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YF-20B
Part of YF-20 Family
Beijing Wan Yuan N2O4/UDMH rocket engine. In production. Boosted CZ-2C, CZ-2D, CZ-2E, CZ-2E(A), CZ-3A, CZ-3B, CZ-3C, CZ-4A. First flight 1988.

Status: In production. Number: 236 . Thrust: 816.30 kN (183,512 lbf). Specific impulse: 289 s. Specific impulse sea level: 259 s. Burn time: 170 s. Diameter: 0.84 m (2.75 ft).

Thrust (sl): 731.500 kN (164,448 lbf). Thrust (sl): 74,597 kgf. Chamber Pressure: 71.00 bar. Area Ratio: 10. Thrust to Weight Ratio: 0.



Family: Storable liquid. Country: China. Launch Vehicles: Chang Zheng 2C, Chang Zheng 4, Chang Zheng 2E, Chang Zheng 2D, Chang Zheng 3A, Chang Zheng 3B, Chang Zheng 2E(A), Chang Zheng 3C. Propellants: N2O4/UDMH. Stages: CZ-3A-1, CZ-2E(A)-0, CZ-2E-1, CZ-4A-1, LB-40. Agency: Beijing Wan Yuan.

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