|Type:||28-cylinder, 4-row, supercharged, air-cooled, radial, piston|
|Displacement:||4,362.5 cu. in.|
|Power Output:||3,000 hp @ 2,700 rpm|
Courtesy of Pratt & Whitney Group United Technologies Corporation
Pratt & Whitney's last radial piston engine was the 28-cylinder Wasp Major. The largest piston engine the company produced displacing 4,360 cubic inches. Growth models developed ratings up to 4,300 horsepower.
The engine was configured with four rows of cylinders arranged in a spiral to enhance cooling. While the design was initated early in World War II, production did not occur until near the end of war. Production ended in 1955 with 18,679 produced. Its primary application was heavy transports and bombers.
Prominent aircraft that used the Wasp Major include:
An Air Force B-50, also powered by four Wasp Major engines, was the first airplane to fly nonstop around the globe, a feat made possible by aerial refueling.
The advent and rapid devlopment of jet engines soon made piston engines, such as the Wasp Major, that powered military and many commercial aircraft obsolete.
Source: Pratt & Whitney
Please contact Nick Hurley, Museum Curator, by email if you have any information or comments on the Pratt & Whitney R-4360 Wasp Major.