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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.
The de Bothezat helicopter, also known as the Jerome-de Bothezat Flying Octopus, [1] was an experimental quadrotor helicopter built for the United States Army Air Service by George de Bothezat in the early 1920s, and was said at the time to be the first successful helicopter. Although its four massive six-bladed rotors allowed the craft to fly ...
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]
Abrasion strips on helicopter rotor blades are made of metal, often titanium or nickel, which are very hard, but less hard than sand. When a helicopter flies low to the ground in desert environments, sand striking the rotor blade can cause erosion. At night, sand hitting the metal abrasion strip causes a visible corona or halo around the rotor ...
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.
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 ...
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