. Flying frogs use greatly enlarged webbed feet for a similar purpose, flying snakes also use mobile ribs to flatten their body into an aerodynamic shape, with a back and forth motion much the same as they use on the ground. Flying fish can glide using enlarged wing-like fins, and have been observed soaring for hundreds of meters and it is thought that this ability was chosen by natural selection because it was an effective means of escape from underwater predators. The longest recorded flight of a fish was 45 seconds. Most birds fly, with some exceptions, the largest birds, the ostrich and the emu, are earthbound, as were the now-extinct dodos and the Phorusrhacids, which were the dominant predators of South America in the Cenozoic era. The non-flying penguins have wings adapted for use under water and use the same wing movements for swimming that most other birds use for flight, most small flightless birds are native to small islands, and lead a lifestyle where flight would offer little advantage. Among living animals that fly, the wandering albatross has the greatest wingspan, up to 3.5 meters, most species of insects can fly as adults. Insect flight makes use of either of two basic models, creating a leading edge vortex, found in most insects, and using clap and fling
6.
Aircraft
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An aircraft is a machine that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the lift of an airfoil. The human activity that surrounds aircraft is called aviation, crewed aircraft are flown by an onboard pilot, but unmanned aerial vehicles may be remotely controlled or self-controlled by onboard computers. Aircraft may be classified by different criteria, such as type, aircraft propulsion, usage. Each of the two World Wars led to technical advances. Consequently, the history of aircraft can be divided into five eras, Pioneers of flight, first World War,1914 to 1918. Aviation between the World Wars,1918 to 1939, Second World War,1939 to 1945. Postwar era, also called the jet age,1945 to the present day, aerostats use buoyancy to float in the air in much the same way that ships float on the water. They are characterized by one or more large gasbags or canopies, filled with a relatively low-density gas such as helium, hydrogen, or hot air, which is less dense than the surrounding air. When the weight of this is added to the weight of the aircraft structure, a balloon was originally any aerostat, while the term airship was used for large, powered aircraft designs – usually fixed-wing. In 1919 Frederick Handley Page was reported as referring to ships of the air, in the 1930s, large intercontinental flying boats were also sometimes referred to as ships of the air or flying-ships. – though none had yet been built, the advent of powered balloons, called dirigible balloons, and later of rigid hulls allowing a great increase in size, began to change the way these words were used. Huge powered aerostats, characterized by an outer framework and separate aerodynamic skin surrounding the gas bags, were produced. There were still no fixed-wing aircraft or non-rigid balloons large enough to be called airships, then several accidents, such as the Hindenburg disaster in 1937, led to the demise of these airships. Nowadays a balloon is an aerostat and an airship is a powered one. A powered, steerable aerostat is called a dirigible, sometimes this term is applied only to non-rigid balloons, and sometimes dirigible balloon is regarded as the definition of an airship. Non-rigid dirigibles are characterized by a moderately aerodynamic gasbag with stabilizing fins at the back and these soon became known as blimps. During the Second World War, this shape was adopted for tethered balloons, in windy weather
7.
Atmosphere
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An atmosphere is a layer of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is likely to be retained if the gravity it is subject to is high. The atmosphere of Earth is mostly composed of nitrogen, oxygen, argon with carbon dioxide, the atmosphere helps protect living organisms from genetic damage by solar ultraviolet radiation, solar wind and cosmic rays. Its current composition is the product of billions of years of modification of the paleoatmosphere by living organisms. The term stellar atmosphere describes the region of a star. Stars with sufficiently low temperatures may form compound molecules in their outer atmosphere, Atmospheric pressure is the force per unit area that is applied perpendicularly to a surface by the surrounding gas. It is determined by a gravitational force in combination with the total mass of a column of gas above a location. On Earth, units of air pressure are based on the recognized standard atmosphere. It is measured with a barometer, the pressure of an atmospheric gas decreases with altitude due to the diminishing mass of gas above. The height at which the pressure from an atmosphere declines by a factor of e is called the height and is denoted by H. For such an atmosphere, the pressure declines exponentially with increasing altitude. However, atmospheres are not uniform in temperature, so the determination of the atmospheric pressure at any particular altitude is more complex. Surface gravity, the force that holds down an atmosphere, differs significantly among the planets, for example, the large gravitational force of the giant planet Jupiter is able to retain light gases such as hydrogen and helium that escape from objects with lower gravity. Thus, the distant and cold Titan, Triton, and Pluto are able to retain their atmospheres despite their relatively low gravities, rogue planets, theoretically, may also retain thick atmospheres. Since a collection of gas molecules may be moving at a range of velocities. Lighter molecules move faster than ones with the same thermal kinetic energy. It is thought that Venus and Mars may have lost much of their water when, after being photo dissociated into hydrogen and oxygen by solar ultraviolet, Earths magnetic field helps to prevent this, as, normally, the solar wind would greatly enhance the escape of hydrogen. However, over the past 3 billion years Earth may have lost gases through the polar regions due to auroral activity
8.
Royal Aeronautical Society
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The Royal Aeronautical Society, also known as the RAeS, is a British multi-disciplinary professional institution dedicated to the global aerospace community. Founded in 1866, it is the oldest aeronautical society in the world, fellows and Companions of the society can use the post-nominal letters FRAeS or CRAeS, respectively. The Royal Aeronautical Society is a society with an international network of 67 branches. Many practitioners of aerospace disciplines use the Societys designatory post-nominals such as FRAeS, CRAeS, MRAeS, AMRAeS, the RAeS headquarters is located in the United Kingdom. The staff of the Royal Aeronautical Society are based at the Societys headquarters at No.4 Hamilton Place, London, the headquarters is on the north-east edge of Hyde Park Corner, with the nearest access being Hyde Park Corner tube station. They deliver membership benefits and provide a platform for the dissemination of aerospace information. Divisions of the Society have been formed in countries and regions that can sustain a number of Branches, divisions operate with a large degree of autonomy, being responsible for their own branch network, membership recruitment, subscription levels, conference and lecture programmes. Specialist Groups covering all facets of the industry exist under the overall umbrella of the Society. The Groups also act as points for all enquiries to the Society concerning their specialist subject matter. In 2009, the Royal Aeronautical Society formed a group of experts to document how to better simulate aircraft upset conditions, the Society was founded in January 1866 with the name The Aeronautical Society of Great Britain and is the oldest aeronautical society in the world. Early or founding members included James Glaisher, Francis Wenham, the Duke of Argyll, in the first year, there were 65 members, at the end of the second year,91 members, and in the third year,106 members. Annual reports were produced in the first decades, in 1868 the Society held a major exhibition at Londons Crystal Palace with 78 entries. John Stringfellows steam engine was shown there, the Society sponsored the first wind tunnel in 1870-71, designed by Wenham and Browning. In 1918, the name was changed to the Royal Aeronautical Society. In 1940, the RAeS responded to the wartime need to expand the aircraft industry and this technical department became known as the Engineering Sciences Data Unit and eventually became a separate entity in the 1980s. In 1987 the Society of Licensed Aircraft Engineers and Technologists, previously called the Society of Licensed Aircraft Engineers was incorporated into the Royal Aeronautical Society, the following have served as President of the Royal Aeronautical Society, Keith Mans was Chief Executive from 1998-2009. In addition to the award of Fellowship of the Royal Aeronautical Society and these include its Gold, Silver, and Bronze medals. The very first gold medal was awarded in 1909 to the Wright Brothers, Honorary Fellowships and Honorary Companionships are awarded as well
9.
Aviation
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Aviation is the practical aspect or art of aeronautics, being the design, development, production, operation and use of aircraft, especially heavier than air aircraft. The word aviation was coined by French writer and former naval officer Gabriel La Landelle in 1863, from the verb avier, itself derived from the Latin word avis and the suffix -ation. The modern age of aviation began with the first untethered human lighter-than-air flight on November 21,1783, the practicality of balloons was limited because they could only travel downwind. It was immediately recognized that a steerable, or dirigible, balloon was required, jean-Pierre Blanchard flew the first human-powered dirigible in 1784 and crossed the English Channel in one in 1785. Rigid airships became the first aircraft to transport passengers and cargo over great distances, the best known aircraft of this type were manufactured by the German Zeppelin company. The most successful Zeppelin was the Graf Zeppelin and it flew over one million miles, including an around-the-world flight in August 1929. However, the dominance of the Zeppelins over the airplanes of that period, the Golden Age of the airships ended on May 6,1937 when the Hindenburg caught fire, killing 36 people. The cause of the Hindenburg accident was blamed on the use of hydrogen instead of helium as the lift gas. An internal investigation by the manufacturer revealed the coating used to protect the material over the frame was highly flammable. Changes to the coating formulation reduced the risk of further Hindenburg type accidents, although there have been periodic initiatives to revive their use, airships have seen only niche application since that time. In 1799 Sir George Cayley set forth the concept of the airplane as a fixed-wing flying machine with separate systems for lift, propulsion. Seven years later, on 14 October 1897, Aders Avion III was tested without success in front of two officials from the French War ministry, the report on the trials was not publicized until 1910, as they had been a military secret. In November 1906 Ader claimed to have made a flight on 14 October 1897. Although widely believed at the time, these claims were later discredited, however, the most widely accepted date is December 17,1903 by the Wright brothers. The Wright brothers were the first to fly in a powered and controlled aircraft, previous flights were gliders or free flight, but the Wright brothers combined both, setting the new standard in aviation records. Aircraft began to transport people and cargo as designs grew larger, the Wright brothers took aloft the first passenger, Charles Furnas, one of their mechanics, on May 14,1908. By the beginning of World War II, many towns and cities had built airports, the war brought many innovations to aviation, including the first jet aircraft and the first liquid-fueled rockets. Manufacturers such as Cessna, Piper, and Beechcraft expanded production to provide aircraft for the new middle-class market
10.
Airship
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An airship or dirigible balloon is a type of aerostat or lighter-than-air aircraft that can navigate through the air under its own power. Aerostats gain their lift from large gas bags filled with a gas that is less dense than the surrounding air. In early dirigibles, the gas used was hydrogen, due to its high lifting capacity. Helium gas has almost the same lifting capacity and is not flammable, unlike hydrogen, significant amounts were first discovered in the United States and for a while helium was only used for airships by the United States. Most airships built since the 1960s have used helium, though some have used hot air, the envelope of an airship may form a single gas bag, or may contain a number of internal gas-filled cells. An airship also has engines, crew, and optionally also payload accommodation, the main types of airship are non-rigid, semi-rigid, and rigid. Non-rigid airships, often called blimps, rely on internal pressure to maintain the shape of the airship, semi-rigid airships maintain the envelope shape by internal pressure, but have some form of supporting structure, such as a fixed keel, attached to it. Rigid airships have a structural framework which maintains the shape and carries all structural loads. Rigid airships were first flown by Count Zeppelin and the vast majority of rigid airships built were manufactured by the firm he founded, as a result, rigid airships are called zeppelins. S. Navy helium-filled rigids, the USS Akron and USS Macon respectively, during the pioneer years of aeronautics, terms such as airship, air-ship, air ship and ship of the air meant any kind of navigable or dirigible flying machine. In 1919 Frederick Handley Page was reported as referring to ships of the air, in the 1930s, large intercontinental flying boats were also sometimes referred to as ships of the air or flying-ships. Nowadays the term airship is used only for powered, dirigible balloons, semirigid architecture is the more recent and the late appearance is caused by both advancements about deformable structures and exigiency of reducing weight and volume of the airships. They have a structure that ensure to keep the shape jointly with overpressure of the gas envelope. An aerostat is an aircraft which remain aloft using buoyancy or static lift, Airships are a type of aerostat. The term aerostat has also used to indicate a tethered or moored balloon as opposed to a free-floating balloon. A blimp is a non-rigid aerostat, in American usage it refers specifically to a non-rigid type of dirigible balloon or airship. In British usage it refers to any non-rigid aerostat, including balloons and other kite balloons, having a streamlined shape. The initials LZ, for Luftschiff Zeppelin, usually prefixed their crafts serial identifiers, streamlined Parsifal-shaped rigid airships are usually referred to as Zeppelin, because of the fame that this company has acquired due to the number of airships it produced
11.
