1.
MAKS Air Show
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MAKS is an international airshow held at Zhukovsky International Airport, the home of the Gromov Flight Research Institute in Zhukovsky,40 km southeast of Moscow, Russia. The event was organized by the Russian Ministry of Industry and Trade until 2009, more recently by the Government of Moscow, the first show, Mosaeroshow-92, was held in 1992. Since 1993, the airshow was renamed as MAKS and is held biennially on odd years, MAKS is an important event for the Russian aviation industry and the Commonwealth of Independent States. The airshows history traces back to 1911, when one was held in Mikhailovskiy square in Saint-Petersburg, the USSR held annual airshows on the Tushino airfield in Moscow 22 years later. Its history in Zhukovskiy, however, began later with the Engineering Show by Central Aerohydrodynamic Institute in 1990. The objective of the MAKS airshow is to demonstrate leading technologies, a large portion of the show is dedicated to holding scientific conferences and symposia, under the auspices of Russias Central Aerohydrodynamic Institute. The airshow is held in the city of Zhukovsky, at Zhukovsky International Airport, after the dissolution of the Soviet Union, many aviation companies eventually moved to Zhukovsky, using the Gromov Flight Research Institutes airfield for MosAeroShow-92 held on 11–16 August 1992. A second show was held in 1993, now renamed MAKS, since then the airshow has been held biannually. It lasts for six days, three of which are open to the general public, after this incident a Mi-8 was called to take the place of the destroyed Yak-38. The pilot from a Su-15 ejected during an experimental low-altitude ejection of a due to the inability to regain control. The prototype amphibious aircraft Be-103 crashed on the day before the opening of MAKS-1997, the pilot, Vladimir Nikolaevich Ulyanov, was killed. The death of Tkachenko was paid tribute to by a minute of silence at the opening of the airshow, the wing from an An-70 getting ready for takeoff scratched the ladder of a stationary aircraft. No one was hurt in this accident, nor were the aircraft, antonov denied the occurrence of this collision, and the An-70 flew to Kiev on August 20. An L-39 from the Baltic bees left the runway while landing, a PAK FA suffered a compressor stall while accelerating, after which a drogue chute was deployed and the aircraft stopped on the runway. A main criticism of the airshow is the influx of visitors. The high cost of electricity and the lack of air conditioning in the exhibition halls are also subject to criticism. Some critics accused the organizers for still showing outdated Soviet-era aircraft, critics believe that the MAKS is still inferior to other leading airshows of the world, and do not agree with other parts of Russian and western press. The Danish daily newspaper Børsen comments that the MAKS is not worse than the Le Bourget, the airshow administration argues that the airshows are conducted in a highly organized fashion, and is the hallmark of Russia.1 to 1.8 times lower than that at Farnborough
2.
Cargo aircraft
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A cargo aircraft is a fixed-wing aircraft that is designed or converted for the carriage of cargo rather than passengers. Such aircraft usually do not incorporate passenger amenities and generally one or more large doors for loading cargo. Freighters may be operated by passenger or cargo airlines, by private individuals or by the armed forces of individual countries. Cargo aircraft represent a small proportion of the air freight market. The majority is carried in special ULD containers in the holds of normal passenger aircraft. Aircraft were put to use carrying cargo in the form of air mail as early as 1911, although the earliest aircraft were not designed primarily as cargo carriers, by the mid-1920s aircraft manufacturers were designing and building dedicated cargo aircraft. The Vickers Vernon, a development of the Vickers Vimy Commercial, in February 1923 this was put to use by the RAFs Iraq Command who flew nearly 500 Sikh troops from Kingarban to Kirkuk in the first ever strategic airlift of troops. The Victorians also helped to pioneer air routes for Imperial Airways Handley Page HP.42 airliners, the World War II German design, the Arado Ar 232 was the first purpose built cargo aircraft. The Ar 232 was intended to supplant the earlier Junkers Ju 52 freighter conversions, most other forces used freighter versions of airliners in the cargo role as well, most notably the C-47 Skytrain version of the Douglas DC-3, which served with practically every Allied nation. This aircraft, like most of its era, used tail-dragger landing gear caused the aircraft to have a decided rearward tilt when landed. A similar rear loading ramp even appeared in a different form on the nosewheel gear-equipped. Postwar Europe also served to play a role in the development of the modern air cargo. To rapidly supply the numbers of aircraft, many older types. In operation it was found that it took as long or longer to unload these older designs as the much larger tricycle landing gear Douglas C-54 Skymaster which was easier to move about in when landed. The C-47s were quickly removed from service, and from then on flat-decks were a requirement of all new cargo designs, in the years following the war era a number of new custom-built cargo aircraft were introduced, often including some experimental features. For instance, the USs C-82 Packet featured a cargo area. Although larger, smaller and faster designs have been proposed for many years and these designs offer the ability to carry the heaviest loads, even main battle tanks, at global ranges. The Boeing 747 was originally designed to the specification as the C-5
3.
