The X-176 Pratt & Whitney turbojet engine was the prototype of the famous J57 series, the first successful twin-spool turbine engine and the first production aircraft engine in the 10,000 lb (44,480 N) thrust class. The early 1948 design was superceded by the "wasp-waisted" configuration and retired in August 1950.

Leonard S. Hobbs, Vice President for Engineering of United Aircraft Corporation, was awarded the 1953 Collier Trophy for his leading part in conceiving and developing the J57.

Among the military aircraft powered by the J57 were the Boeing B-52, North American F-100 Super Sabre, McDonnell F-101 Voodoo, Convair F-102 Delta Dagger, Douglas F4D Skyray, Douglas A3D Skywarrior, Ling-Temco-Vought F8U Crusader, Lockheed U-2 , and Northrop SM-62 Snark. The JT3 commercial version of the engine powered the Boeing 707-120, Boeing 720, and Douglas DC-8-10.

This engine powered the F8U-1 Crusader, the first supersonic U.S. Navy carrier-based aircraft.

 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 Circa 1955 Country of Origin United States of America Type PROPULSION-Turbines (Jet) Manufacturer Pratt & Whitney
 Physical Description Type: Turbojet Thrust: 66,720 N (15,000 lb) at 8,200 rpm Compressor: 9-stage high pressure and 6-stage low pressure axial Combustor: Cannular Turbine: Single-stage high pressure and 2-stage low pressure axial Weight: 2,205 kg (4,860 lb) Dimensions Length 680 cm (267.6 in.), Diameter 101 cm (39.8 in.)
 Inventory Number A19710059000 Credit Line Transferred from the General Services Administration, Disposal Division, U.S. Naval Supply Center, San Diego, California Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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