The BF-20 (Chinese: 蓝焱-20; pinyin: Lányàn-20, lit. Blue Flame 20) is a full-flow staged combustion cycle rocket engine burning liquid methane and liquid oxygen under development by LandSpace.
History In 2021, LandSpace initiated the development of BF-20 for its Zhuque-3 rocket. As of 2024, the technical design of the engine has been completed, and a hot fire test is scheduled for 2025, with the goal of achieving flight readiness by 2027. The engine conducted its first full-system test in May 2025. By September 2025, it had completed thirty test firings, with thrust limited to 110 tons. In March 2026, LandSpace announced that the engine had completed a full-system long-duration test and over one hundred full-system ignition tests in total. The company noted that the SpaceX Raptor was the only other full-flow staged-combustion engine to have flown.
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