Soviet Air Forces
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The Soviet Air Forces was the official designation of one of the air forces of the Soviet Union. The other was the Soviet Air Defence Forces, the Air Forces were formed from components of the Imperial Russian Air Service in 1917, and faced their greatest test during World War II. The groups were involved in the Korean War, and dissolved along with the Soviet Union itself in 1991–92. Former Soviet Air Forces assets were divided into several air forces of former Soviet republics. March of the Pilots was its anthem, the All-Russia Collegium for Direction of the Air Forces of the Old Army was formed on 20 December 1917. This was a Bolshevik aerial headquarters initially led by Konstantin Akashev and it became the Directorate of the USSR Air Forces on 28 March 1924, and then the Directorate of the Workers-Peasants Red Army Air Forces on 1 January 1925. Gradually its influence on aircraft design became greater, from its earliest days, the force mimicked ground forces organization especially in the 1930s, by which time it was made up of air armies, aviation corps, aviation divisions, and aviation regiments. At first, the I-16 proved superior to any Luftwaffe fighters, however, the Soviets refused to supply the plane in adequate numbers, and their aerial victories were soon squandered because of their limited use. Later, Bf-109s delivered to Francos Spanish Nationalist air forces secured air superiority for the Nationalists, on 19 November 1939, VVS headquarters was again titled the Main Directorate of the Red Army Air Forces under the WPRA HQ. Between 1933 and 1938, the Soviet government planned and funded missions to break numerous world aviation records, not only did aviation records and achievements become demonstrations of the USSRs technological progress, they also served as legitimization of the socialist system. With each new success, Soviet press trumpeted victories for socialism, furthermore, Soviet media idolized record-breaking pilots, exalting them not only as role models for Soviet society, but also as symbols of progress towards the socialist-utopian future. The early 1930s saw a shift in focus away from collectivist propaganda. In the case of aviation, the government began glorifying people who utilized aviation technology instead of glorifying the technology itself. Pilots such as Valery Chkalov, Georgy Baydukov, Alexander Belyakov, in May 1937, Stalin charged pilots Chkalov, Baydukov, and Belyakov with the mission to navigate the first transpolar flight in history. On 20 June 1937, the aviators landed their ANT-25 in Vancouver, a month later, Stalin ordered the departure of a second crew to push the boundaries of modern aviation technology even further. The public reaction to the flights was euphoric. The media called the pilots Bolshevik knights of culture and progress, Soviet citizens celebrated Aviation Day on 18 August with as much zeal as they celebrated the October Revolution anniversary. Literature including poems, short stories, and novels emerged celebrating the feats of the aviator-celebrities, feature films like Victory, Tales of Heroic Aviators, and Valery Chkalov reinforced the positive hero imagery, celebrating the aviators individuality within the context of a socialist government
4.
