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Pratt & Whitney TF30
The Pratt & Whitney TF30 (company designation JTF10A〔) was a military low-bypass turbofan engine originally designed by Pratt & Whitney for the subsonic F6D Missileer fleet defense fighter, but this project was cancelled. It was later adapted with an afterburner for supersonic designs, and in this form it was the world's first production afterburning turbofan, going on to power the F-111 and the F-14A Tomcat, as well seeing use in early versions of the A-7 Corsair II without an afterburner. First flight of the TF30 was in 1964 and production continued until 1986.
==Design and development==
In 1958, the Douglas Aircraft Company proposed a short-range, four-engined jet airliner to fill the gap below its new DC-8 intercontinental, known internally as the Model 2067. Intended to be marketed the DC-9, it was not directly related to the later twin-engined Douglas DC-9.〔Connors 2010, p. 341〕 Pratt & Whitney (P&W) had offered its JT8A turbojet for the airliner, but Douglas preferred to go with a turbofan engine, which would have a greater fuel efficiency than a turbojet. P&W then proposed the JT10A, a half-scale version of its newly developed JT8D turbofan. Development of the new design began in April 1959,〔 using the core of the JT8.〔http://www.flightglobal.com/pdfarchive/view/1968/1968%20-%200018.html TURBOFANS: A Survey of Current Airline Powerplants〕 Douglas shelved the model 2067 design in 1960, as the targeted US airlines preferred the newly offered Boeing 727.〔Donald 1999, p.609〕
In 1960, the United States Navy selected the JT10A, designated TF30-P-1, to power the proposed Douglas F6D Missileer, but the project was canceled in April 1961.〔(AERO ENGINES 1962 )〕 Meanwhile, the TF30 had been chosen by General Dynamics for its entrant in the TFX competition for the United States Air Force and USN, which was selected for production as the F-111.〔Connors 2010, p.346〕 The version of the TF30 for the F-111 included an afterburner.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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