Hamilton Standard Controllable Pitch Propeller

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This propeller, one of the first produced by Hamilton Standard, represented a major advance in aircraft technology. It allowed a pilot to adjust the blade’s pitch to provide the best performance at different air speeds—similar to changing gears in a car or on a bicycle. On takeoff the pilot chose a lower pitch to make the blade spin faster  and provide maximum power. In flight the pilot switched to a higher pitch to make the blade spin slower and conserve fuel.The propeller is preserved in “used” condition.


Eric Long

ID #:

NASM 2011-00595


National Air and Space Museum Archives, Smithsonian Institution


Smithsonian Institution

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