Roscosmos
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The Roscosmos State Corporation for Space Activities, commonly known as Roscosmos, is the governmental body responsible for the space science program of Russia and general aerospace research. The Corporation was established on the basis of the now-defunct Federal Space Agency on December 28,2015, Roscosmos was previously known as the Russian Aviation and Space Agency. The headquarters of Roscosmos are located in Moscow, while the main Mission Control space center is located in the city of Korolev. The Yuri Gagarin Cosmonaut Training Center is in Star City, the Launch facilities used are Baikonur Cosmodrome in Kazakhstan, and Vostochny Cosmodrome being built in the Russian Far East in Amur Oblast. The current Director since January 2015 is Igor Komarov, in 2015 the Russian government merged Roscosmos with the United Rocket and Space Corporation, the re-nationalized Russian space industry, to create the Roscosmos State Corporation. The Soviet space program did not have central executive agencies, instead, its organizational architecture was multi-centered, it was the design bureaus and the council of designers that had the most say, not the political leadership. The creation of a central agency after the separation of Russia from the Soviet Union was therefore a new development, Russian Space Agency was formed on February 25,1992, by a decree of President Yeltsin. Yuri Koptev, who had worked with designing Mars landers at NPO Lavochkin. In the early years, the agency suffered from lack of authority as the design bureaus fought to protect their own spheres of operation. For example, the decision to keep Mir in operation beyond 1999 was not taken by the agency, instead, another example is that the decision to develop the new Angara rocket was rather a function of Khrunichevs ability to attract resources than a conscious long-term decision by the agency. The 1990s saw serious financial problems because of decreased cash flow and this resulted in Roscosmos leading role in commercial satellite launches and space tourism. In March 2004, director Yuri Koptev was replaced by Anatoly Perminov, the Russian economy boomed throughout 2005 from high prices for exports, such as oil and gas, the outlook for future funding in 2006 appeared more favorable. The budget for 2006 was as high as 25 billion rubles, under the current 10-year budget approved, the budget of the Space Agency shall increase 5–10% per year, providing the space agency with a constant influx of money. In addition to the budget, Roscosmos plans to have over 130 billion rubles flowing into its budget by other means, such as industry investments and it is around the time US-based The Planetary Society entered a partnership with Roscosmos. In 2011, the government spent 115 billion rubles in the space programs. The proposed project core budget for 2013 to be around 128.3 billion rubles, the budget for the whole space program is,169.8 billion rubles. By 2015, the amount of the budget can be increased to 199.2 billion rubles, priorities of the Russian space program include the new Angara rocket family and development of new communications, navigation and remote Earth sensing spacecraft. The GLONASS global navigation system has for many years been one of the top priorities and has been given its own budget line in the federal space budget
5.
Soviet space program
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The Soviet space program comprised the rocketry and space exploration programs conducted by the former Soviet Union from the 1930s until its dissolution in 1991. Sergey Korolev was the head of the design group, his official title was chief designer. Because of the programs classified status, and for value, announcements of the outcomes of missions were delayed until success was certain. Ultimately, as a result of Mikhail Gorbachevs policy of glasnost in the 1980s, with the collapse of the Soviet Union, Russia and Ukraine inherited the program. Russia created the Russian Aviation and Space Agency, now known as the Roscosmos State Corporation, on August 18,1933, GIRD launched the first Soviet liquid-fueled rocket Gird-09, and on November 25,1933, the first hybrid-fueled rocket GIRD-X. In 1940-41 another advance in the reactive propulsion field took place, during the 1930s Soviet rocket technology was comparable to Germanys, but Joseph Stalins Great Purge severely damaged its progress. Many leading engineers were killed, and Korolev and others were imprisoned in the Gulag, under the direction of Dimitri Ustinov, Korolev and others inspected the drawings. Korolevs OKB-1 design bureau was dedicated to the liquid-fueled cryogenic rockets he had been experimenting with in the late 1930s, ultimately, this