Kuznetsov Lox/Kerosene rocket engine. 1755 kN. N-1F, Kistler stage 2. Design 1975. Isp=346s. Modified version of original engine with multiple ignition capability. Never flown and mothballed after the cancellation of the N1. Resurrected for Kistler.

Version of NK-33 with higher expansion ratio nozzle for operation at altitude. After initial failures of the N-1 the company developed modified versions of engines for all four stages, which had multiple ignition capability and increased operational lifetime. Never flown, they were mothballed and selected by Kistler 20 years later for the second stage of their commercial launch vehicle.

Application: N-1F stage 2 (block B).


Thrust (sl): 1,247.800 kN (280,517 lbf). Thrust (sl): 127,237 kgf. Engine: 1,396 kg (3,077 lb). Chamber Pressure: 145.70 bar. Area Ratio: 70. Thrust to Weight Ratio: 128.22. Oxidizer to Fuel Ratio: 2.8.

AKA: 11D112.
Status: Design 1975.
Diameter: 2.50 m (8.20 ft).
Thrust: 1,755.00 kN (394,539 lbf).
Specific impulse: 346 s.
Specific impulse sea level: 246 s.
Burn time: 600 s.
Vague: 1969-74.

Associated Stages
  • Kistler Stage 2 Lox/Kerosene propellant rocket stage. Loaded/empty mass 131,000/13,100 kg. Thrust 1,769.10 kN. Vacuum specific impulse 348 seconds. Empty mass includes payload bay, heat shield, parachutes, and landing bag for recovery at base. Empty mass calculated based by apportioning total vehicle empty mass. More...
  • N1F Block B Lox/Kerosene propellant rocket stage. Loaded/empty mass 620,000/55,700 kg. Thrust 14,040.00 kN. Vacuum specific impulse 346 seconds. Includes 3,500 kg for Stage 2-3 interstage. More...
  • UR-500MK-2 Lox/Kerosene propellant rocket stage. Loaded/empty mass 161,000/11,000 kg. Thrust 1,860.00 kN. Vacuum specific impulse 346 seconds. Empty mass estimated based on overall vehicle mass fraction. Length estimated based on total mass. More...

  • Data sheets NPO Trud via Dietrich Haeseler.

Associated Propellants
Associated Manufacturers and Agencies
  • Kuznetsov Russian manufacturer of rocket engines. Kuznetsov Design Bureau, Russia. More...

Associated Launch Vehicles
  • N1F Russian heavy-lift orbital launch vehicle. The N1F would have been the definitive flight version of the N1, incorporating all changes resulting from the four flight tests of the vehicle, including the new Kuznetsov engines and 10% greater liftoff mass by using superchilled propellants in all stages. N1 8L would have been the first N1F configuration flight, with launch planned in the third quarter of 1975 at the time the project was cancelled. More...
  • N1F Sr Russian heavy-lift orbital launch vehicle. The final more modest version of the N1F replaced the fourth and fifth stages of the N1 with the single liquid oxygen/liquid hydrogen Block Sr stage. Development of the Sr stage was from May 1971 until cancellation of the N1 project in May 1974. More...
  • N1F-L3M Russian heavy-lift orbital launch vehicle. The N1M was found to be too ambitious. The N1F of 1968 was instead pencilled in to be the first Soviet launch vehicle to use liquid oxygen/liquid hydrogen high energy cyrogenic propellants. The N1F would have only used the Block S and Block R fourth and fifth stages in place of the N1's Block G and Block D. More...
  • Kistler K-1 American low-cost orbital launch vehicle. The Kistler K-1 was a reusable two-stage launch vehicle developed by a prestigious team of ex-Apollo managers, designed originally for launch of Iridium-class communications satellites to medium altitude earth orbit. Kistler began development but had to file for Chapter 11 protection before detailed hardware fabrication was completed. It emerged from bankruptcy in 2005, and merged with suborbital startup Rocketplane to form Rocketplane Kistler. On 8 November 2006, it was announced that Alliant Techsystems, as lead contractor, would complete the K-1 launch vehicle, with Rocketplane Kistler as a subcontractor, under NASA's Commercial Orbital Transportation Services (COTS) program. More...

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