Ballistics
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A ballistic body is a body with momentum which is free to move, subject to forces, such as the pressure of gases in a gun or a propulsive nozzle, by rifling in a barrel, by gravity, or by air drag. The earliest known ballistic projectiles were stones and spears, and the throwing stick. The oldest evidence of stone-tipped projectiles, which may or may not have been propelled by a bow, dating to c.64,000 years ago, were found in Sibudu Cave, present day-South Africa. The oldest evidence of the use of bows to shoot arrows dates to about 10,000 years ago and they had shallow grooves on the base, indicating that they were shot from a bow. The oldest bow so far recovered is about 8,000 years old, archery seems to have arrived in the Americas with the Arctic small tool tradition, about 4,500 years ago. The first devices identified as guns appeared in China around 1000 AD, and by the 12th century the technology was spreading through the rest of Asia, the word ballistics comes from the Greek βάλλειν ballein, meaning to throw. A projectile is any object projected into space by the exertion of a force, although any object in motion through space is a projectile, the term most commonly refers to a ranged weapon. Mathematical equations of motion are used to analyze projectile trajectory, examples of projectiles include balls, arrows, bullets, artillery shells, rockets, etc. Throwing is the launching of a projectile by hand, although some other animals can throw, humans are unusually good throwers due to their high dexterity and good timing capabilities, and it is believed that this is an evolved trait. Evidence of human throwing dates back 2 million years, the 90 mph throwing speed found in many athletes far exceeds the speed at which chimpanzees can throw things, which is about 20 mph. This ability reflects the ability of the shoulder muscles and tendons to store elasticity until it is needed to propel an object. A sling is a projectile weapon used to throw a blunt projectile such as a stone. A sling has a cradle or pouch in the middle of two lengths of cord. The sling stone is placed in the pouch, the middle finger or thumb is placed through a loop on the end of one cord, and a tab at the end of the other cord is placed between the thumb and forefinger. The sling is swung in an arc, and the tab released at a precise moment and this frees the projectile to fly to the target. A bow is a piece of material which shoots aerodynamic projectiles called arrows. A string joins the two ends and when the string is drawn back, the ends of the stick are flexed, when the string is released, the potential energy of the flexed stick is transformed into the velocity of the arrow. Archery is the art or sport of shooting arrows from bows, a catapult is a device used to launch a projectile a great distance without the aid of explosive devices — particularly various types of ancient and medieval siege engines
12.
Aerodynamics
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Aerodynamics, from Greek ἀήρ aer + δυναμική, the study of the motion of air, particularly its interaction with a solid object, such as an airplane wing. Aerodynamics is a sub-field of fluid dynamics and gas dynamics, the term aerodynamics is often used synonymously with gas dynamics, the difference being that gas dynamics applies to the study of the motion of all gases, and is not limited to air. The formal study of aerodynamics began in the sense in the eighteenth century. Most of the efforts in aerodynamics were directed toward achieving heavier-than-air flight. Recent work in aerodynamics has focused on issues related to flow, turbulence. Fundamental concepts of continuum, drag, and pressure gradients appear in the work of Aristotle, in 1726, Sir Isaac Newton became the first person to develop a theory of air resistance, making him one of the first aerodynamicists. In 1757, Leonhard Euler published the more general Euler equations which could be applied to both compressible and incompressible flows, the Euler equations were extended to incorporate the effects of viscosity in the first half of the 1800s, resulting in the Navier-Stokes equations. The Navier-Stokes equations are the most general governing equations of fluid flow, in 1871, Francis Herbert Wenham constructed the first wind tunnel, allowing precise measurements of aerodynamic forces. Drag theories were developed by Jean le Rond dAlembert, Gustav Kirchhoff, in 1889, Charles Renard, a French aeronautical engineer, became the first person to reasonably predict the power needed for sustained flight. Otto Lilienthal, the first person to become successful with glider flights, was also the first to propose thin, curved airfoils that would produce high lift. Building on these developments as well as carried out in their own wind tunnel. During the time of the first flights, Frederick W. Lanchester, Martin Wilhelm Kutta, Kutta and Zhukovsky went on to develop a two-dimensional wing theory. Expanding upon the work of Lanchester, Ludwig Prandtl is credited with developing the mathematics behind thin-airfoil, as aircraft speed increased, designers began to encounter challenges associated with air compressibility at speeds near or greater than the speed of sound. The differences in air flows under such conditions leds to problems in control, increased drag due to shock waves. The ratio of the speed to the speed of sound was named the Mach number after Ernst Mach who was one of the first to investigate the properties of supersonic flow. Theodore von Kármán and Hugh Latimer Dryden introduced the term transonic to describe flow speeds around Mach 1 where drag increases rapidly, by the time the sound barrier was broken, aerodynamicists understanding of the subsonic and low supersonic flow had matured. The Cold War prompted the design of an line of high performance aircraft. Understanding the motion of air around an object enables the calculation of forces, in many aerodynamics problems, the forces of interest are the fundamental forces of flight, lift, drag, thrust, and weight
13.
Leonardo da Vinci
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He has been variously called the father of palaeontology, ichnology, and architecture, and is widely considered one of the greatest painters of all time. Sometimes credited with the inventions of the parachute, helicopter and tank, many historians and scholars regard Leonardo as the prime exemplar of the Universal Genius or Renaissance Man, an individual of unquenchable curiosity and feverishly inventive imagination. Much of his working life was spent in the service of Ludovico il Moro in Milan. He later worked in Rome, Bologna and Venice, and he spent his last years in France at the home awarded to him by Francis I of France, Leonardo was, and is, renowned primarily as a painter. Among his works, the Mona Lisa is the most famous and most parodied portrait, Leonardos drawing of the Vitruvian Man is also regarded as a cultural icon, being reproduced on items as varied as the euro coin, textbooks, and T-shirts. Perhaps fifteen of his paintings have survived, Leonardo is revered for his technological ingenuity. He conceptualised flying machines, a type of armoured fighting vehicle, concentrated power, an adding machine. Some of his inventions, however, such as an automated bobbin winder. A number of Leonardos most practical inventions are nowadays displayed as working models at the Museum of Vinci. He made substantial discoveries in anatomy, civil engineering, geology, optics, and hydrodynamics, today, Leonardo is widely considered one of the most diversely talented individuals ever to have lived. Leonardo was born on 15 April 1452 at the hour of the night in the Tuscan hill town of Vinci. He was the son of the wealthy Messer Piero Fruosino di Antonio da Vinci, a Florentine legal notary, and Caterina. Leonardo had no surname in the modern sense – da Vinci simply meaning of Vinci, his birth name was Lionardo di ser Piero da Vinci, meaning Leonardo. The inclusion of the title ser indicated that Leonardos father was a gentleman, little is known about Leonardos early life. He spent his first five years in the hamlet of Anchiano in the home of his mother and his father had married a sixteen-year-old girl named Albiera Amadori, who loved Leonardo but died young in 1465 without children. When Leonardo was sixteen, his father married again to twenty-year-old Francesca Lanfredini, pieros legitimate heirs were born from his third wife Margherita di Guglielmo and his fourth and final wife, Lucrezia Cortigiani. Leonardo received an education in Latin, geometry and mathematics. In later life, Leonardo recorded only two childhood incidents, one, which he regarded as an omen, was when a kite dropped from the sky and hovered over his cradle, its tail feathers brushing his face
14.
Marco Polo
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He learned the mercantile trade from his father and uncle, Niccolò and Maffeo, who travelled through Asia and met Kublai Khan. In 1269, they returned to Venice to meet Marco for the first time, the three of them embarked on an epic journey to Asia, returning after 24 years to find Venice at war with Genoa, Marco was imprisoned and dictated his stories to a cellmate. He was released in 1299, became a merchant, married. He died in 1324 and was buried in the church of San Lorenzo in Venice, Marco Polo was not the first European to reach China, but he was the first to leave a detailed chronicle of his experience. This book inspired Christopher Columbus and many other travellers, there is a substantial literature based on Polos writings, he also influenced European cartography, leading to the introduction of the Fra Mauro map. Marco Polo was born in 1254 in Venice Republic and his exact date and place of birth are archivally unknown. Some historians mentioned that he was born on September 15 but that date is not endorsed by mainstream scholarship, Marco Polos birthplace is generally considered Venice, but also varies between Constantinople, and the island of Korčula. There is dispute as to whether the Polo family is of Venetian origin, the first recorded Polo is Venetian Domenico Polo who was mentioned in 971 regarding the prohibition of trade with the Arabs. Later other Polos were also mentioned in the service of the realm, whether they were related with the family of Marco Polo is uncertain, but this could indicate that his ancestors travelled between Venice and Dalmatia. Some of the first indications of where his family originated and were resident come from Venetian documents and manuscripts. Some scholars argued that this account could go along with the note from Il Milione that his father and uncle, Niccolò and Maffeo Polo, the non-Venetian i. e. Sanuto also mentioned a captain from Korčula, Antonio di Polo. Moule cited two early 17th century Venetian manuscripts questi ueneno de dalmatia, Polo questi uene de Dalmatia, scholars etymologically argued that his family name derives from Latin Paulus, the name of a certain bird species, or like Albert tSerstevens considered - from Eastern origin. However, the habitat of the shorebird is non-existent on Korčula, the surname Polo seems related with other widespread Dalmatian surnames. The lack of evidence makes the Korčula theory as a specific birthplace strongly disputed, in 1168, his great-uncle, Marco Polo, borrowed money and commanded a ship in Constantinople. His grandfather, Andrea Polo of the parish of San Felice, had three sons, Maffeo, yet another Marco, and the travellers father Niccolò and this genealogy, described by Ramusio, is not universally accepted as there is no additional evidence to support it. His father, Niccolò Polo, a merchant, traded with the Near East, becoming wealthy, Niccolò and his brother Maffeo set off on a trading voyage before Marcos birth. In 1260, Niccolò and Maffeo, while residing in Constantinople, then the capital of the Latin Empire, foresaw a political change, they liquidated their assets into jewels and moved away. According to The Travels of Marco Polo, they passed through much of Asia, and met with Kublai Khan and their decision to leave Constantinople proved timely
15.