work resulted in the design of the R-7 Semyorka intercontinental ballistic missile which was successfully tested in August 1957. The Soviet space program was tied to the USSRs Five-Year Plans, nonetheless, the first Soviet rocket with animals aboard launched in July 1951, the two dogs were recovered alive after reaching 101 km in altitude. Two months ahead of Americas first such achievement, this and subsequent flights gave the Soviets valuable experience with space medicine, Plans were approved for Earth-orbiting satellites to gain knowledge of space, and four unmanned military reconnaissance satellites, Zenit. Further planned developments called for a manned Earth orbit flight by 1964, with closed-loop life support systems and electrical rocket engines, and launched from large orbiting space stations, these plans were much more ambitious than Americas goal of landing on the moon. The Soviet space program was secondary in military funding to the Strategic Rocket Forces ICBMs, missions were planned based on rocket availability or ad hoc reasons, rather than scientific purposes. Korolev planned to move forward with the Soyuz craft and N-1 heavy booster that would be the basis of a permanent manned space station and manned exploration of the Moon. Yangel had been Korolevs assistant but with the support of the military he was given his own bureau in 1954 to work primarily on the military space program. This had the rocket engine design team including the use of hypergolic fuels. He also continued to develop his own heavy booster designs similar to Korolevs N-1 both for applications and for cargo flights into space to build future space stations. Glushko was the rocket engine designer but he had a personal friction with Korolev. Chelomei benefited from the patronage of Khrushchev and in 1960 was given the job of developing a rocket to send a manned craft around the moon
6.
Myasishchev M-4
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The Myasishchev design bureau was formed to build such a bomber. First flying soon after the first flight of the Boeing B-52 Stratofortress, the aircraft was a surprise to the United States, which had not known that the Soviets had built a jet bomber. However, it became clear that the bomber had an insufficient range to attack the United States. Only a few of the original production M-4s were actually put into service, to remedy this problem, the Myasishchev design bureau introduced the 3M, known to the West as the Bison-B, which was considerably more powerful than the previous version. This new model first flew in 1955, among other things, two of the five original gun barbettes were removed to lighten the aircraft. In July 1955 American observers saw 28 Bisons in two groups during a Soviet air show, the United States government believed that the bomber was in mass production, and the Central Intelligence Agency estimated that 800 would be available by 1960. The display was a hoax, the first group of ten repeated the flyby with eight more, the classified estimates led, however, to American politicians warning of a bomber gap. This time, it was not the Soviet Air Force that wanted the 3M, though it could still not bomb Washington, D. C. the 3M had a sufficient range to fulfill the need for a long-range maritime patrol aircraft. In 1959, the 3M broke numerous world records, however, it was thought by the West that the 3M was the original M-4, meaning that the capability of the M-4 was vastly overestimated by Western intelligence agencies. In the early 1960s, the Bison-C, with a search radar, was introduced. By this time, many of the original M-4s had been converted to M-4-2 fuel tankers for aerial refueling, later, 3Ms were converted to 3MS-2 and 3MN-2 tankers as well. Neither the M-4 nor the 3M ever saw combat, and none were converted for low-altitude attack, as many American B-52s were. Production of the Bison aircraft stopped in 1963, by which time 93 of them had been built, the last aircraft, an M-4-2 fuel tanker, was withdrawn from service in 1994. The three VM-T heavy lift aircraft were converted from 3MN-2 tankers, with large loads carried piggy-back above the fuselage. The single vertical fin/rudder was replaced with two large rectangular fin/rudders at the tips of the horizontal stabilizers to improve due to the turbulence caused by the cargo pod. With the withdrawal of the Myasishchev bombers and tankers the vast majority of the airframes were broken up under the terms of the relevant arms limitation treaty. SDB – The government designation for the M-4 programme, subject 25 – The VVS designation for the strategic bomber program. Myasishchev M-4 – The designation used for production aircraft,35 built including two prototypes and a static test article
7.
