This page no longer updated from 31 October 2001. Latest version can be found at RD-56

Manufacturer Name: RD-56. Government Designation: 11D56. Other Designations: KVD-1, D-56. Designer: Isayev. Developed in: 1960-77. Application: N1 block R. Used on stages: N1 Block R. Used on launch vehicles: N1F-L3M, N1M. Propellants: Lox/LH2 Thrust(vac): 7,100 kgf. Thrust(vac): 69.60 kN. Isp: 462 sec. Burn time: 800 sec. Mass Engine: 282 kg. Diameter: 1.6 m. Length: 2.1 m. Chambers: 1. Chamber Pressure: 55.90 bar. Area Ratio: 198.70. Oxidizer to Fuel Ratio: 6.00. Country: Russia. Status: Developed 1960-77. References: 225 , 227 , 93 , 314 , 344 . Comments: Oxygen-hydrogen engine for cryogenic upper stage. Developed but never flown. Design sold to India in 1990's for GSLV.
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Last update 12 March 2001.
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