1933

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Collier Trophy for 1933 awarded to Hamilton Standard Propeller Co., with particular credit to Frank W. Caldwell, chief engineer, for development of a controllable-pitch propeller now in general use.

NACA assisted Army, Navy, and industry in the development of reliable retractable landing gears, controllable pitch propellers, more efficient wing sections and wing flaps.

Harry W. Bull of Syracuse, N.Y., developed small liquid-propellant rocket engine

Fred B. Weick and his associates at NACA's Langley Laboratory designed and constructed the Welck W-1 airplane which incorporated such novel features as tricycle landing gear, pusher propeller, and interconnected ailerons and rudder for simpler and safer flying.

Eugen Sanger of Germany published his classic Raketenflugtechnik, which dealt with rocket motor design and high-speed flight in the atmosphere.

British Interplanetary Society organized.