Airplane
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An airplane or aeroplane is a powered, fixed-wing aircraft that is propelled forward by thrust from a jet engine or propeller. Airplanes come in a variety of sizes, shapes, and wing configurations, the broad spectrum of uses for airplanes includes recreation, transportation of goods and people, military, and research. Commercial aviation is a massive industry involving the flying of tens of thousands of daily on airliners. Most airplanes are flown by a pilot on board the aircraft, the Wright brothers invented and flew the first airplane in 1903, recognized as the first sustained and controlled heavier-than-air powered flight. They built on the works of George Cayley dating from 1799, between 1867 and 1896, the German pioneer of human aviation Otto Lilienthal also studied heavier-than-air flight. Following its limited use in World War I, aircraft continued to develop. Airplanes had a presence in all the battles of World War II. The first jet aircraft was the German Heinkel He 178 in 1939, the first jet airliner, the de Havilland Comet, was introduced in 1952. The Boeing 707, the first widely successful commercial jet, was in service for more than 50 years. Aéroplane originally referred just to the wing, as it is a plane moving through the air, in an example of synecdoche, the word for the wing came to refer to the entire aircraft. In the United States and Canada, the airplane is used for powered fixed-wing aircraft. In the United Kingdom and most of the Commonwealth, the aeroplane is usually applied to these aircraft. Many stories from antiquity involve flight, such as the Greek legend of Icarus and Daedalus, and this machine may have been suspended for its flight. Some of the earliest recorded attempts with gliders were those by the 9th-century poet Abbas ibn Firnas, leonardo da Vinci researched the wing design of birds and designed a man-powered aircraft in his Codex on the Flight of Birds. In 1799, George Cayley set forth the concept of the airplane as a fixed-wing flying machine with separate systems for lift, propulsion. Cayley was building and flying models of fixed-wing aircraft as early as 1803, in 1856, Frenchman Jean-Marie Le Bris made the first powered flight, by having his glider LAlbatros artificiel pulled by a horse on a beach. Then Alexander F. Mozhaisky also made some innovative designs, in 1883, the American John J. Montgomery made a controlled flight in a glider. Other aviators who made similar flights at that time were Otto Lilienthal, Percy Pilcher, sir Hiram Maxim built a craft that weighed 3.5 tons, with a 110-foot wingspan that was powered by two 360-horsepower steam engines driving two propellers
8.
Soviet Union
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The Soviet Union, officially the Union of Soviet Socialist Republics was a socialist state in Eurasia that existed from 1922 to 1991. It was nominally a union of national republics, but its government. The Soviet Union had its roots in the October Revolution of 1917 and this established the Russian Socialist Federative Soviet Republic and started the Russian Civil War between the revolutionary Reds and the counter-revolutionary Whites. In 1922, the communists were victorious, forming the Soviet Union with the unification of the Russian, Transcaucasian, Ukrainian, following Lenins death in 1924, a collective leadership and a brief power struggle, Joseph Stalin came to power in the mid-1920s. Stalin suppressed all opposition to his rule, committed the state ideology to Marxism–Leninism. As a result, the country underwent a period of rapid industrialization and collectivization which laid the foundation for its victory in World War II and postwar dominance of Eastern Europe. Shortly before World War II, Stalin signed the Molotov–Ribbentrop Pact agreeing to non-aggression with Nazi Germany, in June 1941, the Germans invaded the Soviet Union, opening the largest and bloodiest theater of war in history. Soviet war casualties accounted for the highest proportion of the conflict in the effort of acquiring the upper hand over Axis forces at battles such as Stalingrad. Soviet forces eventually captured Berlin in 1945, the territory overtaken by the Red Army became satellite states of the Eastern Bloc. The Cold War emerged by 1947 as the Soviet bloc confronted the Western states that united in the North Atlantic Treaty Organization in 1949. Following Stalins death in 1953, a period of political and economic liberalization, known as de-Stalinization and Khrushchevs Thaw, the country developed rapidly, as millions of peasants were moved into industrialized cities. The USSR took a lead in the Space Race with Sputnik 1, the first ever satellite, and Vostok 1. In the 1970s, there was a brief détente of relations with the United States, the war drained economic resources and was matched by an escalation of American military aid to Mujahideen fighters. In the mid-1980s, the last Soviet leader, Mikhail Gorbachev, sought to reform and liberalize the economy through his policies of glasnost. The goal was to preserve the Communist Party while reversing the economic stagnation, the Cold War ended during his tenure, and in 1989 Soviet satellite countries in Eastern Europe overthrew their respective communist regimes. This led to the rise of strong nationalist and separatist movements inside the USSR as well, in August 1991, a coup détat was attempted by Communist Party hardliners. It failed, with Russian President Boris Yeltsin playing a role in facing down the coup. On 25 December 1991, Gorbachev resigned and the twelve constituent republics emerged from the dissolution of the Soviet Union as independent post-Soviet states
9.
