A coaxial-rotor aircraft is an aircraft whose rotors are mounted on concentric shafts with the same axis of rotation but turn in opposite directions (contra-rotating). This is done to offset the yawing movement that one rotor imparts on the aircraft.
A coaxial-rotor aircraft is an aircraft whose rotors are mounted on concentric shafts with the same axis of rotation but turn in opposite directions (contra-rotating). This is done to offset the yawing movement that one rotor imparts on the aircraft.
Source: Wikipedia "Coaxial-rotor aircraft" · CC BY-SA 4.0
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