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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. Benefits of this system also include avoiding the dissymmetry of lift problem, reduced noise, and a reduced size of aircraft due to not needing a tail rotor. These advantages come at the cost of increased mechanical complexity for the rotor assembly.
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