coaxial propellers

coaxial propellers

Two propellers mounted on concentric propeller shafts with independent drives and rotating in opposite direction. This arrangement results in zero residual torque.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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From 1909 to 1913, he built three original, arrow-shaped airplanes, with flight control planes in front, two coaxial propellers, NACA-like ring around the engine, and independent suspension tricycle landing gear with brakes.
An air pioneer

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