Encyclopedia Astronautica

N2O4/UDMH propellant rocket stage. Loaded/empty mass 38,300/3,500 kg. Thrust 761.90 kN. Vacuum specific impulse 295 seconds.

Cost $ : 2.000 million.

Status: Retired 1981.
Gross mass: 38,300 kg (84,400 lb).
Unfuelled mass: 3,500 kg (7,700 lb).
Height: 7.40 m (24.20 ft).
Diameter: 3.35 m (10.99 ft).
Span: 3.35 m (10.99 ft).
Thrust: 761.90 kN (171,282 lbf).
Specific impulse: 295 s.
Specific impulse sea level: 270 s.
Burn time: 127 s.
Number: 24 .

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Associated Countries
Associated Engines
  • YF-22/23 Beijing Wan Yuan N2O4/UDMH rocket engine. 762 kN. Out of production. Cluster of YF-22 and 4 x YF-23 verniers. Isp=295s. Boosted CZ-2A, FB-1. First flight 1972. More...

Associated Launch Vehicles
  • DF-5 Development of the the DF-5 began in 1964. The goal was an ICBM capable of reaching the United States. Although deployed in very limited numbers as an ICBM, this rocket became the basis for an entire family of space launch vehicles and the foundation of the Chinese space program. More...
  • FB-1 Chinese orbital launch vehicle. The FB-1, like the CZ-2 launch vehicle begun the following year, was a two-stage booster developed from the DF-5 intercontinental ballistic missile. Payload for the booster was the JSSW, believed to have been a television-transmission military reconnaissance satellite. The incredible decision to develop two nearly identical rockets concurrently can be blamed on the turbulent factional politics after the Cultural Revolution. More...
  • CZ-2A Chinese orbital launch vehicle. The CZ-2 was originally designed for launch of the FSW-1 recoverable military reconnaissance satellite. 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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