1.
Yamaha Motor Corporation
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Yamaha Motor Company Limited is a Japanese manufacturer of motorcycles, marine products such as boats and outboard motors, and other motorized products. The company was established in 1955 upon separation from Yamaha Corporation, the company conducts development, production and marketing operations through 109 consolidated subsidiaries as of 2012. Led by Genichi Kawakami, the company’s first president, Yamaha Motor began production of its first product, Yamahas initial product was a 125cc two-cycle, single cylinder motorcycle, the YA-1, which was a copy of the German DKW RT125. Yamaha began competing internationally in 1956 when they entered the Catalina Grand Prix, again with the YA-1, the YA-1 was followed by the YA-2 of 1957, another 125cc two stroke, but with significantly improved frame and suspension. The YD-1 of 1957 was a 250cc two-stroke twin cylinder motorcycle, resembling the YA-2, a performance version of this bike, the YDS-1 housed the 250cc two-stroke twin in a double downtube cradle frame and offered the first five-speed transmission in a Japanese motorcycle. This period also saw Yamaha offer its first outboard marine engine, by 1963 Yamahas dedication to both the two-stroke engine and racing paid off with their first victory in international competition, at the Belgium GP, where they won the 250cc class. Success in sales was even more impressive, and Yamaha set up the first of its subsidiaries in this period beginning with Thailand in 1964. 1965 saw the release of a 305cc two-stroke twin, the flagship of the companies lineup and it featured a separate oil supply which directly injected oil into the gasoline prior to combustion. In 1967 a new larger displacement model was added to the range, in 1968 Yamaha launched their first four-stroke motorcycle, the XS-1. Not until 1976 would Yamaha answer the other Japanese brands with a four stroke of their own. The XS-750 a 750cc triple cylinder machine with shaft drive was introduced almost seven years after Hondas breakthrough bike. Yamahas first four-cylinder model, the XS-1100 followed in 1978, again with shaft drive, despite being heavier and more touring oriented than its rivals it produced an impressive string of victories in endurance racing. The 1970s also saw some of the first dedicated off-road bikes for off-road racing, Yamaha was an early innovator in dirt-bike technology, and introduced the first single-shock rear suspension, the trademarked Monoshock of 1973. It appeared in production on the 1974 Yamaha YZ-250, a model which has continued in production, with updates, until 2015, making it Yamahas longest continuous model. Yamaha continued racing throughout the 1960s and 1970s with increasing success in several formats, the decade of the 1970s was capped by the XT500 winning the first Paris-Dakar Rally in 1979. By 1980 the combination of consumer preference and environmental regulation made four strokes increasingly popular, suzuki ended production of their GT two stroke series, including the flagship water-cooled two-stroke 750cc GT-750 in 1977. Kawasaki, who had success throughout the 1970s with their two-stroke triples of 250cc, 350cc, 500cc and 750cc ended production of road-going two strokes in 1980. Yamaha bucked this trend and continued to refine and sell two-strokes for the street into the 1980s and these bikes were performance oriented, water-cooled twin cylinder machines, designed to achieve excellent performance taking advantage of the lower weight of two strokes
2.