Roger Bacon
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In the early modern era, he was regarded as a wizard and particularly famed for the story of his mechanical or necromantic brazen head. He is sometimes credited as one of the earliest European advocates of the scientific method inspired by Aristotle. His linguistic work has been heralded for its exposition of a universal grammar. However, more recent re-evaluations emphasise that Bacon was essentially a medieval thinker and he was, however, partially responsible for a revision of the medieval university curriculum, which saw the addition of optics to the traditional quadrivium. A survey of how Bacons work was received over the found that it often reflected the concerns. Bacons major work, the Opus Majus, was sent to Pope Clement IV in Rome in 1267 upon the popes request, although gunpowder was first invented and described in China, Bacon was the first in Europe to record its formula. Roger Bacon was born in Ilchester in Somerset, England, in the early 13th century, although his date of birth is sometimes narrowed down to c. 1210,1213 or 1214, however, historians most agree on c. 1220. The only source for his date is a statement from his 1267 Opus Tertium that forty years have passed since I first learned the Alphabetum. His family appears to have been well off, Bacon became a master at Oxford, lecturing on Aristotle. There is no evidence he was awarded a doctorate. A caustic cleric named Roger Bacon is recorded speaking before the king at Oxford in 1233, in 1237 or some time over the next decade, he accepted an invitation to teach at the University of Paris. While there, he lectured on Latin grammar, Aristotelian logic, arithmetic, geometry, and his faculty colleagues included Robert Kilwardby, Albertus Magnus, and Peter of Spain, the future Pope John XXI. The Cornishman Richard Rufus was a scholarly opponent, in 1247 or soon after, he left his position in Paris. As a private scholar, his whereabouts for the decade are uncertain but he was likely in Oxford c. 1248–51, where he met Adam Marsh. He seems to have studied most of the known Greek and Arabic works on optics, a passage in the Opus Tertium states that at some point he took a two-year break from his studies. Pope Urban IV absolved the king of his oath in 1261 and, after an initial abortive resistance, Bacons own family were considered royal partisans, De Montforts men seized their property and drove several members into exile. In 1256 or 57, he became a friar in the Franciscan Order in either Paris or Oxford, following the example of scholarly English Franciscans such as Grosseteste and Marsh. After 1260, Bacons activities were restricted by a statute prohibiting the friars of his order from publishing books or pamphlets without prior approval
16.
Balloon (aeronautics)
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In aeronautics, a balloon is an unpowered aerostat, which remains aloft or floats due to its buoyancy. A balloon may be free, moving with the wind, or tethered to a fixed point and it is distinct from an airship, which is a powered aerostat that can propel itself through the air in a controlled manner. Many balloons have a basket, gondola or capsule suspended beneath the envelope for carrying people or equipment. A balloon is conceptually the simplest of all flying machines, the balloon is a fabric envelope filled with a gas that is lighter than the surrounding atmosphere. As the entire balloon is less dense than its surroundings, it rises, taking along with it a basket, attached underneath, which carries passengers or payload. Although a balloon has no propulsion system, a degree of control is possible through making the balloon rise or sink in altitude to find favorable wind directions. There are three types of balloon, The hot air balloon or Montgolfière obtains its buoyancy by heating the air inside the balloon. The Rozière type has both heated and unheated lifting gases in separate gasbags and this type of balloon is sometimes used for long-distance record flights, such as the recent circumnavigations, but is not otherwise in use. Both the hot air, or Montgolfière, balloon and the gas balloon are still in common use, Montgolfière balloons are relatively inexpensive, as they do not require high-grade materials for their envelopes, and they are popular for balloonist sport activity. The first tethered manned balloon flight was by a larger Montgolfier balloon, the first free balloon flight was by the same Montgolfier balloon on 21 November 1783. When heated, air expands, so a given volume of space contains less air and this makes it lighter and, if its lifting power is greater than the weight of the balloon containing it, it will lift the balloon upwards. A hot air balloon can stay up while it has fuel for its burner. The Montgolfiers early hot air balloons used a solid-fuel brazier which proved less practical than the balloons that had followed almost immediately. In the 1950s, the convenience and low cost of bottled gas burners led to a revival of hot air ballooning for sport and leisure. A man-carrying balloon using the gas hydrogen for buoyancy was made by Professor Jacques Charles and flown less than a month after the Montgolfier flight. In the 19th century, it was common to use gas to fill balloons, this was not as light as pure hydrogen gas, having about half the lifting power. Light gas balloons are predominant in scientific applications, as they are capable of reaching much higher altitudes for longer periods of time. They are generally filled with helium, although hydrogen has more lifting power, it is explosive in an atmosphere rich in oxygen
17.
Ornithopter
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An ornithopter is an aircraft that flies by flapping its wings. Designers seek to imitate the flight of birds, bats. Though machines may differ in form, they are built on the same scale as these flying creatures. Manned ornithopters have also built, and some have been successful. The machines are of two types, those with engines, and those powered by the muscles of the pilot. Some early manned flight attempts may have intended to achieve flapping-wing flight. These include the flights of the 11th-century monk Eilmer of Malmesbury. Roger Bacon, writing in 1260, was also among the first to consider a means of flight. In 1485, Leonardo da Vinci began to study the flight of birds and he grasped that humans are too heavy, and not strong enough, to fly using wings simply attached to the arms. He therefore sketched a device in which the aviator lies down on a plank, in 1841, an ironsmith kalfa Manojlo who came to Belgrade from Vojvodina attempted flying with a device described as an ornithopter. The first ornithopters capable of flight were constructed in France, jobert in 1871 used a rubber band to power a small model bird. Alphonse Pénaud, Abel Hureau de Villeneuve, and Victor Tatin, tatins ornithopter was perhaps the first to use active torsion of the wings, and apparently it served as the basis for a commercial toy offered by Pichancourt circa 1889. Gustave Trouvé was the first to use internal combustion, and his 1890 model flew a distance of 80 metres in a demonstration for the French Academy of Sciences, the wings were flapped by gunpowder charges activating a Bourdon tube. From 1884 on, Lawrence Hargrave built scores of ornithopters powered by rubber bands, springs, steam and he introduced the use of small flapping wings providing the thrust for a larger fixed wing, this innovation eliminated the need for gear reduction, thereby simplifying the construction. Frost made ornithopters starting in the 1870s, first models were powered by engines, then in the 1900s. Erich von Holst, also working in the 1930s, achieved great efficiency, in 1961, Percival Spencer and Jack Stephenson flew the first successful engine-powered, remotely piloted ornithopter, known as the Spencer Orniplane. The Orniplane had a 90. 7-inch wingspan, weighed 7.5 pounds and it had a biplane configuration, to reduce oscillation of the fuselage. Manned ornithopters fall into two categories, Those powered by the muscular effort of the pilot, and those powered by an engine
18.
Helicopter
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A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and these attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL aircraft cannot perform. English language nicknames for helicopter include chopper, copter, helo, heli, Helicopters were developed and built during the first half-century of flight, with the Focke-Wulf Fw 61 being the first operational helicopter in 1936. Some helicopters reached limited production, but it was not until 1942 that a helicopter designed by Igor Sikorsky reached full-scale production, with 131 aircraft built. Though most earlier designs used more than one rotor, it is the single main rotor with anti-torque tail rotor configuration that has become the most common helicopter configuration. Tandem rotor helicopters are also in use due to their greater payload capacity. Coaxial helicopters, tiltrotor aircraft, and compound helicopters are all flying today, quadcopter helicopters pioneered as early as 1907 in France, and other types of multicopter have been developed for specialized applications such as unmanned drones. The earliest references for vertical flight came from China, since around 400 BC, Chinese children have played with bamboo flying toys. This bamboo-copter is spun by rolling a stick attached to a rotor, the spinning creates lift, and the toy flies when released. The 4th-century AD Daoist book Baopuzi by Ge Hong reportedly describes some of the ideas inherent to rotary wing aircraft, designs similar to the Chinese helicopter toy appeared in Renaissance paintings and other works. In the 18th and early 19th centuries Western scientists developed flying machines based on the Chinese toy. It was not until the early 1480s, when Leonardo da Vinci created a design for a machine that could be described as an aerial screw, that any recorded advancement was made towards vertical flight. His notes suggested that he built flying models, but there were no indications for any provision to stop the rotor from making the craft rotate. As scientific knowledge increased and became accepted, people continued to pursue the idea of vertical flight. In July 1754, Russian Mikhail Lomonosov had developed a small coaxial modeled after the Chinese top but powered by a spring device. It was powered by a spring, and was suggested as a method to lift meteorological instruments. Sir George Cayley, influenced by a fascination with the Chinese flying top, developed a model of feathers, similar to that of Launoy and Bienvenu. By the end of the century, he had progressed to using sheets of tin for rotor blades and his writings on his experiments and models would become influential on future aviation pioneers
19.
Isaac Newton
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His book Philosophiæ Naturalis Principia Mathematica, first published in 1687, laid the foundations of classical mechanics. Newton also made contributions to optics, and he shares credit with Gottfried Wilhelm Leibniz for developing the infinitesimal calculus. Newtons Principia formulated the laws of motion and universal gravitation that dominated scientists view of the universe for the next three centuries. Newtons work on light was collected in his influential book Opticks. He also formulated a law of cooling, made the first theoretical calculation of the speed of sound. Newton was a fellow of Trinity College and the second Lucasian Professor of Mathematics at the University of Cambridge, politically and personally tied to the Whig party, Newton served two brief terms as Member of Parliament for the University of Cambridge, in 1689–90 and 1701–02. He was knighted by Queen Anne in 1705 and he spent the last three decades of his life in London, serving as Warden and Master of the Royal Mint and his father, also named Isaac Newton, had died three months before. Born prematurely, he was a child, his mother Hannah Ayscough reportedly said that he could have fit inside a quart mug. When Newton was three, his mother remarried and went to live with her new husband, the Reverend Barnabas Smith, leaving her son in the care of his maternal grandmother, Newtons mother had three children from her second marriage. From the age of twelve until he was seventeen, Newton was educated at The Kings School, Grantham which taught Latin and Greek. He was removed from school, and by October 1659, he was to be found at Woolsthorpe-by-Colsterworth, Henry Stokes, master at the Kings School, persuaded his mother to send him back to school so that he might complete his education. Motivated partly by a desire for revenge against a bully, he became the top-ranked student. In June 1661, he was admitted to Trinity College, Cambridge and he started as a subsizar—paying his way by performing valets duties—until he was awarded a scholarship in 1664, which guaranteed him four more years until he would get his M. A. He set down in his notebook a series of Quaestiones about mechanical philosophy as he found it, in 1665, he discovered the generalised binomial theorem and began to develop a mathematical theory that later became calculus. Soon after Newton had obtained his B. A. degree in August 1665, in April 1667, he returned to Cambridge and in October was elected as a fellow of Trinity. Fellows were required to become ordained priests, although this was not enforced in the restoration years, however, by 1675 the issue could not be avoided and by then his unconventional views stood in the way. Nevertheless, Newton managed to avoid it by means of a special permission from Charles II. A and he was elected a Fellow of the Royal Society in 1672. Newtons work has been said to distinctly advance every branch of mathematics then studied and his work on the subject usually referred to as fluxions or calculus, seen in a manuscript of October 1666, is now published among Newtons mathematical papers
20.
