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YF-75
The YF-75 is a liquid cryogenic rocket engine burning liquid hydrogen and liquid oxygen in a gas generator cycle. It is China's second generation of cryogenic propellant engine, after the YF-73, which it replaced. It is used in a dual engine mount in the H-18 third stage of the Long March 3A, Long March 3B and Long March 3C launch vehicles. Within the mount, each engine can gimbal individually to enable thrust vectoring control. The engine also heats hydrogen and helium to pressurize the stage tanks and can control the mixture ratio to optimize propellant consumption.〔
==Development==
Given the upward trend on geosynchronous communication satellite’s mass and size, a program to develop an engine more powerful than the YF-23 was started by 1982.〔 The proper development of the engine started in 1986 and leveraged the experience of the YF-73.〔 It flew for the first time in 1994. By September 2013, it had accumulated 12 start up and 3,000 seconds of firing time without malfunction.〔
By 2006 and with the project for the Long March 5 family a serious redesign program was started. The resulting engine, the YF-75D is a different engine, using a closed circuit expander cycle like the RL10.
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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