12 January 2021
China Aerospace Science and Technology Corporation (CSAC) has made significant advances in several key technologies for the new engine, which will have a much higher fuel efficiency than those currently in service. The unnamed hydrogen/oxygen engine is expected to eventually replace the YF-77 which currently powers the first stage of China’s Long March CZ-5 family of heavy-lift vehicle rockets. Instead of the YF-77’s gas-generator cycle, the new rocket will use a staged combustion cycle, which increases efficiency by burning through the propellant more thoroughly, but also poses engineering design and build challenges.
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