Pratt & Whitney R-1535-96 Twin Wasp Junior


Pratt & Whitney R-1535-96 Twin Wasp Junior aircraft engine at the New England Air Museum

Specifications

Type:   14-cylinder, 2-row, supercharged, air-cooled, radial, piston
Turbine:   
Compressor:   
Displacement:   1,535 cu. in.
Weight:   1,087 lbs.
Power Output:   725 to 825 hp depending on model
Year:   
NEAM Id:   22
Location:   Civil Hangar

Gift of the Pacific Airmotive Corporation

Perhaps the least known of the famous Wasp series of Pratt & Whitney aircraft engines is the Twin Wasp Junior which was developed for the U.S. Navy and used almost exclusively by the military. There were two major series that power outputs from 750 to 825 horsepower and was used primarily in both U.S. Army and Navy fighters, attack bombers, and observation aircraft from the 1930s to 1940s. One notable civilian exception is that it used in the Howard Hughes H-1 air racer which set a world airspeed and a transcontinental speed record across the United States. Production continued until 1941 with 2,880 manufactured.

This engine powered a U.S. Navy Vought SB24-1 Vindicator dive bomber.

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