contrarotating propeller

noun
con·​tra·​rotating propeller | \ ¦kän‧trə+...-\

Definition of contrarotating propeller

: one of a pair of propellers (as on a ship or airplane) mounted on concentric shafts, having a common drive, and turning in opposite directions to reduce the torque reaction

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History and Etymology for contrarotating propeller

contra- + rotating

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