1. 
   Autorotation
   [helicopter] Autorotation is the state of flight where the main rotor system of a helicopter is being turned by the action of air moving up through the rotor rather than engine power driving the rotor, as with an autogyro. The term autorotation can be traced back to a period of early develop...
   Found op http://en.wikipedia.org/wiki/Autorotation_(helicopter)
   
   
2. 
   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 ...
   Found op http://en.wikipedia.org/wiki/Autorotation_(fixed-wing_aircraft)
   
   

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