Encyclopedia Astronautica

N2O4/UDMH propellant rocket stage. Loaded/empty mass 4,266/2,356 kg. Thrust 18.60 kN. Vacuum specific impulse 317 seconds. Main engine could be throttled to 800 kgf.

Status: Active.
Gross mass: 4,266 kg (9,404 lb).
Unfuelled mass: 2,356 kg (5,194 lb).
Height: 1.00 m (3.20 ft).
Diameter: 3.00 m (9.80 ft).
Span: 3.00 m (9.80 ft).
Thrust: 18.60 kN (4,181 lbf).
Specific impulse: 317 s.
Burn time: 1,000 s.
Number: 125 .

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Associated Countries
Associated Engines
  • RD-869 Yuzhnoye N2O4/UDMH rocket engine. 8.580 kN. R-36M2 vehicle bus. Based on RD-864. Two thrust levels. The four thrusters swing out of the stage housing before use. Chamber pressure 41 / 17 bar. Diameter 3,0 / 4,02 m. Isp=313s. First flight 1986. More...

Associated Launch Vehicles
  • R-36MU 15A18 Ukrainian intercontinental ballistic missile. Improved version of the R-36M with a new ten warhead MIRV bus, better guidance system, increased throw-weight, and increased range. More...
  • R-36M2 15A18M Ukrainian intercontinental ballistic missile. The R-36M2 was the Soviet Union's answer to the American 'Star Wars' anti-ballistic missile system. It was unusually named 'Voevoda' (an old Russian word for the leader of an army) in recognition of its planned role. In the end, it was only deployed in very limited numbers before the end of the Cold War. More...
  • Dnepr Ukrainian orbital launch vehicle based on decommissioned R-36M2 intercontinental ballistic missiles. More...

Associated Propellants
  • N2O4/UDMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Unsymmetrical Dimethylhydrazine ((CH3)2NNH2) became the storable liquid fuel of choice by the mid-1950's. Development of UDMH in the Soviet Union began in 1949. It is used in virtually all storable liquid rocket engines except for some orbital manoeuvring engines in the United States, where MMH has been preferred due to a slightly higher density and performance. More...

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