Pratt & Whitney JT3D
The Pratt & Whitney JT3D is an early turbofan engine derived from the Pratt & Whitney JT3C turbojet. It was first run in 1958 and was first flown in 1959 under a B-45 Tornado test aircraft. Over 8,000 JT3Ds were produced between 1959 and 1985. Most JT3D engines still in service today are used on military aircraft, where the engine is referred to by its USAF designation of TF33.
Read more about Pratt & Whitney JT3D: Design and Development, Variants, Aircraft Applications
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—Edwin John Pratt (1882–1964)