Boat
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A boat is a watercraft of a large range of sizes designed to float, plane, work or travel on water. Small boats are found on inland waterways or in protected coastal areas. However, boats such as the whaleboat were designed for operation from a ship in an offshore environment, in naval terms, a boat is a vessel small enough to be carried aboard another vessel. Another less restrictive definition is a vessel that can be lifted out of the water, some definitions do not make a distinction in size, as bulk freighters 1,000 feet long on the Great Lakes are called oreboats. For reasons of tradition, submarines are usually referred to as boats rather than ships, regardless of their size. Ships are generally distinguished from boats based on their size, shape. Boats have a variety of shapes, sizes and construction methods due to their intended purpose. Canoe-type boats have used since prehistoric times and various versions are used throughout the world for transportation. Fishing boats vary widely in style partly to local conditions. Pleasure boats include ski boats, pontoon boats, and sailboats, house boats may be used for vacationing or long-term housing. Small boats can provide transport or convey cargo to and from large ships, lifeboats have rescue and safety functions. Boats can be powered by power, wind power and motor power. Dugouts are the oldest type of boats found by archaeologists, the earliest boats are thought to have been logboats, and the oldest boats found by archaeological excavation date from around 7, 000–10,000 years ago. The oldest recovered boat in the world is the Pesse canoe and this canoe is exhibited in the Drents Museum in Assen, Netherlands. Other very old dugout boats have also been recovered, rafts have operated for at least 8,000 years. A7, 000-year-old seagoing reed boat has been found in Kuwait, boats were used between 4000 and 3000 BC in Sumer, ancient Egypt and in the Indian Ocean. Boats played an important role in the commerce between the Indus Valley Civilization and Mesopotamia, evidence of varying models of boats has also been discovered at various Indus Valley archaeological sites. Uru craft originate in Beypore, a village in south Calicut, Kerala and this type of mammoth wooden ship was constructed using teak, without any iron, and had a transport capacity of 400 tonnes
3.
Motorboat
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A motorboat, speedboat, or powerboat is a boat which is powered by an engine. Some motorboats are fitted with engines, others have an outboard motor installed on the rear, containing the internal combustion engine, the gearbox. An inboard-outboard contains a hybrid of a powerplant and an outboard, where the combustion engine is installed inside the boat. There are two configurations of an inboard, V-drive and direct drive, the V-drive has become increasingly popular due to wakeboarding and wakesurfing. Motorboats vary greatly in size and configuration, from the four-meter, the earliest boat to be powered by a petrol engine was tested on the Neckar River by Gottlieb Daimler and Wilhelm Maybach in 1886, when they tested their new longcase clock engine. It had been constructed in the greenhouse in Daimlers back yard. The first public display took place on the Waldsee in Cannstatt, today a suburb of Stuttgart, the engine of this boat had a single cylinder of 1 horse power. Daimlers second launch in 1887 had a second cylinder positioned at an angle of 15 degrees to the first one, the first successful motor boat was designed by the Priestman Brothers in Hull, England, under the direction of William Dent Priestman. The company began trials of their first motorboat in 1888, the engine was powered with kerosene and used an innovative high-tension ignition system. The company was the first to large scale production of the motor boat. Working in the garden of their home in Olton, Warwickshire, they designed, in 1897, he produced a second engine similar in design to his previous one but running on benzene at 800 r. p. m. The engine drove a reversible propeller, an important part of his new engine was the revolutionary carburettor, for mixing the fuel and air correctly. His invention was known as a carburetor, because fuel was drawn into a series of wicks. He patented this invention in 1905, the Daimler Company began production of motor boats in 1897 from its manufacturing base in Coventry. The engines had two cylinders and the charge of petroleum and air was ignited by compression into a heated platinum tube. The engine gave about six horse-power, the petrol was fed by air pressure to a large surface carburettor and also an auxiliary tank which supplied the burners for heating the ignition tubes. It was not until 1901 that a safer apparatus for igniting the fuel with a spark was used in motor boats. Interest in fast motorboats grew rapidly in the years of the 20th century
4.
