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Pratt & Whitney R-4360
Wasp Major

The Engine Specifications

The R-4360 Wasp Major was developed during WWII though it only saw service late in the war.  It represents the most technically advanced and complex reciprocating aircraft engine produced in large numbers in the U.S.  The passing of the KC-97 in the late 1970s marked the end of the large piston engine and the turbocharger in the U.S. Air Force.

The Wasp Major first flew in 1942 and was in production from 1944 - 1955.  Over 18,000 were produced.


28 cylinder, air-cooled, four-row radial
displacement: 4,360 cu. in.
RPM: 4,000 - 4,300
Models Used by
R-4360-4A: 3,000 hp (2236 kW)
R-4360-4W: 3,000 hp (2236 kW)
R-4360-35: 3,500 hp (2610 kW)
R-4360-41: 3,500 hp (2610 kW)
R-4360-59B: 3,500 hp (2610 kW)
R-4360-63A: 3,800 hp (2834 kW)
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page updated 27 March 2005



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Kenneth W Shanaberger 2000 - 2010