Assertion: helicopter's rotor | /r/HasProperty | driven by aerodynamic forces
Facets:
value: in a state of autorotation
type: OTHER
value: to develop lift
type: PURPOSE
Source sentences:
text: An autogyro (sometimes called gyrocopter, gyroplane, or rotaplane) utilizes an unpowered rotor, driven by aerodynamic forces in a state of autorotation to develop lift, and an engine-powered propeller, similar to that of a fixed-wing aircraft, to provide thrust.