Newton's laws of motion
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Newtons laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. More precisely, the first law defines the force qualitatively, the second law offers a measure of the force. These three laws have been expressed in different ways, over nearly three centuries, and can be summarised as follows. The three laws of motion were first compiled by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica, Newton used them to explain and investigate the motion of many physical objects and systems. For example, in the volume of the text, Newton showed that these laws of motion, combined with his law of universal gravitation. Newtons laws are applied to objects which are idealised as single point masses, in the sense that the size and this can be done when the object is small compared to the distances involved in its analysis, or the deformation and rotation of the body are of no importance. In this way, even a planet can be idealised as a particle for analysis of its orbital motion around a star, in their original form, Newtons laws of motion are not adequate to characterise the motion of rigid bodies and deformable bodies. Leonhard Euler in 1750 introduced a generalisation of Newtons laws of motion for rigid bodies called Eulers laws of motion, if a body is represented as an assemblage of discrete particles, each governed by Newtons laws of motion, then Eulers laws can be derived from Newtons laws. Eulers laws can, however, be taken as axioms describing the laws of motion for extended bodies, Newtons laws hold only with respect to a certain set of frames of reference called Newtonian or inertial reference frames. Other authors do treat the first law as a corollary of the second, the explicit concept of an inertial frame of reference was not developed until long after Newtons death. In the given mass, acceleration, momentum, and force are assumed to be externally defined quantities. This is the most common, but not the interpretation of the way one can consider the laws to be a definition of these quantities. Newtonian mechanics has been superseded by special relativity, but it is useful as an approximation when the speeds involved are much slower than the speed of light. The first law states that if the net force is zero, the first law can be stated mathematically when the mass is a non-zero constant, as, ∑ F =0 ⇔ d v d t =0. Consequently, An object that is at rest will stay at rest unless a force acts upon it, an object that is in motion will not change its velocity unless a force acts upon it. This is known as uniform motion, an object continues to do whatever it happens to be doing unless a force is exerted upon it. If it is at rest, it continues in a state of rest, if an object is moving, it continues to move without turning or changing its speed
21.
George Cayley
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Sir George Cayley, 6th Baronet was a prolific English engineer and is one of the most important people in the history of aeronautics. Many consider him to be the first true scientific aerial investigator, in 1799 he set forth the concept of the modern aeroplane as a fixed-wing flying machine with separate systems for lift, propulsion, and control. He was a pioneer of engineering and is sometimes referred to as the father of aviation. He discovered and identified the four forces which act on a flying vehicle, weight, lift, drag. Modern aeroplane design is based on discoveries and on the importance of cambered wings. He constructed the first flying model aeroplane and also diagrammed the elements of vertical flight and he designed the first glider reliably reported to carry a human aloft. He correctly predicted that sustained flight would not occur until an engine was developed to provide adequate thrust. The Wright brothers acknowledged his importance to the development of aviation and he was a founding member of the British Association for the Advancement of Science and was a distant cousin of the mathematician Arthur Cayley. Cayley, from Brompton-by-Sawdon, near Scarborough in Yorkshire, inherited Brompton Hall and Wydale Hall and other estates on the death of his father, captured by the optimism of the times, he engaged in a wide variety of engineering projects. He suggested that a practical engine might be made using gaseous vapours rather than gunpowder. He is mainly remembered for his studies and experiments with flying machines, including the working, piloted glider that he designed. He wrote a landmark three-part treatise titled On Aerial Navigation, which was published in Nicholsons Journal of Natural Philosophy, Chemistry, the 2007 discovery of sketches in Cayleys school notebooks revealed that even at school Cayley was developing his ideas on the theories of flight. It has been claimed that these images indicate that Cayley identified the principle of an inclined plane as early as 1792. To measure the drag on objects at different speeds and angles of attack, he built a whirling-arm apparatus. He also experimented with rotating wing sections of various forms in the stairwells at Brompton Hall and these scientific experiments led him to develop an efficient cambered airfoil and to identify the four vector forces that influence an aircraft, thrust, lift, drag, and gravity. As a result of his investigations into many other aspects of flight. His emphasis on lightness led him to invent a new method of constructing lightweight wheels which is in use today. For his landing wheels, he shifted the forces from compression to tension by making them from tightly-stretched string
22.
History of ballooning
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The history of ballooning, both with hot air and gas, spans many centuries. It includes many firsts, including the first human flight, first flight across the English Channel, first flight in North America, unmanned hot air balloons are popular in Chinese history. Zhuge Liang of the Shu Han kingdom, in the Three Kingdoms era used airborne lanterns for military signaling and these lanterns are known as Kongming lanterns. It has been demonstrated that hot air balloons can be built using ancient materials. The Mongolian army studied Kongming lanterns from China and used them in the Battle of Legnica during the Mongol invasion of Poland and this is the first time ballooning was known in the western world. The first documented balloon flight in Europe was by the Brazilian-Portuguese priest Bartolomeu de Gusmão. On August 8,1709, in Lisbon, Bartolomeu de Gusmão managed to lift a balloon made of paper full of hot air about four meters in front of king John V. According to the Portuguese speaking community, this was the earliest recorded model balloon flight. Jacques Charles, whose study of gases led to his law of volumes, had studied the works of Cavendish, Black, and Tiberius Cavallo. Jacques Charles designed the balloon, and the Robert brothers constructed a lightweight, airtight gas bag, barthélémy Faujas de Saint-Fond organized a crowd-funded subscription to finance the brothers project. The Roberts dissolved rubber in a solution of turpentine, with which they varnished stitched-together sheets of silk and they used alternating strips of red and white silk, but the rubberising varnish yellowed the white silk. Jacques Charles and the Robert brothers began filling the worlds first hydrogen balloon on the 23rd of August 1783, in the Place des Victoires, the balloon was comparatively small, a 35 cubic metre sphere of rubberised silk, and only capable of lifting about 9 kg. It was filled with hydrogen that had made by pouring nearly a quarter of a tonne of sulphuric acid onto half a tonne of scrap iron. On August 27,1783, the balloon was released, Benjamin Franklin was among the crowd of onlookers, the sheep was believed to have a reasonable approximation of human physiology. The duck was expected to be unharmed by being lifted aloft and it was included as a control for effects created by the aircraft rather than the altitude. The rooster was included as a control as it was a bird that did not fly at high altitudes. This demonstration was performed before a crowd at the palace in Versailles, before King Louis XVI of France. The flight lasted approximately eight minutes, covered two miles, and obtained an altitude of about 1,500 feet, the craft landed safely after flying
23.
Galileo Galilei
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Galileo Galilei was an Italian polymath, astronomer, physicist, engineer, philosopher, and mathematician. He played a role in the scientific revolution of the seventeenth century. Galileo also worked in applied science and technology, inventing an improved military compass, Galileos championing of heliocentrism and Copernicanism was controversial during his lifetime, when most subscribed to either geocentrism or the Tychonic system. He met with opposition from astronomers, who doubted heliocentrism because of the absence of a stellar parallax. He was tried by the Inquisition, found vehemently suspect of heresy and he spent the rest of his life under house arrest. He has been called the father of observational astronomy, the father of modern physics, the father of scientific method, and the father of science. Galileo was born in Pisa, Italy, on 15 February 1564, the first of six children of Vincenzo Galilei, a famous lutenist, composer, and music theorist, and Giulia, three of Galileos five siblings survived infancy. The youngest, Michelangelo, also became a noted lutenist and composer although he contributed to financial burdens during Galileos young adulthood, Michelangelo was unable to contribute his fair share of their fathers promised dowries to their brothers-in-law, who would later attempt to seek legal remedies for payments due. Michelangelo would also occasionally have to borrow funds from Galileo to support his musical endeavours and these financial burdens may have contributed to Galileos early fire to develop inventions that would bring him additional income. When Galileo Galilei was eight, his family moved to Florence and he then was educated in the Vallombrosa Abbey, about 30 km southeast of Florence. Galileo Bonaiuti was buried in the church, the Basilica of Santa Croce in Florence. It was common for mid-sixteenth century Tuscan families to name the eldest son after the parents surname, hence, Galileo Galilei was not necessarily named after his ancestor Galileo Bonaiuti. The Italian male given name Galileo derives from the Latin Galilaeus, meaning of Galilee, the biblical roots of Galileos name and surname were to become the subject of a famous pun. In 1614, during the Galileo affair, one of Galileos opponents, in it he made a point of quoting Acts 1,11, Ye men of Galilee, why stand ye gazing up into heaven. Despite being a genuinely pious Roman Catholic, Galileo fathered three children out of wedlock with Marina Gamba and they had two daughters, Virginia and Livia, and a son, Vincenzo. Their only worthy alternative was the religious life, both girls were accepted by the convent of San Matteo in Arcetri and remained there for the rest of their lives. Virginia took the name Maria Celeste upon entering the convent and she died on 2 April 1634, and is buried with Galileo at the Basilica of Santa Croce, Florence. Livia took the name Sister Arcangela and was ill for most of her life, Vincenzo was later legitimised as the legal heir of Galileo and married Sestilia Bocchineri
24.
Cyrano de Bergerac
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Savinien de Cyrano de Bergerac was a French novelist, playwright, epistolarian and duelist. A bold and innovative author, his work was part of the literature of the first half of the seventeenth century. Today he is best known as the inspiration for Edmond Rostands most noted drama Cyrano de Bergerac which, although it includes elements of his life, also contains invention and myth. Since the 1970s, there has been a resurgence in the study of Cyrano, demonstrated in the abundance of theses, essays, articles and biographies published in France, Cyranos short life is poorly documented. His paternal grandfather, Savinien I de Cyrano, was born into a notable family from Sens in Burgundy. Documents describe him in turn as a merchant and burgher of Paris, fish merchant to the King in several documents in following years. In Paris, on 9 April 1551, he married Anne Le Maire, daughter of Estienne Le Maire and Perrette Cardon and they are known to have had four children, Abel, Samuel, Pierre and Anne. Of his maternal grandfather, Estienne Bellanger, Financial Controller of the Parisian general revenue, Espérance Bellanger and Abel I de Cyrano were married on 3 September 1612 at the church of St-Gervais-et-St-Protais. She was at least twenty-six years old, he was about forty-five, in 1911 Jean Lemoine made known the inventory of Abel de Cyranos worldly goods. On the religious side, one notices the presence of two Bibles, of an Italian New Testament and the Prayers of St. Basil in Greek, but no pious works. Espérance and Abel I had at least six children, Denis, baptised at the church of Saint-Eustache on 31 March 1614 by Anne Le Maire, his grandmother, and Denis Feydeau, financier. Died at an age, Honoré, baptized at Saint-Eustache on 3 July 1617 by Honoré Barentin, trésorier des parties casuelles. Thus Espérance Bellanger was thirty-three years old, Abel de Cyrano around fifty-two, the surname Fanny appears nowhere in the very complete study of La Chambre des comptes de Paris published by Count H. Coustant dYanville in 1875. In 1898, Viscount Oscar de Poli suggested that it must have been a transcription error and his wife, Catherine Vigor, associate of Vincent de Paul, would become President of the Confrérie de la Charité de Gentilly where the couple set up a mission in 1634. She could well be the godmother of Catherine de Cyrano and it was in this rustic setting that the child grew up and in the neighbouring parish he learnt to read and write. It is unknown at what age Savinien arrived in Paris and he may have been accommodated by his uncle Samuel de Cyrano in a large family residence in the Rue des Prouvaires, where his parents had lived up until 1618. In this theory, it was there that he was introduced to his cousin Pierre, with whom, according to Le Bret and he continued his secondary studies at an academy which remains unknown. But there is no certainty that Savinien went to live with them, as an example of the romantic imagination of some biographers, Frédéric Lachèvre wrote, Against an embittered and discontented father, Cyrano promptly forgot the way to his fathers house
25.
