单词	contra-rotating
释义	contra-rotating /kɒntrərəʊˈteɪtɪŋ / adjective Rotating in the opposite direction or in opposite directions, especially about the same shaft.The valves are actuated via drag arms from twin, contra-rotating camshafts.... However, most designs still had two or more contra-rotating blades to solve the torque problem and this caused highly complex and unsound craft. Another benefit was that the contra-rotating propellers eliminated torque.
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