contrarotating propellers

contrarotating propellers

[¦kän·trə′rō‚tād·iŋ prə′pel·ərz]
(mechanical engineering)
A pair of propellers on concentric shafts, turning in opposite directions.

contrarotating propellers

A set of two propellers mounted on the same shaft but rotating in opposite directions to reduce the torque to zero.
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"One model even had two contrarotating propellers up front." However, even in such specialist events, quiet electric power has almost completely taken over from the internal combustion engine and although this competition saw biplanes and twin-motor models competing with the more conventional monoplanes, they were all battery-powered without exception.