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Engine Model: 11D53F. Government Designation: 11D53F. Designer: Kuznetsov. Developed in: 1965. Application: N1F 1965 - V. Propellants: Lox/Kerosene. Thrust(vac): 612.000 kN (137,583 lbf). Isp: 346 sec. Chambers: 1. Country: Russia. Status: Study 1965.

As per N1 improvement study, 1965. Engine thrust increased and stretched propellant tanks resulting in 20% longer burn time.

Engine Model: 11D53M. Government Designation: 11D53M. Designer: Kuznetsov. Developed in: 1965. Application: N1M 1965 - V. Propellants: Lox/Kerosene. Thrust(vac): 735.000 kN (165,234 lbf). Isp: 347 sec. Chambers: 1. Country: Russia. Status: Study 1965.

As per N1 improvement study, 1965. Further increase in thrust of Block V engines.

Engine Model: NK-21. Manufacturer Name: NK-21. Government Designation: 11D53. Other Designations: NK-9V. Designer: Kuznetsov. Developed in: 1962-72. Application: N-1 stage 3 (block V). Propellants: Lox/Kerosene. Isp: 318 sec. Chambers: 1. Country: Russia. Status: Out of production. First Flight: 1969. Last Flight: 1972. Flown: 16.

Based on NK-9 engine. Propellants kerosene T-1 / LOX. 4 engines used in N-1 stage 3 (block V).

NK-21 used on Rocket Stages
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