Encyclopedia Astronautica
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.

Thrust (sl): 697.400 kN (156,782 lbf). Thrust (sl): 71,115 kgf. Chamber Pressure: 71.00 bar. Area Ratio: 10.

Status: Out of production.
Diameter: 3.35 m (10.99 ft).
Thrust: 762.00 kN (171,304 lbf).
Specific impulse: 295 s.
Specific impulse sea level: 270 s.
Burn time: 127 s.
Number: 12 .

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Associated Countries
See also
Associated Launch Vehicles
  • 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 Manufacturers and Agencies
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...

Associated Stages
  • FB-1-2 N2O4/UDMH propellant rocket stage. Loaded/empty mass 38,300/3,500 kg. Thrust 761.90 kN. Vacuum specific impulse 295 seconds. More...

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