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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.
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.
The WGM.21 is an open cockpit quadrotor. Four rotors are mounted at the end of a four tubular supports arranged into a X shape. Cyclic and collective controls are mixed into a single control yoke.
The Focke-Wulf Fw 61 was the first successful, practical, and fully controllable helicopter in 1936, while in 1942, the Sikorsky R-4 became the first helicopter to reach full-scale production. Starting in 1939 and through 1943, Igor Sikorsky worked on the development of the VS-300 , which over four iterations, became the basis for modern ...
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.
Cassidy and Hensley both had an expert helicopter pilot take over for them in the actual helicopter flight sequences; this regular stunt pilot was Charles 'Chuck' Tamburro who wore a wig to give the appearance of a female pilot. Matthew Perry's first credited role was a small part in the show, where he played a child actor in a 1979 episode. [2]
Unlike single- and double-rotor helicopters which use complex variable pitch rotors whose pitch varies as the blade rotates for flight stability and control, multirotors often use fixed-pitch blades; control of vehicle motion is achieved by varying the relative speed of each rotor to change the thrust and torque produced by each.
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 ...