Assertion: helicopter's rotor | /r/HasProperty | driven by its engine
Facets:
value: for landing
type: PURPOSE
value: normally
type: DEGREE
value: for takeoff
type: PURPOSE
Source sentences:
text: The rotor of a gyrodyne is normally driven by its engine for takeoff and landing – hovering like a helicopter – with anti-torque and propulsion for forward flight provided by one or more propellers mounted on short or stub wings.