Francesco Lana de Terzi
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Francesco Lana de Terzi was an Italian Jesuit priest, mathematician, naturalist and aeronautics pioneer. He also developed the idea developed into Braille. Encouraged by the experiments of Otto von Guericke with the Magdeburg hemispheres, the airship would be steered like a sailing boat. Each sphere would have had a diameter of 7.5 m, Terzi calculated that the weight of a sphere would be 180 kg. He also calculated that the air in the sphere would weigh 290 kg, at the time no one could manufacture such thin copper foil and the pressure of the surrounding air would have collapsed the spheres. In addition, Francesco Lana de Terzi was aware that one could use such a vehicle as a weapon of war, and attack cities from air. He wrote, “God will never allow that such a machine be built…because everybody realises that no city would be safe from raids…iron weights, fireballs and bombs could be hurled from a great height. The fact that these spheres were physically impossible was proven in 1710 by Gottfried William Leibniz. Although Leibnizs conclusion was based on the materials known at the time. A model of Lana de Terzis invention is on display at the Smithsonian National Air and Space Museum in Washington, in his book Prodromo he also introduced an entirely new alphabet for blind people of his own invention. The one detail which prevented the success of this invention is that Lana failed to understand that dots were more easily recognizable than dashes by the touch, louis Braille made this fundamental intuition and devised the blind writing alphabet that was named after him. List of Roman Catholic scientist-clerics Biography in the Catholic Encyclopedia Eug, how I would rewrite article on Lana in Wikipedia
26.
Montgolfier brothers
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Joseph-Michel Montgolfier and Jacques-Étienne Montgolfier were the inventors of the Montgolfière-style hot air balloon, globe aérostatique. The brothers succeeded in launching the first piloted ascent, carrying Étienne into the sky, later, in December 1783, in recognition of their achievement, their father Pierre was elevated to the nobility and the hereditary appellation of de Montgolfier by King Louis XVI of France. Both of them were freemasons in Les Neuf Soeurs lodge in Paris, the brothers were born into a family of paper manufacturers in Annonay, in Ardèche, France. Their parents were Pierre Montgolfier and his wife, Anne Duret, Pierre established his eldest son, Raymond Montgolfier, later Raymond de Montgolfier, as his successor. Joseph, the 12th child, possessed a typical inventors temperament—a maverick and dreamer, Étienne had a much more even and businesslike temperament. As the 15th child, and particularly troublesome to his elder siblings, however, after the sudden and unexpected death of Raymond in 1772, he was recalled to Annonay to run the family business. In the subsequent 10 years, Étienne applied his talent for technical innovation to the family business and he succeeded in incorporating the latest Dutch innovations of the day into the family mills. Of the two brothers, it was Joseph who first contemplated building machines as early as 1782 when he observed laundry drying over a fire incidentally form pockets that billowed upwards, Joseph made his first definitive experiments in November 1782 while living in the city of Avignon. Joseph mused on the possibility of an air assault using troops lifted by the force that was lifting the embers from the fire. He believed that contained within the smoke was a special gas, as a result of these musings, Joseph set about building a box-like chamber 1×1×1.3 m out of very thin wood, and covering the sides and top with lightweight taffeta cloth. He crumpled and lit some paper under the bottom of the box, the contraption quickly lifted off its stand and collided with the ceiling. Joseph then recruited his brother to balloon building by writing, Get in a supply of taffeta and of cordage, quickly, the two brothers then set about building a similar device, scaled up by three. The lifting force was so great that they lost control of their craft on its very first test flight on 14 December 1782, the device floated nearly two kilometers. It was destroyed after landing by the indiscretion of passersby, the brothers decided to make a public demonstration of a balloon to establish their claim to its invention. They constructed a balloon of sackcloth with three thin layers of paper inside. The envelope could contain nearly 790 m³ of air and weighed 225 kg and it was constructed of four pieces and held together by 1,800 buttons. A reinforcing fish net of cord covered the outside of the envelope, on 4 June 1783, they flew this craft as their first public demonstration at Annonay in front of a group of dignitaries from the États particuliers. Its flight covered 2 km, lasted 10 minutes, and had an altitude of 1
27.
Hydrogen
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Hydrogen is a chemical element with chemical symbol H and atomic number 1. With a standard weight of circa 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form is the most abundant chemical substance in the Universe, non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed protium, has one proton, the universal emergence of atomic hydrogen first occurred during the recombination epoch. At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, since hydrogen readily forms covalent compounds with most nonmetallic elements, most of the hydrogen on Earth exists in molecular forms such as water or organic compounds. Hydrogen plays an important role in acid–base reactions because most acid-base reactions involve the exchange of protons between soluble molecules. In ionic compounds, hydrogen can take the form of a charge when it is known as a hydride. The hydrogen cation is written as though composed of a bare proton, Hydrogen gas was first artificially produced in the early 16th century by the reaction of acids on metals. Industrial production is mainly from steam reforming natural gas, and less often from more energy-intensive methods such as the electrolysis of water. Most hydrogen is used near the site of its production, the two largest uses being fossil fuel processing and ammonia production, mostly for the fertilizer market, Hydrogen is a concern in metallurgy as it can embrittle many metals, complicating the design of pipelines and storage tanks. Hydrogen gas is flammable and will burn in air at a very wide range of concentrations between 4% and 75% by volume. The enthalpy of combustion is −286 kJ/mol,2 H2 + O2 →2 H2O +572 kJ Hydrogen gas forms explosive mixtures with air in concentrations from 4–74%, the explosive reactions may be triggered by spark, heat, or sunlight. The hydrogen autoignition temperature, the temperature of spontaneous ignition in air, is 500 °C, the detection of a burning hydrogen leak may require a flame detector, such leaks can be very dangerous. Hydrogen flames in other conditions are blue, resembling blue natural gas flames, the destruction of the Hindenburg airship was a notorious example of hydrogen combustion and the cause is still debated. The visible orange flames in that incident were the result of a mixture of hydrogen to oxygen combined with carbon compounds from the airship skin. H2 reacts with every oxidizing element, the ground state energy level of the electron in a hydrogen atom is −13.6 eV, which is equivalent to an ultraviolet photon of roughly 91 nm wavelength. The energy levels of hydrogen can be calculated fairly accurately using the Bohr model of the atom, however, the atomic electron and proton are held together by electromagnetic force, while planets and celestial objects are held by gravity. The most complicated treatments allow for the effects of special relativity
28.
Joseph Black
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Joseph Black FRSE FRCPE FPSG was a Scottish physician and chemist, known for his discoveries of magnesium, latent heat, specific heat, and carbon dioxide. The chemistry buildings at both the University of Edinburgh and the University of Glasgow are named after Black, Black was born in Bordeaux, France, where his father, who was from Belfast, Ireland, was engaged in the wine trade. His mother was from Aberdeenshire, Scotland, and her family was also in the wine business, Joseph had twelve brothers and sisters. During his studies he wrote a thesis on the treatment of kidney stones with the salt magnesium carbonate. Like most eighteenth-century experimentalists, Blacks conceptualisation of chemistry was based on five principles of matter, Water, Salt, Earth, Fire and he added the principle of Air when his experiments definitely confirmed the presence of carbon dioxide. Blacks research programme was guided by questions relating to how the foregoing principles combined with other in various different forms. He used the term affinity to describe the force that held such combinations together, throughout his career he used a variety of diagrams and formulas to teach his Edinburgh students how to manipulate affinity through different kinds of experimentation. In about 1750, while still a student, Black developed the analytical balance based on a beam balanced on a wedge-shaped fulcrum. Each arm carried a pan on which the sample or standard weights was placed and it far exceeded the accuracy of any other balance of the time and became an important scientific instrument in most chemistry laboratories. In 1757, Black was appointed Regius Professor of the Practice of Medicine at the University of Glasgow. Additionally, Black observed that the application of heat to boiling water does not result in a rise in temperature of a water/steam mixture, from these observations, he concluded that the heat applied must have combined with the ice particles and boiling water and become latent. The theory of latent heat marks the beginning of thermodynamics, Blacks theory of latent heat was one of his more-important scientific contributions, and one on which his scientific fame chiefly rests. He also showed that different substances have different specific heats, the theory ultimately proved important not only in the development of abstract science but in the development of the steam engine. The latent heat of water is large compared with other liquids. Black and Watt became friends after meeting around 1757 while both were at Glasgow, Black provided significant financing and other support for Watts early research in steam power. Black also explored the properties of a gas produced in various reactions and he found that limestone could be heated or treated with acids to yield a gas he called fixed air. He observed that the air was denser than air and did not support either flame or animal life. Black also found that when bubbled through a solution of lime
29.
Jacques Charles
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Jacques Alexandre César Charles was a French inventor, scientist, mathematician, and balloonist. He was sometimes called Charles the Geometer and their pioneering use of hydrogen for lift led to this type of balloon being named a Charlière. Charless law, describing how gases tend to expand when heated, was formulated by Joseph Louis Gay-Lussac in 1802, Charles was elected to the Académie des Sciences in 1795 and subsequently became professor of physics at the Académie de Sciences. Charles was born in Beaugency-sur-Loire in 1746, He married Julie Françoise Bouchaud des Hérettes, Charles outlived her and died in Paris on April 7,1823. They used alternate strips of red and white silk, but the discolouration of the process left a red. Jacques Charles and the Robert brothers launched the worlds first hydrogen filled balloon on August 27,1783, from the Champ de Mars, the balloon was comparatively small, a 35 cubic metre sphere of rubberised silk, and only capable of lifting about 9 kg. It was filled with hydrogen that had made by pouring nearly a quarter of a tonne of sulphuric acid onto a half a tonne of scrap iron. The hydrogen gas was fed into the balloon via lead pipes, daily progress bulletins were issued on the inflation, and the crowd was so great that on the 26th the balloon was moved secretly by night to the Champ de Mars, a distance of 4 kilometres. The project was funded by a subscription organised by Barthelemy Faujas de Saint-Fond, at 13,45 on December 1,1783 Jacques Charles and the Robert brothers launched a new manned balloon from the Jardin des Tuileries in Paris. Jacques Charles was accompanied by Nicolas-Louis Robert as co-pilot of the 380-cubic-metre, the envelope was fitted with a hydrogen release valve and was covered with a net from which the basket was suspended. Sand ballast was used to control altitude and they ascended to a height of about 1,800 feet and landed at sunset in Nesles-la-Vallée after a 2-hour 5 minute flight covering 36 km. The chasers on horseback, who were led by the Duc de Chartres, Jacques Charles then decided to ascend again, but alone this time because the balloon had lost some of its hydrogen. This time it ascended rapidly to an altitude of about 3,000 metres and he began suffering from aching pain in his ears so he valved to release gas, and descended to land gently about 3 km away at Tour du Lay. Unlike the Robert brothers, Charles never flew again, although a hydrogen balloon came to be called a Charlière in his honour, among the special enclosure crowd was Benjamin Franklin, the diplomatic representative of the United States of America. Also present was Joseph Montgolfier, whom Charles honoured by asking him to release the small, bright green, pilot balloon to assess the wind and weather conditions. This event took place ten days after the worlds first manned flight by Jean-François Pilâtre de Rozier using a Montgolfier brothers hot air balloon. Simon Schama wrote in Citizens, Montgolfiers principal scientific collaborator was M. Charles, who had been the first to propose the gas produced by vitriol instead of the burning, dampened straw and wood that he had used in earlier flights. Charles himself was eager to ascend but had run into a firm veto from the King
30.
