Assertion: helicopter's rotor | /r/HasProperty | powered
Facets:
value: during take-off
type: TEMPORAL
value: during landing
type: TEMPORAL
Source sentences:
text: Because the rotor is powered, there is an equal and opposite torque reaction, which tends to rotate the fuselage in a direction opposite to the rotor.
text: A different British VTOL project was the gyrodyne, where a rotor is powered during take-off and landing but which then freewheels during flight, with separate propulsion engines providing forward thrust.