Space Shuttle
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The Space Shuttle was a partially reusable low Earth orbital spacecraft system operated by the U. S. National Aeronautics and Space Administration, as part of the Space Shuttle program. Its official program name was Space Transportation System, taken from a 1969 plan for a system of reusable spacecraft of which it was the only item funded for development, the first of four orbital test flights occurred in 1981, leading to operational flights beginning in 1982. Five complete Shuttle systems were built and used on a total of 135 missions from 1981 to 2011, the Shuttle fleets total mission time was 1322 days,19 hours,21 minutes and 23 seconds. Shuttle components included the Orbiter Vehicle, a pair of solid rocket boosters. The Shuttle was launched vertically, like a rocket, with the two SRBs operating in parallel with the OVs three main engines, which were fueled from the ET. The SRBs were jettisoned before the vehicle reached orbit, and the ET was jettisoned just before orbit insertion, at the conclusion of the mission, the orbiter fired its OMS to de-orbit and re-enter the atmosphere. The orbiter then glided as a spaceplane to a landing, usually at the Shuttle Landing Facility of KSC or Rogers Dry Lake in Edwards Air Force Base. After landing at Edwards, the orbiter was back to the KSC on the Shuttle Carrier Aircraft. The first orbiter, Enterprise, was built in 1976 for use in Approach, four fully operational orbiters were initially built, Columbia, Challenger, Discovery, and Atlantis. Of these, two were lost in accidents, Challenger in 1986 and Columbia in 2003, with a total of fourteen astronauts killed. A fifth operational orbiter, Endeavour, was built in 1991 to replace Challenger, the Space Shuttle was retired from service upon the conclusion of Atlantiss final flight on July 21,2011. Nixons post-Apollo NASA budgeting withdrew support of all components except the Shuttle. The vehicle consisted of a spaceplane for orbit and re-entry, fueled by liquid hydrogen and liquid oxygen tanks. The first of four orbital test flights occurred in 1981, leading to operational flights beginning in 1982, all launched from the Kennedy Space Center, Florida. The system was retired from service in 2011 after 135 missions, the program ended after Atlantis landed at the Kennedy Space Center on July 21,2011. Major missions included launching numerous satellites and interplanetary probes, conducting space science experiments, the first orbiter vehicle, named Enterprise, was built for the initial Approach and Landing Tests phase and lacked engines, heat shielding, and other equipment necessary for orbital flight. A total of five operational orbiters were built, and of these and it was used for orbital space missions by NASA, the US Department of Defense, the European Space Agency, Japan, and Germany. The United States funded Shuttle development and operations except for the Spacelab modules used on D1, sL-J was partially funded by Japan
10.
