Leonard S. Hobbs
Leonard S. Hobbs (1896 in Carbon County, Wyoming
Carbon County, Wyoming
Carbon County is a county located in the U.S. state of Wyoming. As of 2010, the population was 15,885. Its county seat is Rawlins.- History :Carbon County was organized in 1868....

 – 1977) was an aeronautical engineer
An engineer is a professional practitioner of engineering, concerned with applying scientific knowledge, mathematics and ingenuity to develop solutions for technical problems. Engineers design materials, structures, machines and systems while considering the limitations imposed by practicality,...

 who started in 1920 with the Army Air Service at McCook Field
McCook Field
McCook Field was an airfield and aviation experimentation station operated by the Aviation Section, U.S. Signal Corps and its successor the United States Army Air Service from 1917-1927...

 in Dayton, Ohio
Dayton, Ohio
Dayton is the 6th largest city in the U.S. state of Ohio and the county seat of Montgomery County, the fifth most populous county in the state. The population was 141,527 at the 2010 census. The Dayton Metropolitan Statistical Area had a population of 841,502 in the 2010 census...

 and later worked for Stromberg Motor Devices Corporation. He developed the first float-type carburetor
A carburetor , carburettor, or carburetter is a device that blends air and fuel for an internal combustion engine. It is sometimes shortened to carb in North America and the United Kingdom....

 for aircraft engines that was capable of providing normal operation during inverted flight. In 1927 he became a research engineer at the Pratt & Whitney Aircraft Company
Pratt & Whitney
Pratt & Whitney is a U.S.-based aerospace manufacturer with global service operations. It is a subsidiary of United Technologies Corporation . Pratt & Whitney's aircraft engines are widely used in both civil aviation and military aviation. Its headquarters are in East Hartford, Connecticut, USA...

 and by 1944 was vice president of engineering for parent company United Aircraft Corporation
United Aircraft
The United Aircraft Corporation was formed in 1934 at the break-up of United Aircraft and Transport Corporation. In 1975, the company became the United Technologies Corporation.-1930s:...

. He won the prestigious 1952 Collier Trophy
Collier Trophy
The Collier Trophy is an annual aviation award administered by the U.S. National Aeronautics Association , presented to those who have made "the greatest achievement in aeronautics or astronautics in America, with respect to improving the performance, efficiency, and safety of air or space...

 for "designing and producing the P&W J57
Pratt & Whitney JT3C
|-Specifications :-See also:-References:NotesBibliography* Francillon, René J. McDonnell Douglas Aircraft since 1920. London: Putnam, 1979. ISBN 0-370-00050-1.-External links:* * *...

 turbojet engine". In 1956 was elected vice chairman of United Aircraft, retiring in 1958 but remaining on the company's board of directors until 1968.

He was the author of The Wright Brothers' Engines and Their Design, published in 1971 by the Smithsonian Institution Press as part of its Smithsonian Annals of Flight series.

The 1972 Sperry Award was won by "Hobbs and Perry W. Pratt and the dedicated engineers of the Pratt & Whitney Aircraft Division of United Aircraft Corporation for the design and development of the JT3 turbo jet engine".
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