Robert brothers
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For the inventor of the Fourdrinier paper manufacturing machine, see Louis-Nicolas Robert. For the 17th Century French miniaturist and engraver, see Nicolas Robert, les Frères Robert were two French brothers. Anne-Jean Robert and Nicolas-Louis Robert were the engineers who built the worlds first hydrogen balloon for professor Jacques Charles and they went on to build the worlds first manned hydrogen balloon, and on 1 December 1783 Nicolas-Louis accompanied Jacques Charles on a 2-hour, 5-minute flight. Their barometer and thermometer made it the first balloon flight to provide measurements of the atmosphere above the Earths surface. The brothers subsequently experimented with an elliptical shape for the hydrogen envelope in a balloon they attempted to power and steer by means of oars. In September 1784 the brothers flew 186 km from Paris to Beuvry, the Robert brothers were skilled engineers with a workshop at the Place des Victoires in Paris, who worked with professor Jacques Charles to build the first usable hydrogen balloon in 1783. Jacques Charles designed the balloon and the Robert brothers invented the methodology for constructing the lightweight, airtight gas bag. They dissolved rubber in a solution of turpentine and varnished the sheets of silk that were stitched together to make the main envelope and they used alternate strips of red and white silk, but the discolouration of the varnishing/rubberising process left a red and yellow result. The balloon was comparatively small, a 35 cubic-metre sphere of rubberised silk and it was filled with hydrogen that had been made by pouring nearly a quarter of a tonne of sulphuric acid onto half a tonne of scrap iron. The hydrogen gas was fed into the envelope through lead pipes, daily progress bulletins were issued on the inflation, and the crowd was so great that on the 26th the balloon was moved secretly by night to the Champ-de-Mars, a distance of 4 kilometres. The project was funded by a subscription organised by Barthélemy Faujas de Saint-Fond, at 13,45 on December 1,1783, Professor Jacques Charles and the Robert brothers launched a new manned balloon from the Jardin des Tuileries in Paris, amid vast crowds and excitement. Jacques Charles was accompanied by Nicolas-Louis Robert as co-pilot of the 380-cubic-metre, hydrogen-filled, the envelope was fitted with a hydrogen release valve and was covered with a net from which the basket was suspended. Sand ballast was used to control altitude and they ascended to a height of about 1,800 feet and landed at sunset in Nesles-la-Vallée after a 2-hour, 5-minute flight covering 36 km. The chasers on horseback, who were led by the Duc de Chartres, Jacques Charles then decided to ascend again, but alone this time because the balloon had lost some of its hydrogen. The balloon ascended rapidly to an altitude of approximately 3,000 metres, rising into the sunlight again and he began suffering from aching pain in his ears so he valved to release gas, and descended to land gently about 3 km away at Tour du Lay. Unlike the Robert brothers, Charles never flew again, among the special enclosure crowd was Benjamin Franklin, the diplomatic representative of the United States of America. Also present was Joseph Montgolfier, whom Charles honoured by asking him to release the small, bright green, pilot balloon to assess the wind and weather conditions. This event took place ten days after the worlds first manned flight by Jean-François Pilâtre de Rozier using a Montgolfier brothers hot air balloon
31.
Jean Baptiste Meusnier
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Jean Baptiste Marie Charles Meusnier de la Place was a French mathematician, engineer and Revolutionary general. He is best known for Meusniers theorem on the curvature of surfaces and he worked with Lavoisier on the decomposition of water and the evolution of hydrogen. This concerned an elliptical balloon 84 metres long, with a capacity of 1,700 cubic metres, the basket, in the form of a boat, was suspended from the canopy on a system of three ropes. After their successful hydrogen balloon flights in 1783, professor Jacques Charles and their design incorporated Meusniers internal ballonnet, a rudder, and a method of propulsion. On July 15,1784 the brothers flew for 45 minutes from Saint-Cloud to Meudon with M. Collin-Hullin and Louis Philippe II, rather than 80 men it was fitted with oars for propulsion and direction, but these proved useless. The absence of a gas release valve meant that the duke had to slash the envelope to prevent it rupturing when they reached an altitude of about 4,500 metres. This was the first flight over 100 km, in 1852, sixty six years after Charles and the Robert brothers oar powered dirigible, Henri Giffards design for the first successful powered airship was inspired by Meusniers ideas. During his military career he was put in charge of coastal defences in 1791, fighting the Prussians on the Rhine, he was injured during the siege of Mainz and died of his wounds. For his military service, his is one of the names inscribed under the Arc de Triomphe, timeline of hydrogen technologies Jules Michelet, Histoire de la Révolution française Richard S. Hartenberg, Technology and Culture, Vol.7, No. 3, pp. 410–411 Jean Meusnier, Mém. prés
32.
Beuvry
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Beuvry is a commune in the Pas-de-Calais department in the Hauts-de-France region in northern France. A suburban town immediately southwest of Béthune,23 miles southwest of Lille, at the junction of the D945, D72, light industry and a little farming have replaced the coal mining of the past. The towns name comes from beaver and underwent variations on this over the centuries, Berri, Beuvri, Bevery, Bouvry and finally Beuvry. On September 19,1784 the Robert brothers plus M. Collin-Hullin flew their hydrogen balloon, La Caroline, for 6 hours 40 minutes, covering 186 km from Paris to Beuvry. La Caroline owed its design to the work of professor Jacques Charles and Jean Baptiste Meusnier, in the Ville de Beuvry a stone monument was erected to commemorate the 200th anniversary landing of the brothers in La Caroline on September 19,1784. A celebration ball la ducasse du Ballon is now held at the end of every September, the town has been awarded the Croix de guerre twice, after World War I and again, after World War II. A coal-mining town for about 100 years, the last pit closed in the 1960s, the town was merged with the nearby city of Béthune at the end of 1993. The municipal election in September 1997 led to a de-merger and Beuvry became an independent full-fledged town again in November 1997, the church of St. Martin, dating from the sixteenth century. An old windmill The Prévôté building, the Commonwealth War Graves Commission cemetery. Beuvry is twinned with, Hemer, Germany, communes of the Pas-de-Calais department INSEE commune file A website about the history of Beuvry The CWGC cemetery The Gorre CWGC cemetery Beuvry on the Quid website
33.
Thrust
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Thrust is a reaction force described quantitatively by Isaac Newtons second and third laws. When a system expels or accelerates mass in one direction, the mass will cause a force of equal magnitude. The force applied on a surface in a direction perpendicular or normal to the surface is called thrust. Force, and thus thrust, is measured in the International System of Units as the newton, in mechanical engineering, force orthogonal to the main load is referred to as thrust. A fixed-wing aircraft generates forward thrust when air is pushed in the direction opposite to flight. This can be done in several ways including by the blades of a propeller, or a rotating fan pushing air out from the back of a jet engine. The forward thrust is proportional to the mass of the airstream multiplied by the difference in velocity of the airstream, reverse thrust can be generated to aid braking after landing by reversing the pitch of variable-pitch propeller blades, or using a thrust reverser on a jet engine. Rotary wing aircraft and thrust vectoring V/STOL aircraft use engine thrust to support the weight of the aircraft, a motorboat generates thrust when the propellers are turned to accelerate water backwards. The resulting thrust pushes the boat in the direction from the combustion chamber through the rocket engine nozzle. For vertical launch of a rocket the initial thrust at liftoff must be more than the weight. Each of the three Space Shuttle Main Engines could produce a thrust of 1.8 MN, and each of the Space Shuttles two Solid Rocket Boosters 14.7 MN, together 29.4 MN. By contrast, the simplified Aid For EVA Rescue has 24 thrusters of 3.56 N each, in the air-breathing category, the AMT-USA AT-180 jet engine developed for radio-controlled aircraft produce 90 N of thrust. The GE90-115B engine fitted on the Boeing 777-300ER, recognized by the Guinness Book of World Records as the Worlds Most Powerful Commercial Jet Engine, has a thrust of 569 kN. The power needed to generate thrust and the force of the thrust can be related in a non-linear way and this helps to explain why moving through water is easier and why aircraft have much larger propellers than watercraft do. A very common question is how to contrast the thrust rating of a jet engine with the rating of a piston engine. Such comparison is difficult, as quantities are not equivalent. A piston engine does not move the aircraft by itself, so piston engines are rated by how much power they deliver to the propeller. Except for changes in temperature and air pressure, this quantity depends basically on the throttle setting, a jet engine has no propeller, so the propulsive power of a jet engine is determined from its thrust as follows
34.
Lift (force)
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A fluid flowing past the surface of a body exerts a force on it. Lift is the component of force that is perpendicular to the oncoming flow direction. It contrasts with the force, which is the component of the surface force parallel to the flow direction. If the fluid is air, the force is called an aerodynamic force, in water, it is called a hydrodynamic force. Lift is also exploited in the world, and even in the plant world by the seeds of certain trees. When an aircraft is flying straight and level most of the lift opposes gravity, however, when an aircraft is climbing, descending, or banking in a turn the lift is tilted with respect to the vertical. Lift may also be entirely downwards in some aerobatic manoeuvres, or on the wing on a racing car, in this last case, the term downforce is often used. Lift may also be horizontal, for instance on a sail on a sailboat. Aerodynamic lift is distinguished from other kinds of lift in fluids, Aerodynamic lift requires relative motion of the fluid which distinguishes it from aerostatic lift or buoyancy lift as used by balloons, blimps, and dirigibles. An airfoil is a shape that is capable of generating significantly more lift than drag. A flat plate can generate lift, but not as much as a streamlined airfoil, there are several ways to explain how an airfoil generates lift. Some are more complicated or more rigorous than others, some have been shown to be incorrect. For example, there are based directly on Newton’s laws of motion. Either can be used to explain lift, an airfoil generates lift by exerting a downward force on the air as it flows past. According to Newtons third law, the air must exert an equal and opposite force on the airfoil, the air flow changes direction as it passes the airfoil and follows a path that is curved downward. According to Newtons second law, this change in flow direction requires a force applied to the air by the airfoil. Then, according to Newtons third law, the air must exert a force on the airfoil. The overall result is that a force, the lift, is generated opposite to the directional change
35.