Propeller
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A propeller is a type of fan that transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the blade, and a fluid is accelerated behind the blade. Their disadvantages are higher mechanical complexity and higher cost, the principle employed in using a screw propeller is used in sculling. It is part of the skill of propelling a Venetian gondola but was used in a less refined way in parts of Europe. For example, propelling a canoe with a paddle using a pitch stroke or side slipping a canoe with a scull involves a similar technique. In China, sculling, called lu, was used by the 3rd century AD. In sculling, a blade is moved through an arc. The innovation introduced with the propeller was the extension of that arc through more than 360° by attaching the blade to a rotating shaft. Propellers can have a blade, but in practice there are nearly always more than one so as to balance the forces involved. The origin of the screw propeller starts with Archimedes, who used a screw to lift water for irrigation and bailing boats and it was probably an application of spiral movement in space to a hollow segmented water-wheel used for irrigation by Egyptians for centuries. Leonardo da Vinci adopted the principle to drive his theoretical helicopter, in 1784, J. P. Paucton proposed a gyrocopter-like aircraft using similar screws for both lift and propulsion. At about the time, James Watt proposed using screws to propel boats. This was not his own invention, though, Toogood and Hays had patented it a century earlier, by 1827, Czech-Austrian inventor Josef Ressel had invented a screw propeller which had multiple blades fastened around a conical base. He had tested his propeller in February 1826 on a ship that was manually driven. He was successful in using his bronze screw propeller on an adapted steamboat and his ship Civetta with 48 gross register tons, reached a speed of about six knots. This was the first ship successfully driven by an Archimedes screw-type propeller, after a new steam engine had an accident his experiments were banned by the Austro-Hungarian police as dangerous. Josef Ressel was at the time a forestry inspector for the Austrian Empire, but before this he received an Austro-Hungarian patent for his propeller. This new method of propulsion was an improvement over the paddlewheel as it was not so affected by either ship motions or changes in draft as the burned coal
5.
Intake
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An intake or inlet is an opening on a car or aircraft body capturing air for operation of an internal combustion engine. An ideal intake system should increase the velocity of the air until it travels into the chamber, while minimizing turbulence. However, in aircraft, particularly supersonic aircraft, the purpose of the intake is to slow, early automobile intake systems were simple air inlets connected directly to carburetors. The first air filter was implemented on the 1915 Packard Twin Six, the modern automobile air intake system has three main parts, an air filter, mass flow sensor, and throttle body. Some modern intake systems can be complex, and often include specially-designed intake manifolds to optimally distribute air. Many cars today now include a silencer to minimize the noise entering the cabin, silencers impede air flow and create turbulence which reduce total power, so performance enthusiasts often remove them. All the above is accomplished by flow testing on a flow bench in the port design stage. Cars with turbochargers or superchargers which provide pressurized air to the engine usually have highly refined intake systems to improve performance dramatically, production cars have specific-length air intakes to cause the air to vibrate and buffet at a specific frequency to assist air flow into the combustion chamber. These designs became more complex as aircraft speeds increased to Mach 3.0 and Mach 3.2, design points for the XB-70, the inlet is part of the fuselage or part of the nacelle. Cold air intake Warm air intake Short ram air intake Ram-air intake Intake ramp Inlet manifold
6.
Pump-jet
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A pump-jet, hydrojet, or water jet is a marine system that creates a jet of water for propulsion. The mechanical arrangement may be a ducted propeller, a centrifugal pump, the design also incorporates an intake to provide water to the pump and a nozzle to direct the flow of water out of the pump. A pump-jet works by having an intake that allows water to pass underneath the vessel into the engines, Water enters the pump through this inlet. The pump can be of a design for high speeds. The water pressure inside the inlet is increased by the pump, with the use of a reversing bucket, reverse thrust can also be achieved for faring backwards, quickly and without the need to change gear or adjust engine thrust. The reversing bucket can also be used to slow the ship down when braking. This feature is the main reason pump jets are so maneuverable, the nozzle also provides the steering of the pump-jets. Plates, similar to rudders, can be attached to the nozzle in order to redirect the water flow port and starboard. In a way, this is similar to the principles of air thrust vectoring and this provides pumpjet-powered ships with superior agility at sea. Another advantage is that when faring backwards by using the bucket, steering is not inverted. An axial-flow waterjets pressure is increased by diffusing the flow as it is passes through the impeller blades, the pump nozzle then converts this pressure energy into velocity, thus producing thrust. But these craft also have high power-to-weight ratios compared to most marine craft, axial-flow waterjets are by far the most common type of pump. Mixed-flow waterjet designs incorporate aspects of both Axial flow and Centrifugal flow concepts, pressure is developed by both diffusion and radial outflow. Mixed flow designs produce lower volumes of water at high velocity making them suited for small to moderate craft sizes, common uses include high speed pleasure craft, and waterjets for shallow water river racing. Centrifugal-flow waterjet designs make use of flow to create water pressure. Centrifugal designs are not commonly used anymore except on outboard sterndrives, pump jets have some advantages over bare propellers for certain applications, usually related to requirements for high-speed or shallow-draft operations. Modern torpedoes, such as the Spearfish, the Mk 48, disadvantages of pump-jets include, Can be less efficient than a propeller at low speed More expensive The intake grill can become clogged with debris, e. g. seaweed. The effects of this can be mitigated by having a reversing gearbox between the engine and the water jet, the Italian inventor Secondo Campini showed the first functioning man-made pump-jet engine in Venice in 1931
7.
