The Pratt & Whitney J75 was first announced in 1954. It was developed from Pratt & Whitney's J57 engine with similar component arrangement, but having entirely new design features emphasizing weight control, and resulting in significantly lower specific weight. Production began in the spring of 1957, and both afterburning and nonafterburning versions were produced. The commercial version of the J75, known as the JT4, was certificated in March 1957.
The J75 powered the first U.S. operational Mach 2 fighter-interceptor, the Convair F-106 Delta Dart, and the Republic F-105 Thunderchief fighter-bomber, Lockheed U-2A reconnaissance aircraft, and North American F-107A. The JT4 was used on the Boeing 707-220/-320 and the McDonnell Douglas DC-8-20/-30 airliners. This J75-P-2, powered the Martin P6M-2 Seamaster flying boat.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
1957
United States of America
PROPULSION-Turbines (Jet)
Pratt & Whitney
Type: Turbojet
Thrust: 75,600 N (17,000 lb)
Compressor: 16-stage, 2 spool axial
Combustor: Cannular
Turbine: Single-stage high pressure and 2-stage low pressure axial
Weight: 2,277 kg (5,020 lb)
Length 481 cm (189.2 in.), Diameter 109 cm (43.0 in.)
A19700093000
Transferred from the U.S. Navy, Naval Supply Center, Cheatham Annex, Williamsburg, Virginia
National Air and Space Museum
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