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Breguet-Dorand Gyroplane Laboratoire
The Gyroplane Laboratoire was an early helicopter. Its designer, Frenchman Louis Breguet, had already experimented with rotorcraft in 1909, however, he chose to concentrate on airplanes until the end of the 1920s. In 1929 he announced a set of patents which addressed the flight stabilization of rotorcraft, and, in 1931, Breguet created the ''Syndicat d'Etudes de Gyroplane'' (French for "Syndicate for Gyroplane Studies"), together with Rene Dorand as technical director. Their goal was the development of an experimental helicopter, the Gyroplane Laboratoire.
==Design==
The aircraft consisted of an open steel tube framework, within which the engine, fuel tank, controls and pilot were situated, together with a tail assembly with plywood tail surfaces. The tail wheel landing gear was installed with the main wheels on outriggers and with an additional small wheel at the front to avoid nosing-over during landing. Power was provided by a 240 HP Hispano radial engine which propelled the two contra-rotating, coaxial rotors. The coaxial rotor design was chosen because with the rotors turning in opposite directions the torque from one rotor was canceled out by the torque produced by the other rotor.
The two, twin-bladed rotors made of metal were shaped like arrows and incorporated both cyclic and collective pitch blade control, with which movement around the pitch and roll axis was controlled, as well as climb and descent.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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