Aerodynamic drag
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In aerodynamics, aerodynamic drag is the fluid drag force that acts on any moving solid body in the direction of the fluid freestream flow. Alternatively, calculated from the perspective, the drag force results from three natural phenomena, shock waves, vortex sheet, and viscosity. The pressure distribution acting on a surface exerts normal forces on the body. Those forces can be summed and the component of force that acts downstream represents the drag force, D p r. The nature of these normal forces combines shock wave effects, vortex system generation effects, the viscosity of the fluid has a major effect on drag. That is to say, the work the body does on the airflow, is reversible and is recovered as there are no effects to convert the flow energy into heat. Pressure recovery acts even in the case of viscous flow, viscosity, however results in pressure drag and it is the dominant component of drag in the case of vehicles with regions of separated flow, in which the pressure recovery is fairly ineffective. The friction drag force, which is a force on the aircraft surface, depends substantially on boundary layer configuration. The net friction drag, D f, is calculated as the projection of the viscous forces evaluated over the bodys surface. The sum of friction drag and pressure drag is called viscous drag and this drag component is due to viscosity. In a thermodynamic perspective, viscous effects represent irreversible phenomena and, therefore, the calculated viscous drag D v use entropy changes to accurately predict the drag force. When the airplane produces lift, another drag component results, induced drag, symbolized D i, is due to a modification of the pressure distribution due to the trailing vortex system that accompanies the lift production. An alternative perspective on lift and drag is gained from considering the change of momentum of the airflow, the wing intercepts the airflow and forces the flow to move downward. This results in an equal and opposite force acting upward on the wing which is the lift force, induced drag tends to be the most important component for airplanes during take-off or landing flight. Another drag component, namely wave drag, D w, results from shock waves in transonic and supersonic flight speeds, the shock waves induce changes in the boundary layer and pressure distribution over the body surface. The idea that a moving body passing through air or another fluid encounters resistance had been known since the time of Aristotle, louis Charles Breguets paper of 1922 began efforts to reduce drag by streamlining. Breguet went on to put his ideas into practice by designing several record-breaking aircraft in 1920s and 1930s, ludwig Prandtls boundary layer theory in the 1920s provided the impetus to minimise skin friction. A further major call for streamlining was made by Sir Melvill Jones who provided the concepts to demonstrate emphatically the importance of streamlining in aircraft design
36.
Weight
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In science and engineering, the weight of an object is usually taken to be the force on the object due to gravity. Weight is a vector whose magnitude, often denoted by an italic letter W, is the product of the m of the object. The unit of measurement for weight is that of force, which in the International System of Units is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, in this sense of weight, a body can be weightless only if it is far away from any other mass. Although weight and mass are scientifically distinct quantities, the terms are often confused with other in everyday use. There is also a tradition within Newtonian physics and engineering which sees weight as that which is measured when one uses scales. There the weight is a measure of the magnitude of the force exerted on a body. Typically, in measuring an objects weight, the object is placed on scales at rest with respect to the earth, thus, in a state of free fall, the weight would be zero. In this second sense of weight, terrestrial objects can be weightless, ignoring air resistance, the famous apple falling from the tree, on its way to meet the ground near Isaac Newton, is weightless. Further complications in elucidating the various concepts of weight have to do with the theory of relativity according to gravity is modelled as a consequence of the curvature of spacetime. In the teaching community, a debate has existed for over half a century on how to define weight for their students. The current situation is that a set of concepts co-exist. Discussion of the concepts of heaviness and lightness date back to the ancient Greek philosophers and these were typically viewed as inherent properties of objects. Plato described weight as the tendency of objects to seek their kin. To Aristotle weight and levity represented the tendency to restore the order of the basic elements, air, earth, fire. He ascribed absolute weight to earth and absolute levity to fire, archimedes saw weight as a quality opposed to buoyancy, with the conflict between the two determining if an object sinks or floats. The first operational definition of weight was given by Euclid, who defined weight as, weight is the heaviness or lightness of one thing, compared to another, operational balances had, however, been around much longer. According to Aristotle, weight was the cause of the falling motion of an object
37.
Camber (aerodynamics)
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In aeronautics and aeronautical engineering, camber is the asymmetry between the top and the bottom surfaces of an aerofoil. An aerofoil that is not cambered is called a symmetrical aerofoil, the benefits of camber, in contrast to symmetrical aerofoils, were discovered and first utilized by Sir George Cayley in the early 19th century. Camber is usually designed into an aerofoil to increase the lift coefficient. This minimizes the speed of aircraft using the aerofoil. Aircraft with wings based on cambered aerofoils usually have lower stalling speeds than similar aircraft with wings based on symmetric aerofoils, an aircraft designer may also reduce the camber of the outboard section of the wings to increase the critical angle of attack at the wing tips. Some recent designs use negative camber, one such design is called the supercritical aerofoil. It is used for flight, and produces a higher lift to drag ratio at near supersonic flight than traditional aerofoils. Supercritical aerofoils employ a flattened surface, highly cambered aft section. These changes delay the onset of wave drag, the camber of an aerofoil can be defined by a camber line, which is the curve that is halfway between the upper and lower surfaces of the aerofoil. To fully define an aerofoil we also need a thickness function T, such an aerofoil is useful in certain situations, such as with tailless aircraft, because the moment about the aerodynamic center of the aerofoil can be 0. A camber line for such an aerofoil can be defined as follows, the thickness distribution for a NACA 4-series aerofoil was used, with a 12% thickness ratio. The equation for this distribution is, T ¯ = t 0.2 Where t is the thickness ratio. Chord NACA airfoil Aerodynamic drag Zero lift axis Sources Desktop Aerodynamics Digital Textbook, theory of Wing Sections, Ira H. Abbott and Albert E. Von Doenhoff ISBN 0-486-60586-8
38.
Airfoil
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An airfoil or aerofoil is the shape of a wing, blade, or sail. An airfoil-shaped body moved through a fluid produces an aerodynamic force, the component of this force perpendicular to the direction of motion is called lift. The component parallel to the direction of motion is called drag, subsonic flight airfoils have a characteristic shape with a rounded leading edge, followed by a sharp trailing edge, often with a symmetric curvature of upper and lower surfaces. Foils of similar function designed with water as the fluid are called hydrofoils. The lift on an airfoil is primarily the result of its angle of attack, when oriented at a suitable angle, the airfoil deflects the oncoming air, resulting in a force on the airfoil in the direction opposite to the deflection. This force is known as force and can be resolved into two components, lift and drag. Most foil shapes require an angle of attack to generate lift. This turning of the air in the vicinity of the airfoil creates curved streamlines, resulting in pressure on one side. The lift force can be related directly to the average top/bottom velocity difference without computing the pressure by using the concept of circulation, a fixed-wing aircrafts wings, horizontal, and vertical stabilizers are built with airfoil-shaped cross sections, as are helicopter rotor blades. Airfoils are also found in propellers, fans, compressors and turbines, sails are also airfoils, and the underwater surfaces of sailboats, such as the centerboard and keel, are similar in cross-section and operate on the same principles as airfoils. Swimming and flying creatures and even many plants and sessile organisms employ airfoils/hydrofoils, common examples being bird wings, the bodies of fish, an airfoil-shaped wing can create downforce on an automobile or other motor vehicle, improving traction. Any object with an angle of attack in a fluid, such as a flat plate. Airfoils are more efficient lifting shapes, able to more lift. A lift and drag curve obtained in wind tunnel testing is shown on the right, the curve represents an airfoil with a positive camber so some lift is produced at zero angle of attack. With increased angle of attack, lift increases in a linear relation. At about 18 degrees this airfoil stalls, and lift falls off quickly beyond that, the drop in lift can be explained by the action of the upper-surface boundary layer, which separates and greatly thickens over the upper surface at and past the stall angle. The thicker boundary layer also causes an increase in pressure drag, so that the overall drag increases sharply near. Airfoil design is a facet of aerodynamics
39.
Dihedral (aeronautics)
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Dihedral angle is the upward angle from horizontal of the wings or tailplane of a fixed-wing aircraft. Anhedral angle is the given to negative dihedral angle, that is. Dihedral angle has an influence on dihedral effect, which is named after it. Dihedral effect is the amount of roll moment produced per degree of sideslip, dihedral effect is a critical factor in the stability of an aircraft about the roll axis. It is also pertinent to the nature of an aircrafts Dutch roll oscillation, longitudinal dihedral is a comparatively obscure term related to the pitch axis of an airplane. It is the angle between the zero axis of the wing and horizontal tail. Longitudinal dihedral can influence the nature of controllability about the pitch axis, when the term dihedral is used by itself it is usually intended to mean dihedral angle. However, context may otherwise indicate that dihedral effect is the intended meaning, dihedral Angle is the upward angle from horizontal of the wings of a fixed-wing aircraft, or of any paired nominally-horizontal surfaces on any aircraft. The term can apply to the wings of a bird. Dihedral Angle is also used in some types of such as box kites. Wings with more than one Angle change along the span are said to be polyhedral. Dihedral Angle has important stabilizing effects on flying bodies because it has an influence on the dihedral effect. Dihedral effect of an aircraft is a rolling moment resulting from the vehicle having an angle of sideslip. Increasing the dihedral angle of an aircraft increases the effect on it. However, many other parameters also have a strong influence on dihedral effect. Some of these important factors are, wing sweep, vertical center of gravity, dihedral angle on an aircraft almost always implies the angle between two paired surfaces, one on each side of the aircraft. Even then, it is almost always between the left and right wings, however, mathematically dihedral means the angle between any two planes. Longitudinal dihedral can also mean the angle between the zero axis of the wing and tail instead of between the root chords of the two surfaces
40.
Parachute
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A parachute is a device used to slow the motion of an object through an atmosphere by creating drag. Parachutes are usually out of light, strong cloth, originally silk. Parachutes often take the shape of a dome, but shapes may vary including some taking the shape of an inverted dome, depending on the situation, parachutes are used with a variety of loads, including people, food, equipment, space capsules, and bombs. Drogue chutes are used to aid horizontal deceleration of a vehicle, the earliest evidence for the parachute dates back to the Renaissance period. The oldest parachute design appears in a manuscript from 1470s Renaissance Italy. As a safety measure, four straps run from the ends of the rods to a waist belt, shortly after, a more sophisticated parachute was sketched by the polymath Leonardo da Vinci in his Codex Atlanticus dated to ca. Here, the scale of the parachute is in a more favorable proportion to the weight of the jumper, Leonardos canopy was held open by a square wooden frame, which alters the shape of the parachute from conical to pyramidal. It is not known whether the Italian inventor was influenced by the earlier design, the feasibility of Leonardos pyramidal design was successfully tested in 2000 by Briton Adrian Nicholas and again in 2008 by the Swiss skydiver Olivier Vietti-Teppa. The Croatian polymath and inventor Faust Vrančić examined da Vincis parachute sketch and he kept the square frame, but replaced the canopy with a bulging sail-like piece of cloth that he came to realize decelerates the fall more effectively. However, in book, John Wilkins wrote about flying. The modern parachute was invented in the late 18th century by Louis-Sébastien Lenormand in France, Lenormand also sketched his device beforehand. Two years later, in 1785, Lenormand coined the word parachute by hybridizing a Latin prefix para, and chute, also in 1785, Jean-Pierre Blanchard demonstrated it as a means of safely disembarking from a hot-air balloon. Subsequent development of the focused on it becoming more compact. In 1797, André Garnerin made the first descent using such a parachute, Garnerin also invented the vented parachute, which improved the stability of the fall. In 1907 Charles Broadwick demonstrated two key advances in the parachute he used to jump from hot air balloons at fairs and he folded his parachute into a pack he wore on his back. And the parachute was pulled from the pack by a line attached to the balloon. When Broadwick jumped from the balloon, the line became taut, pulled the parachute from the pack. In 1911 a successful test took place with a dummy at the Eiffel tower in Paris, the puppets weight was 75 kg, the parachutes weight was 21 kg
41.
