Pratt & Whitney T34

The Pratt & Whitney T34, which the company called the PT2 Turbo-Wasp, is an American axial-flow turboprop engine designed and built by Pratt & Whitney. The United States Navy funded the development of a turboprop in 1945, and the T34 was produced from 1951 to 1960 although it was never used in Navy aircraft production. A Boeing B-17 Flying Fortress testbed flew with a T34 mounted in its nose in September 1950, and the engine was later tried in the Boeing YC-97J Stratofreighter, the Douglas YC-124B Globemaster II and two Navy Lockheed R7V-2 Constellation variants, which began flight tests on 1 September 1954. Its only major application was the Douglas C-133 Cargomaster, the largest aircraft to use it. Variants ranged from about 5,200 to 7,500 equivalent shaft horsepower, the higher ratings using water injection, and two civilian versions planned for Lockheed airliners were never built. Surviving engines are held by the National Air and Space Museum, the Travis Air Force Base Heritage Center and the Pacific Coast Air Museum.