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This X-176 Pratt & Whitney turbojet was the prototype of the famous J57 series and was the first successful twin-spool turbine engine. Design of the barrel-shaped prototype started in 1948, and was released for testing in mid-1949. Superseded by the "wasp-waisted" configuration, the X-176 was retired in 1950 after accumulating 143 hours on a test stand.

Continuing development culminated with the J57 being the first production aircraft engine to be officially rated in the 10,000 lb (44,480 N) thrust class. Beginning with shipments in early-1953, the J57 powered the Boeing B-52, North American F-100, McDonnell F-101, Convair F-102, Douglas F4D, Douglas A3D, Ling-Temco-Vought F8U, Lockheed U-2, and Northrop SM-62 Snark missile. The JT3 commercial version powered the Boeing 707-120, Boeing 720, and Douglas DC-8-10.

United Aircraft Corporation's Leonard Hobbs was awarded the 1953 Collier Trophy for his leading part in developing the J57.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date 1949 Country of Origin United States of America Type PROPULSION-Turbines (Jet) Manufacturer Pratt & Whitney
 Physical Description Type: Turbojet, twin-spool Thrust: 44,480 N (10,000 lb) (dry) Compressor: 9-stage low-pressure axial; 7-stage high-pressure axial Combustor: 8 annular chambers Turbine: Three-stage axial Weight: 1,900 kg (4,200 lb) Dimensions Length 680 cm (267.6 in.), Diameter 101 cm (39.8 in.)
 Materials HAZMAT: Magnesium
Aluminum, Inconel, Steel, Rubber, Paint, Preservative coating
 Inventory Number A19560045000 Credit Line Gift of United Aircraft Corporation, Pratt & Whitney Aircraft Division Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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