The LE-9, designed for the H3 launch vehicle, is a new cryogenic booster engine with high performance and high reliability, while reducing manufacturing cost It will be the world's first booster engine with an expander cycle. In the designing process, the highly reliable design approach is adopted to LE-9 and turbopumps design in order to achieve the target of performance, reliability and cost. This paper reports the characteristics of the LE-9 engine and turbopumps, and their latest development status.
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