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Gliding flight is heavier-than-air flight without the use of thrust; the term volplaning also refers to this mode of flight in animals.〔(volplane ). The Free Dictionary.〕 It is employed by gliding animals and by aircraft such as gliders. This mode of flight involves flying a greater distance horizontally than vertically and therefore can be distinguished from a simple descent like with a round parachute. Although the human application of gliding flight usually refers to aircraft designed for this purpose, most powered aircraft are capable of gliding without engine power. As with sustained flight, gliding generally requires the application of an airfoil, such as the wings on aircraft or birds, or the gliding membrane on gliding possum. However, gliding can be achieved with a flat (uncambered) wing, as with a simple paper plane, or even with card-throwing. However some aircraft with lifting bodies and animals such as the flying snake can achieve gliding flight without any wings by creating a flattened surface underneath. ==Aircraft ("gliders")== (詳細はGlider, also known as a sailplane * Hang glider * Paraglider * Speed glider * Ram-air parachute * Rotor kite, if untethered, known as a rotary glider, or gyroglider. * Military glider * Paper aeroplane * Radio-controlled glider * Rocket glider The main human application is currently recreational, though during the Second World War military gliders were used for carrying troops and equipment into battle. The types of aircraft that are used for sport and recreation are classified as gliders (sailplanes), hang gliders and paragliders. These two latter types are often foot-launched. The design of all three types enables them to repeatedly climb using rising air and then to glide before finding the next source of lift. When done in gliders (sailplanes), the sport is known as gliding and sometimes as soaring. For foot-launched aircraft, it is known as hang gliding and paragliding. Radio-controlled gliders with fixed wings are also soared by enthusiasts. In addition to motor gliders, some powered aircraft are designed for routine glides during part of their flight; usually when landing after a period of a powered flight. These include: * Experimental aircraft such as the North American X-15, which glided back having used their fuel * Spacecraft such as the Space Shuttles, SpaceShipOne and the Russian Buran Some aircraft are not primarily designed to glide except in an emergency, for example airliners that have run out of fuel. See list List of airline flights that required gliding flight. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gliding flight」の詳細全文を読む スポンサード リンク
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