Encyclopedia Astronautica
R-21-1


N2O4/UDMH propellant rocket stage. Loaded mass 16,600 kg.

Status: Retired 1989.
Gross mass: 16,600 kg (36,500 lb).
Height: 12.00 m (39.00 ft).
Diameter: 1.30 m (4.20 ft).

More... - Chronology...


Associated Countries
Associated Engines
Associated Launch Vehicles
  • R-21 Russian submarine-launched ballistic missile. First flight 1962. NATO code Serb may apply to SS-N-6 instead. First subsurface launched SLBM (development began at OKB- 586 and transferred to SKB-385). 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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