Assertion: coaxial rotor | /r/CapableOf | turn in opposite directions
Facets:
Source sentences:
text: Coaxial rotors are a pair of rotors mounted one above the other on the same shaft and turning in opposite directions.
text: Coaxial rotors or coax rotors are a pair of helicopter rotors mounted one above the other on concentric shafts, with the same axis of rotation, but turning in opposite directions (contra-rotating).