Longyun Engine
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The "Longyun" liquid oxygen-methane engine is the first multi-start, reusable, high-thrust liquid rocket engine launched by Jiuzhou Yunjian. It can serve as the primary first-stage propulsion engine for medium-to-large-sized liquid launch vehicles. The "Longyun" engine boasts a sea-level thrust-to-weight ratio exceeding 80, delivering a sea-level thrust of 70 tons and a vacuum thrust of 80 tons, with a thrust regulation range spanning from 32% to 106%. This engine can be applied in configurations of up to five engines in parallel for rockets with a diameter of 3.35 meters, seven engines in parallel for 3.8-meter-diameter rockets, and nine engines in parallel for 4.2-meter-diameter rockets. Each single module supports liftoff masses ranging from 350 to 630 tons, while the maximum liftoff capacity for heavy-duty parallel configurations can reach up to 1,800 tons. Currently, the "Longyun" engine has successfully completed a 7,000-second hot-fire test evaluation. Notably, it marks the first domestic achievement of ignition testing using stainless steel tanks paired with a liquid oxygen-methane engine. In 2024, the engine will undergo suborbital flight tests and sea-based recovery operations.
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Jiuzhou Yunjian (Beijing) Space Technology Co., Ltd. is a national high-tech enterprise integrating liquid rocket engine design and development, assembly and testing, as well as comprehensive end-to-end flight support services.
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