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.
References in periodicals archive ?
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.