The Pratt & Whitney J75 (civilian designation: JT4A) is an axial-flow turbojet engine first flown in 1955. A two-spool design in the 17,000 lbf (76 kN) thrust class, the J75 was essentially the bigger brother of the Pratt & Whitney J57 (JT3C). It was known in civilian service as the JT4A, and in a variety of stationary roles as the GG4 and FT4

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2024年10月3日 · j75是美国普拉特·惠特尼公司研制的大型军用双转子加力(或同时喷水加力)涡喷发动机，jt4是公司编号。 它是为满足美国空、海军超音速截击机的要求发展的。

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最强大的系列发动机 J75-P-19W 已经提供了 118 kN 的推力，带有加力燃烧室和喷水。 这个版本的总长度为 6.1 m，带有加力燃烧器和推力管。发动机用压缩空气启动，但也有一个可以由飞行员操作的烟火启动装置。 这意味着可以在 10 秒内达到所需的启动速度。

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