Autorotation is a state of flight where the main rotor system of a helicopter or similar aircraft (such as the V-22 Osprey) turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor.Charnov, Bruce H.

Autorotation
Autonomous Autorotation of an RC Helicopter
Autonomous Autorotation of an RC Helicopter
Autonomous Autorotation of an RC Helicopter
Flutter, Tumble and Vortex Induced Autorotation
Vestibular autorotation testing in patients with benign paroxysmal positional vertigo.
Autorotation test abnormalities of the horizontal and vertical vestibulo-ocular reflexes in panic disorder
AUTOROTATION, SELF‐STABILITY, AND STRUCTURE OF SINGLE‐WINGED FRUITS AND SEEDS (SAMARAS) WITH COMPARATIVE REMARKS ON ANIMAL FLIGHT
Comparison of head thrust test with head autorotation test reveals that the vestibulo-ocular reflex is enhanced during voluntary hea...
Nonlinear Model Predictive Control With Neural Network Optimization for Autonomous Autorotation of Small Unmanned Helicopters