Autorotation is a state of flight where 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 wi...
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http://en.wikipedia.org/wiki/Autorotation
[fixed-wing aircraft] For fixed-wing aircraft, autorotation is the tendency of an aircraft in or near a stall to roll spontaneously to the right or left, leading to a spin (a state of continuous autorotation). ==Autorotation in fixed-wing aircraft== When the angle of attack is less than the stalling angle any increase in angle of attack cau...
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http://en.wikipedia.org/wiki/Autorotation_(fixed-wing_aircraft)
the condition of flight occurring when lift is derived solely from the action of air upon the unpowered rotor of a moving helicopter or autogiro.
Found on
https://www.infoplease.com/dictionary/autorotation
No exact match found.
