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NK-31
Part of NK-9 Family
Kuznetsov LOx/Kerosene rocket engine. Upgraded version of engines for N-1 stage 4, with multiple ignition capability and increased operational lifetime. Mothballed in 1974. Proposed for Black Colt launch vehicle in 1993.

AKA: 11D114. Status: Study 1993. Date: 1969-74. Thrust: 402.00 kN (90,373 lbf). Unfuelled mass: 722 kg (1,591 lb). Specific impulse: 353 s. Burn time: 1,200 s. Diameter: 1.40 m (4.50 ft).

To have been used in the N-1F fourth (Block G translunar injection) stage. After initial failures of the N-1 Kuznetsov developed modified versions of engines for all four stages, which had multiple ignition capability and increased operational lifetime.

Engine: 722 kg (1,591 lb). Chamber Pressure: 92.00 bar. Area Ratio: 124. Thrust to Weight Ratio: 56.78. Oxidizer to Fuel Ratio: 2.6.



Country: Russia. Spacecraft: Black Colt. Propellants: Lox/Kerosene. Stages: Black Colt AV. Agency: Kuznetsov bureau. Bibliography: 351.

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