Assertion: rotor | /r/CapableOf | rotate in opposite directions
Facets:
value: typically
type: DEGREE
Source sentences:
text: Also, because the rotors must rotate in opposite directions, the mast is more complex, and control linkages for pitch changes to the upper rotor system must pass through the lower rotor system.
text: These typically rotate in opposite directions cancelling the torque reaction so that no tail rotor or other yaw stabiliser is needed.