Assertion: helicopter | /r/CapableOf | use tail rotors
Facets:
value: to counterbalance rotating force
type: PURPOSE
value: to counterbalance the torque
type: PURPOSE
Source sentences:
text: Earlier helicopters used tail rotors to counterbalance the torque, or rotating force, generated by a single, main rotor.
text: To offset this reaction, many helicopters use a tail rotor, an exposed blade or ducted fan mounted on the end of the tail boom typically seen on these craft.