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The YF-1 was a Chinese liquid rocket engine burning N2O4 and UDMH in an gas generator cycle. It is a basic engine which when mounted in a four engine module forms the YF-2. It was used as the basis for developing a high altitude version known as the YF-3.〔〔 Some authors state that it was a direct copy of С.2.1100/С.2.1150 La-350 booster engine developed by Isayev OKB-2 (NII-88).〔 What is known is that the engine development had great trouble with combustion instabilities and it took a long time to have a reliable combustion. ==Versions== The basic engine has been used since the DF-3 rocket and has been the main propulsion of the Long March 1 orbital launch vehicles.〔 * YF-1: Core engine. Flown originally on the DF-3. Used UDMH/AK27S as propellant. Allegedly a copy of OKB-2's С.2.1150.〔〔 * YF-1A: Core engine. Improved version that would power the DF-3A, DF-4 and Long March 1.〔〔〔〔 * YF-1B: Core engine. Improved version used on the Long March 1D. Switched propellants to UDMH/N2O4〔 * YF-3: Upper stage version. Used on the DF-4.〔 * YF-3A: Improved upper stage version. Used on the Long March 1.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「YF-1」の詳細全文を読む スポンサード リンク
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