Autorotation - Landing a Helicopter without Engine Power UH-1D
Full down autorotation with MD-500E from Hungarian Air Police, Siófok-Kiliti
HH-60 Blackhawk | Auto-Rotation Practice
Autorotation is a state of flight in which the main rotor system of a helicopter or similar aircraft turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor. The term autorotation dates to a period of early helicopter development between 1915 and 1920, and refers to the rotors turning without the engine. It is analogous to the gliding flight of a fixed-wing aircraft.
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