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Top view of de Bothezat helicopter as depicted in US Pat. 1,749,471. Self-described as "the world's greatest scientist and outstanding mathematician", [2] and having written one of the first scientific papers on the aerodynamics of rotary-wing flight, [1] [N 1] George de Bothezat was a refugee from the Russian Empire who had fled to the United States in the wake of the Russian Revolution.
A quadcopter, also called quadrocopter, or quadrotor [1] is a type of helicopter or multicopter that has four rotors. [ 2 ] Although quadrotor helicopters and convertiplanes have long been flown experimentally, the configuration remained a curiosity until the arrival of the modern unmanned aerial vehicle or drone.
The Curtiss-Wright VZ-7 (also known as the VZ-7AP [1]) was a VTOL quadrotor helicopter aircraft designed by the Curtiss-Wright company for the US Army. Like the Chrysler VZ-6 and the VZ-8 Airgeep it was to be a "flying jeep".
The helicopter was tested at McCook's Field and remained airborne for 2 minutes and 45 seconds at a height of 15 feet. [61] On 14 April 1924, Frenchman Étienne Oehmichen set the first helicopter world record recognized by the Fédération Aéronautique Internationale (FAI), flying his quadrotor helicopter 360 meters (1,180 ft). [62]
The Helicopters. "The Epic of Flight". Chicago: Time-Life Books, 1982. ISBN 0-8094-3350-8. The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing. Lacaze, Henri (2016). Les avions Louis Breguet Paris [The Aircraft of Louis Breguet, Paris] (in French). Vol. 2: le règne du monoplan. Le Vigen, France.
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The Gamera I is purpose-designed quadrotor helicopter to meet the criteria of the 1980 Sikorsky Prize. Two other teams have made prize attempts unsuccessfully, The Da Vinci III, built by a team at the California Polytechnic State University in 1989 and the Yuri I. [2] At the time the world record was of 19.46 seconds of flight at 0.2 m (7.9 in) altitude made by the Yuri I helicopter developed ...
The Aerotechnik WGM.21 is a quadrotor helicopter that was developed in the 1970s. Design and development. The WGM.21 is an open cockpit quadrotor. Four rotors are ...