Otto Lilienthal
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Otto Lilienthal was a German pioneer of aviation who became known as the flying man. He was the first person to make well-documented, repeated, successful flights with unpowered airplanes, newspapers and magazines published photographs of Lilienthal gliding, favorably influencing public and scientific opinion about the possibility of flying machines becoming practical. On August 9,1896, his glider stalled and he was unable to regain control, falling from about 15 m, he broke his neck and died the next day,10 August 1896. Lilienthal was born on 23 May 1848 in Anklam, Pomerania Province, according to his birth certificate, his parents were Carl Gustav, a merchant, and Caroline Wilhemina née Pohle. They belonged to the St. Nikolai evangelical church community in Anklam, where he attended grammar school. Fascinated by the idea of manned flight, Lilienthal and his brother made strap-on wings and he then attended the regional technical school in Potsdam for two years and trained at the Schwarzkopf Company before becoming a professional design engineer. He would later attend the Royal Technical Academy in Berlin, in 1867, Lilienthal began his experiments on the force of air in earnest, interrupted when he served in the Franco-Prussian War. As a staff engineer in various engineering companies, Lilienthal received his first patent for a mining machine, five years later he founded his own company to make boilers and steam engines. Lilienthal published his famous book Birdflight as the Basis of Aviation in 1889, Lilienthal was born to middle-class parents. They had eight children, but only three of them survived infancy, Otto, Gustav, and Marie, the brothers worked together all their lives on technical, social and cultural projects. On 6 June 1878, Lilienthal married Agnes Fischer, daughter of a deputy, music brought them together, she was trained in piano and voice while Lilienthal played the French horn and had a good tenor voice. After marriage, they took up residence in Berlin and had four children, Otto, Anna, Fritz, Lilienthals greatest contribution was in the development of heavier-than-air flight. He made his flights from a hill he built near Berlin and from natural hills. Patent in 1894 by Lilienthal directed pilots to grip the bar for carrying and flying the hang glider, the A-frame of Percy Pilcher and Lilienthal echoes in todays control frame for hang gliders and ultralight aircraft. His total flying time was five hours, at the beginning, in 1891, Lilienthal succeeded with jumps and flights covering a distance of about 25 metres. He could use the updraft of a 10 m/s wind against a hill to remain stationary with respect to the ground, in 1893, in the Rhinow Hills, he was able to achieve flight distances as long as 250 metres. This record remained unbeaten for him or anyone else at the time of his death, Lilienthal did research in accurately describing the flight of birds, especially storks, and used polar diagrams for describing the aerodynamics of their wings. He made many experiments in an attempt to gather reliable aeronautical data, during his short flying career, Lilienthal developed a dozen models of monoplanes, wing flapping aircraft and two biplanes
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Horatio Frederick Phillips
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Horatio Frederick Phillips was an English aviation pioneer. He was famous for building multiplane flying machines with more sets of lifting surfaces than are normal on modern aircraft. However he made a lasting contribution to aeronautics in his work on aerofoil design. Phillips devised a wind tunnel in which he studied a variety of aerofoil shapes for use in providing lift. The tunnel was unusual in that the gas flow was provided by steam rather than air, by 1884 he was able to register his first patent, and more were to follow. He demonstrated the truth of George Cayleys idea that giving the surface greater curvature than the lower accelerates the upper airflow, reducing pressure above the wing. Phillips believed that multiple stacked wing planes, in Venetian blind configuration and his 1893 Flying Machine had 50 lifting surfaces and used his patented double-surface airfoils in such a way as to produce an aspect ratio of 1,152, providing great lift at the sacrifice of stability. As a test vehicle, it was not designed to be manned and its maximum load was found to be 400 lb. His 1904 Multiplane was a development of the 1893 test vehicle in a configuration that could be flown by a person and it had 21 wings and had a tail for stability, but was unable to achieve sustained flight. Its best performance was 50 ft, a specially made replica of the 1904 machine appears in the opening sequences of the 1965 film Those Magnificent Men in their Flying Machines. His 1907 Multiplane, which had 200 individual airfoils and was powered by a 22 hp engine driving a 7 ft propeller achieved a 500 ft flight on 6 April 1907. This was the first flight of its kind in England, although it was preceded by the Wright brothers by several years, though successful, the 1907 model showed poor performance compared to more conventional contemporary types. This caused Phillips to end his attempts at manned flight
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Eurofighter Typhoon
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The Eurofighter Typhoon is a twin-engine, canard-delta wing, multirole fighter. NATO Eurofighter and Tornado Management Agency manages the project and is the prime customer, the aircrafts development effectively began in 1983 with the Future European Fighter Aircraft programme, a multinational collaboration among the UK, Germany, France, Italy, and Spain. Disagreements over design authority and operational requirements led France to leave the consortium to develop the Dassault Rafale independently. A technology demonstration aircraft, the British Aerospace EAP, first took flight on 6 August 1986, the aircrafts name, Typhoon, was adopted in September 1998, the first production contracts were also signed that year. The Royal Air Force of Oman and the Kuwait Air Force are export customers, the Eurofighter Typhoon is a highly agile aircraft, designed to be a supremely effective dogfighter in combat. The Typhoon had its debut during the 2011 military intervention in Libya with the Royal Air Force. The type has also taken responsibility for air-defence duties for the majority of customer nations. The UK had identified a requirement for a new fighter as early as 1971, the AST403 specification, issued by the Air staff in 1972, led to the P.96 conventional tailed design presented in the late 1970s. The P.96 design had potential for growth. However, the simultaneous West German requirement for a new fighter had led by 1979 to the development of the TKF-90 concept and this was a cranked delta wing design with forward close-coupled-canard controls and artificial stability. In 1979, Messerschmitt-Bölkow-Blohm and British Aerospace presented a proposal to their respective governments for the ECF. In October 1979 Dassault joined the ECF team for a tri-national study and it was at this stage of development the Eurofighter name was first attached to the aircraft. The development of different national prototypes continued, the UK produced two designs, the P.106 was a single-engined lightweight fighter, superficially resembling the JAS39 Gripen, the P.110 was a twin-engined fighter. The RAF rejected the P.106 concept on the grounds it had half the effectiveness of the aircraft at two-thirds of the cost. West Germany continued to refine the TKF-90 concept, consequently, the Panavia partners launched the Agile Combat Aircraft programme in April 1982. The ACA was very similar to the BAe P.110, having a delta wing, canards. One major external difference was the replacement of the engine intakes with a chin intake. The ACA was to be powered by a version of the RB199
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Antonov An-225 Mriya
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The Antonov An-225 Mriya is a strategic airlift cargo aircraft that was designed by the Antonov Design Bureau in the Ukrainian SSR within the Soviet Union during the 1980s. It is powered by six engines and is the longest and heaviest airplane ever built. It also has the largest wingspan of any aircraft in operational service, the single example built has the Ukrainian civil registration UR-82060. A second airframe with a different configuration was partially built. Its construction was halted in 1994 because of lack of funding and interest, on 30 August 2016, Antonov agreed to complete the second airframe for Aerospace Industry Corporation of China as a prelude to AICC commencing series production. The Antonov An-225, initially developed for the task of transporting the Buran spaceplane, was an enlargement of the successful Antonov An-124, the first and only An-225 was completed in 1988. After successfully fulfilling its Soviet military missions, it was mothballed for eight years and it was then refurbished and re-introduced, and is in commercial operation with Antonov Airlines carrying oversized payloads. The airlifter holds the world records for an airlifted single-item payload of 189,980 kilograms. It has also transported a payload of 247,000 kg on a commercial flight, the Antonov An-225 was designed to airlift the Energia rockets boosters and the Buran orbiter for the Soviet space program. It was developed as a replacement for the Myasishchev VM-T, the An-225s original mission and objectives are almost identical to that of the United States Shuttle Carrier Aircraft. The An-225 first flew on 21 December 1988 with a 74-minute flight from Kiev, the aircraft was on static display at the Paris Air Show in 1989 and it flew during the public days at the Farnborough air show in 1990. Two aircraft were ordered, but only one An-225 was finished and it can carry ultra-heavy and oversize freight, up to 250,000 kg internally, or 200,000 kg on the upper fuselage. Cargo on the fuselage can be 70 m long. A second An-225 was partially built during the late 1980s for the Soviet space program, following the collapse of the Soviet Union in 1991 and the cancellation of the Buran space program, the lone operational An-225 was placed in storage in 1994. The six Ivchenko-Progress engines were removed for use on An-124s, the first An-225 was later re-engined and put into service. By 2000, the need for additional An-225 capacity had become apparent, the second airframe was scheduled for completion around 2008, then delayed. By August 2009, the aircraft had not been completed and work had been abandoned, according to different sources, the second aircraft is 60–70% complete. In April 2013, the Russian government announced plans to revive Soviet-era air launch projects that would use a modification to the An-225 as a midair launchpad
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Aerospace engineering
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Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches, aeronautical engineering and astronautical engineering, avionics engineering is similar, but deals with the electrical side of aerospace engineering. Aeronautical engineering was the term for the field. As flight technology advanced to include craft operating in outer space, Aerospace engineering, particularly the astronautics branch, is often colloquially referred to as rocket science. Flight vehicles are subjected to demanding conditions such as produced by changes in atmospheric pressure and temperature. The interaction between these technologies is known as aerospace engineering, because of the complexity and number of disciplines involved, aerospace engineering is carried out by teams of engineers, each having their own specialized area of expertise. Early knowledge of engineering was largely empirical with some concepts. Scientists understood some key elements of aerospace engineering, like fluid dynamics, many years later after the successful flights by the Wright brothers, the 1910s saw the development of aeronautical engineering through the design of World War I military aircraft. The first definition of aerospace engineering appeared in February 1958, the definition considered the Earths atmosphere and the outer space as a single realm, thereby encompassing both aircraft and spacecraft under a newly coined word aerospace. In response to the USSR launching the first satellite, Sputnik into space on October 4,1957, the National Aeronautics and Space Administration was founded in 1958 as a response to the Cold War. Some of the elements of aerospace engineering are, Radar cross-section – the study of vehicle signature apparent to Radar remote sensing, fluid mechanics – the study of fluid flow around objects. Specifically aerodynamics concerning the flow of air over bodies such as wings or through objects such as wind tunnels, astrodynamics – the study of orbital mechanics including prediction of orbital elements when given a select few variables. While few schools in the United States teach this at the undergraduate level, statics and Dynamics – the study of movement, forces, moments in mechanical systems. Mathematics – in particular, calculus, differential equations, and linear algebra, electrotechnology – the study of electronics within engineering. Propulsion – the energy to move a vehicle through the air is provided by internal combustion engines, jet engines and turbomachinery, a more recent addition to this module is electric propulsion and ion propulsion. Control engineering – the study of modeling of the dynamic behavior of systems and designing them, usually using feedback signals. This applies to the behavior of aircraft, spacecraft, propulsion systems. Aircraft structures – design of the configuration of the craft to withstand the forces encountered during flight
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