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Flettner Fl 185 : ウィキペディア英語版
Flettner Fl 185

The Flettner Fl 185 was an experimental German gyrodyne developed by Anton Flettner, a machine which could fly both as a helicopter and as a gyroplane.
==Design and development==
This aircraft was developed in 1936 with support of the German Navy. It was powered by a BMW-Bramo Sh 14 A radial piston engine with forced-air cooling, mounted at the nose. The engine drove a 12 m diameter main rotor and two auxiliary propellers mounted on outriggers attached to the fuselage.
At take-off or when hovering, the auxiliary propellers worked in opposition to each other and served to cancel the torque of the main rotor, a function handled by a single, variable-pitch tail rotor on contemporary helicopters. In forward flight, however, both propellers worked to provide forward thrust while the rotor autorotated, as in a twin-engined autogyro. The landing gear consisted of a nosewheel, two smaller stabilising wheels under the outriggers and a tail skid. Only one prototype was constructed.

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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