Encyclopedia Astronautica
A-925-2


N2O4/UDMH rocket stage.

Status: Active.
Height: 7.00 m (22.90 ft).
Diameter: 2.57 m (8.43 ft).
Number: 4 .

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Associated Countries
Associated Engines
Associated Launch Vehicles
  • 51T6 Russian anti-ballistic missile. Exo-atmospheric interceptor component of A-135 ABM system. More...

Associated Manufacturers and Agencies
  • Stechkin Russian manufacturer of rocket engines. Stechkin Design Bureau, Russia. 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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