Nozzle
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A nozzle is a device designed to control the direction or characteristics of a fluid flow as it exits an enclosed chamber or pipe. A nozzle is often a pipe or tube of varying cross sectional area, Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them. In a nozzle, the velocity of fluid increases at the expense of its pressure energy, a gas jet, fluid jet, or hydro jet is a nozzle intended to eject gas or fluid in a coherent stream into a surrounding medium. Gas jets are found in gas stoves, ovens, or barbecues. Gas jets were used for light before the development of electric light. Other types of jets are found in carburetors, where smooth calibrated orifices are used to regulate the flow of fuel into an engine. Another specialized jet is the laminar jet and this is a water jet that contains devices to smooth out the pressure and flow, and gives laminar flow, as its name suggests. This gives better results for fountains, the foam jet is another type of jet which uses foam instead of a gas or fluid. Nozzles used for feeding hot blast into a blast furnace or forge are called tuyeres, jet nozzles are also used in large rooms where the distribution of air via ceiling diffusers is not possible or not practical. Diffusers that uses jet nozzles are called jet diffuser where it will be arranged in the wall areas in order to distribute air. When the temperature difference between the air and the room air changes, the supply air stream is deflected upwards, to supply warm air, or downwards. Frequently, the goal of a nozzle is to increase the energy of the flowing medium at the expense of its pressure. Nozzles can be described as convergent or divergent, a de Laval nozzle has a convergent section followed by a divergent section and is often called a convergent-divergent nozzle. If the nozzle pressure ratio is high enough, then the flow will reach sonic velocity at the narrowest point, in this situation, the nozzle is said to be choked. Increasing the nozzle pressure ratio further will not increase the throat Mach number above one. Downstream the flow is free to expand to supersonic velocities, however Mach 1 can be a high speed for a hot gas because the speed of sound varies as the square root of absolute temperature. This fact is used extensively in rocketry where hypersonic flows are required, divergent nozzles slow fluids if the flow is subsonic, but they accelerate sonic or supersonic fluids. Convergent-divergent nozzles can therefore accelerate fluids that have choked in the convergent section to supersonic speeds and this CD process is more efficient than allowing a convergent nozzle to expand supersonically externally
8.
