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astronautix.com RD-251


Manufacturer Name: RD-251. Government Designation: 8D723. Designer: Glushko. Developed in: 1961-65. Application: R-36-0 stage 1, Tsyklon 2 stage 1. Used on stages: R-36-0-1, Tsyklon 2-1. Used on launch vehicles: R-36-0, Tsyklon 2. Propellants: N2O4/UDMH Thrust(vac): 270,000 kgf. Thrust(vac): 2,643.00 kN. Isp: 301 sec. Isp (sea level): 269 sec. Burn time: 120 sec. Mass Engine: 1,729 kg. Diameter: 2.5 m. Length: 1.8 m. Chambers: 6. Chamber Pressure: 83.30 bar. Area Ratio: 14.70. Oxidizer to Fuel Ratio: 2.60. Country: Russia. Status: In Production. First Flight: 1965. Last Flight: 1997. Flown: 133. References: 42 , 317 , 342 . Comments: Assembly of 3 RD-250-type units.
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Last update 12 March 2001.
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