This page no longer updated from 31 October 2001. Latest version can be found at YF-25/23

Designer: Beijing Wan Yuan Industry Corp. Used on stages: CZ-2E-2, CZ-3A-2, CZ-4A-2. Used on launch vehicles: CZ-2D, CZ-2E, CZ-2E(A), CZ-3A, CZ-3B, CZ-3C, CZ-4A. Propellants: N2O4/UDMH Thrust(vac): 84,739 kgf. Thrust(vac): 831.00 kN. Isp: 295 sec. Isp (sea level): 260 sec. Burn time: 295 sec. Diameter: 3.4 m. Chambers: 1. Chamber Pressure: 71.00 bar. Area Ratio: 10.00. Country: China. Status: In Production. First Flight: 1988. Last Flight: 1999. Flown: 21. Comments: Cluster of YF-25 and 4 x YF-23 verniers.
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Last update 12 March 2001.
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© Mark Wade, 2001 .