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Frank W. Caldwell

Frank W. Caldwell being congratulated on winning the 1933 Collier Trophy (visible in the background) for his work with Hamilton Standard on the controllable-pitch propeller.<ref name="airandspace">{{cite journal|url=https://airandspace.si.edu/collection-objects/caldwell-frank-w-roosevelt-franklin-delano-president-awards-and-trophies-collier | title=National Air & Space Museum, Franklin D Roosevelt (Franklin Delano) (1933)}}</ref> Frank Walker Caldwell (1889–1974) was a leading American propeller engineer and designer. As the United States government's chief propeller engineer (1917–1928), he pioneered propeller engineering and propeller testing facilities and techniques. Working at Hamilton Standard Propeller Corporation, they won the 1933 Collier Trophy for his work on the controllable-pitch propeller. After 25 years of service, he retired in 1955 as director of the United Aircraft Corporation Research Division. Provided by Wikipedia