The YF-40 is a Chinese liquid rocket engine burning N2O4 and UDMH in a gas generator cycle. It has dual gimbaling combustion chambers. Originally it was developed for the Long March 1D second stage. It is used on the third stage of the Long March 4 family of launch vehicles.
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This article is an automated import of the Wikipedia article "YF-40", available at https://en.wikipedia.org/wiki/YF-40 . Text is licensed under CC BY-SA 4.0.