Stern
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The stern is the back or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite of the bow, the foremost part of a ship, originally, the term only referred to the aft port section of the ship, but eventually came to refer to the entire back of a vessel. The stern end of a ship is indicated with a navigation light at night. Sterns on European and American wooden sailing ships began with two forms, the square or transom stern and the elliptical, fantail, or merchant stern. This frame is designed to support the beams that make up the stern. In 1817 the British naval architect Sir Robert Seppings first introduced the concept of the round or circular stern, the square stern had been an easy target for enemy cannon, and could not support the weight of heavy stern chase guns. The United States began building the first elliptical stern warship in 1820, USS Brandywine became the first sailing ship to sport such a stern. In naval architecture, the term transom has two meanings, in this sense, a transom stern is the product of the use of a series of transoms, and hence the two terms have blended. But until a new form of stern appeared in the 19th century, the stern was a floating house—and required just as many timbers, walls, windows. The stern frame provided the structure of the transom stern, and was composed of the sternpost, wing transom. If the stern had transoms above the transom, they would no longer be affixed to the sternpost. The first of these might be called a counter transom, next up was the window sill transom, above that, the larger the vessel, the more numerous and wider the transoms required to support its stern. Stern timbers – These timbers are mounted vertically in a series, each timber typically rests or steps on the transom and then stretches out. Those not reaching all the way to the taffrail are called short stern timbers, the two outermost of these timbers, located at the corners of the stern, are called the side-counter timbers or outer stern timbers. The flat surface of any transom stern may begin either at or above the waterline of the vessel. The geometric line which stretches from the transom to the archboard is called the counter. The visual unpopularity of Seppings circular stern was soon rectified by Sir William Symonds, in this revised stern, a set of straight post timbers stretches from the keel diagonally aft and upward. It rests on the top of the sternpost and runs on either side of the rudder post to a point well above the vessels waterline, the finished stern has a continuous curved edge around the outside and is raked aft
9.
New Zealand
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New Zealand /njuːˈziːlənd/ is an island nation in the southwestern Pacific Ocean. The country geographically comprises two main landmasses—the North Island, or Te Ika-a-Māui, and the South Island, or Te Waipounamu—and around 600 smaller islands. New Zealand is situated some 1,500 kilometres east of Australia across the Tasman Sea and roughly 1,000 kilometres south of the Pacific island areas of New Caledonia, Fiji, because of its remoteness, it was one of the last lands to be settled by humans. During its long period of isolation, New Zealand developed a distinct biodiversity of animal, fungal, the countrys varied topography and its sharp mountain peaks, such as the Southern Alps, owe much to the tectonic uplift of land and volcanic eruptions. New Zealands capital city is Wellington, while its most populous city is Auckland, sometime between 1250 and 1300 CE, Polynesians settled in the islands that later were named New Zealand and developed a distinctive Māori culture. In 1642, Dutch explorer Abel Tasman became the first European to sight New Zealand, in 1840, representatives of Britain and Māori chiefs signed the Treaty of Waitangi, which declared British sovereignty over the islands. In 1841, New Zealand became a colony within the British Empire, today, the majority of New Zealands population of 4.7 million is of European descent, the indigenous Māori are the largest minority, followed by Asians and Pacific Islanders. Reflecting this, New Zealands culture is derived from Māori and early British settlers. The official languages are English, Māori and New Zealand Sign Language, New Zealand is a developed country and ranks highly in international comparisons of national performance, such as health, education, economic freedom and quality of life. Since the 1980s, New Zealand has transformed from an agrarian, Queen Elizabeth II is the countrys head of state and is represented by a governor-general. In addition, New Zealand is organised into 11 regional councils and 67 territorial authorities for local government purposes, the Realm of New Zealand also includes Tokelau, the Cook Islands and Niue, and the Ross Dependency, which is New Zealands territorial claim in Antarctica. New Zealand is a member of the United Nations, Commonwealth of Nations, ANZUS, Organisation for Economic Co-operation and Development, Pacific Islands Forum, and Asia-Pacific Economic Cooperation. Dutch explorer Abel Tasman sighted New Zealand in 1642 and called it Staten Landt, in 1645, Dutch cartographers renamed the land Nova Zeelandia after the Dutch province of Zeeland. British explorer James Cook subsequently anglicised the name to New Zealand, Aotearoa is the current Māori name for New Zealand. It is unknown whether Māori had a name for the country before the arrival of Europeans. Māori had several names for the two main islands, including Te Ika-a-Māui for the North Island and Te Waipounamu or Te Waka o Aoraki for the South Island. Early European maps labelled the islands North, Middle and South, in 1830, maps began to use North and South to distinguish the two largest islands and by 1907, this was the accepted norm. The New Zealand Geographic Board discovered in 2009 that the names of the North Island and South Island had never been formalised and this set the names as North Island or Te Ika-a-Māui, and South Island or Te Waipounamu
