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Paper airplanes are known to have been made as far back as the mid 19th century, based on an American children's book describing their construction from 1864. [ 2 ] The construction of a paper airplane, by Ludwig Prandtl at the 1924 banquet of the International Union of Theoretical and Applied Mechanics , was dismissed as an artless exercise by ...
The KF airfoil was designed by Richard Kline and Floyd Fogleman. Aircraft wing showing the KFm4 Step. In the early 1960s, Richard Kline wanted to make a paper airplane that could handle strong winds, climb high, level off by itself and then enter a long downwards glide.
The developers continued through 2009, with hopes that China or Russia would back further efforts on the project. [5] Some 30 [4] to 100 [5] planes had been considered to make the descent, each gliding downward over what was expected to be the course of a week to several months. If one of the planes survived to Earth it would have made the ...
Image credits: Sasha Weilbaker #4 Wind Blades. Humpback Whales are one of the largest weighing animals of the world, yet they are profound swimmers, which attributes down to its flippers (fins).
At 3,100 m (10,200 ft), 45 km (28 mi) offshore, engine 4 also lost power. Plane underwent belly landing on ground near Paphos, Cyprus, after 45 km (28 mi) glide. 0: 100 21 August 1963 Aeroflot Flight 366: Tupolev Tu-124: Leningrad, Russia Fuel exhaustion
A glider's glide ratio varies with airspeed, but there is a maximum value which is frequently quoted. Glide ratio usually varies little with vehicle loading; a heavier vehicle glides faster, but nearly maintains its glide ratio. [21] Glide ratio (or "finesse") is the cotangent of the downward angle, the glide angle (γ). Alternatively it is ...
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Single-seat high performance fiberglass Glaser-Dirks DG-808 glider Aerobatic glider with tip smoke, pictured on July 2, 2005, in Lappeenranta, Finland. A glider is a fixed-wing aircraft that is supported in flight by the dynamic reaction of the air against its lifting surfaces, and whose free flight does not depend on an engine. [1]
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