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Posted 2/4/2011 Printable Fact Sheet
Pratt & Whitney R-985
DAYTON, Ohio -- Pratt & Whitney R-985 on display in the World War II Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo)
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The R-985 air-cooled engine was first used by the Air Corps in 1932. At that time, it was rated at 300 hp. By 1934 it had been sufficiently improved so that it delivered 350 hp, and two years later it was rated at 400 hp. Further refinements were made, and during World War II it produced 450 hp. Through the years, the R-985 was used in thousands of military aircraft of various types in addition to being installed in numerous civilian types of aircraft.

Type: 9-cylinder, air-cooled, supercharged radial
Displacement: 985
Maximum rpm: 2,300
Maximum hp: 450
Cost: $6,000

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