Buran programme
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The Buran-class space shuttle orbiters used the expendable Energia rocket as a launch vehicle. The Buran programme was started by the Soviet Union as a response to the United States Space Shuttle program, the project was the largest and the most expensive in the history of Soviet space exploration. Development work included sending BOR-5 test vehicles on multiple sub-orbital test flights, Buran completed one unmanned orbital spaceflight in 1988 before its cancellation in 1993. Orbiter K1, which flew the test flight in 1988 was crushed in a collapse on 12 May 2002 in Kazakhstan. The OK-GLI resides in Technikmuseum Speyer, although Soviet/Russian Buran spacecraft was similar in appearance to NASAs Space Shuttle, and could similarly operate as a re-entry spaceplane, its internal and functional design was distinct. For example, the engines during launch were on the Energia rocket and were not taken into orbit by the spacecraft. Smaller rocket engines on the body provided propulsion in orbit. The Buran orbital vehicle programme was developed in response to the U. S, Space Shuttle programme, which in the 1980s raised considerable concerns among the Soviet military and especially Defense Minister Dmitriy Ustinov. An authoritative chronicler of the Soviet and later Russian space programmes, the Soviet government asked the TsNIIMash for an expert opinion. Institute director, Yuri Mozzhorin, recalls that for a time the institute could not envisage a civilian payload large enough to require a vehicle of that capacity. Officially, the Buran orbital vehicle was designed for the delivery to orbit and return to Earth of spacecraft, cosmonauts, before the Mriya was ready, the Myasishchev VM-T Atlant, a variant on the Soviet Myasishchev M-4 Molot bomber, fulfilled the same role. The Soviet reusable space-craft programme has its roots in the beginning of the space age. The idea of Soviet reusable space flight is very old, though it was neither continuous, before Buran, no project of the programme reached production. The idea saw its first iteration in the Burya high-altitude jet aircraft, several test flights are known, before it was cancelled by order of the Central Committee. The Burya had the goal of delivering a nuclear payload, presumably to the United States, the cancellation was based on a final decision to develop ICBMs. The next iteration of the idea was Zvezda from the early 1960s, decades later, another project with the same name was used as a service module for the International Space Station. After Zvezda, there was a hiatus in reusable projects until Buran, the development of the Buran began in the early 1970s as a response to the U. S. Soviet officials were concerned about a military threat posed by the U. S
11.
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
12.
Stabilizer (aeronautics)
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An aircraft stabilizer is an aerodynamic surface, typically including one or more movable control surfaces, that provides longitudinal and/or directional stability and control. A stabilizer can feature a fixed or adjustable structure on which any movable control surfaces are hinged, depending on the context, stabilizer may sometimes describe only the front part of the overall surface. In the conventional configuration, separate vertical and horizontal stabilizers form an empennage positioned at the tail of the aircraft. Other arrangements of the empennage, such as the V-tail configuration, feature stabilizers which contribute to a combination of longitudinal and directional stabilization, Longitudinal stability and control may be obtained with other wing configurations, including canard, tandem wing and tailless aircraft. Some types of aircraft are stabilized with electronic control, in this case, fixed. Transonic flight makes special demands on horizontal stabilizers, since the crossing of the barrier is associated with a sudden move aft of the center of lift. Another role of a stabilizer is to provide longitudinal static stability. Stability can be defined only when the vehicle is in trim and this maintains a constant aircraft attitude, with unchanging pitch angle relative to the airstream, without active input from the pilot. The elevator serve to control the pitch axis, in case of a movable tail. In the conventional configuration the horizontal stabilizer is a horizontal tail or tailplane located to the rear of the aircraft. This is the most common configuration, on many aircraft, the tailplane assembly consists of a fixed surface fitted with a hinged aft elevator surface. Trim tabs may be used to pilot input forces, conversely in some cases, such as small aircraft with all-moving stabilizers. Most airliners and transport aircraft feature a large, slow-moving trimmable tail plane which is combined with independently-moving elevators. The elevators are controlled by the pilot or autopilot and primarily serve to change the attitude, while the whole assembly is used to trim. Many supersonic aircraft feature an all-moving tail assembly, also named stabilator, variants on the conventional configuration include the T-tail, Cruciform tail, Twin tail and Twin-boom mounted tail. Three-surface aircraft such as the Piaggio P, lacking elevators, the tailplanes of these aircraft were not what is now called conventional stabilizers. For example, the Voisin was a layout with a foreplane that was neither stabilizing nor mainly lifting, it was called an équilibreur. In the canard configuration, a wing, or foreplane, is located in front of the main wing
