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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)

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)


The R-985 air-cooled engine was first used by the Air Corps in 1932. At that time, it was rated at 300 horsepower. Over the next ten years, further refinements were made, and during World War II some variants produced up to 450 horsepower. The R-985 powered thousands of military aircraft of various types in addition to being installed in numerous civilian types of aircraft.

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

Click here to return to the World War II Gallery.