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parents of astronaut Walter Schirra, Jr. In 1927 Diehl became an engine flight test pilot for the Wright Aeronautical Corporation of Paterson, New Jersey flying their stable of test planes at Teterboro Airport.  He was with them about three years during which time he contributed much to the first air testing of the celebrated Wright J-5, Cyclone and Whirlwind series engines, all of which went on to establish such a long and enviable reputation in the aviation industry.  

Diehl continued flying until 1945 and still holds a valid second class pilot license.  During his flying career Diehl taught several airline pilots who are flying in service today.  Since retiring from flying he has devoted considerable time to the study of mufflers to reduce the noise of planes over cities, and has developed and patented several valuable articles for the plumbing industry.

Early Bird, Flying Pioneer William C. Diehl has devoted the major part of his active life to aviation and is richly deserving of a worthy and sizable niche in the history of its early American development and is certainly a noteworthy member of that exclusive group of so-called young daredevils who together chiseled out the aviation industry our world enjoys today.

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