Definitions

yf

YF-73

YF-73 (Rocket Engine)

The YF-73 is China's first successful, cryogenic, gimballed engine, using liquid hydrogen (LH2) fuel and liquid oxygen (LOX) oxidizer. It was developed in the early 1980s and first flight was in 1984.

Specifications

  • Vacuum thrust: 44.15 kN
  • Vacuum specific impulse: 10 s
  • Burn time: 100 s
  • Engine weight: 236 kg
  • Exit to Throat Area ratio: 40 to 1
  • Propellants: LOX & LH2
  • Mixture ratio: 9.00


  • Design: Gas-generator cycle
  • Height: 1.48 m
  • Diameter: 2.2 m
  • Chambers: 10
  • Chamber Pressure: 25.98 bar
  • Thrust to Weight Ratio: 18.62(total)
  • Restartable: Yes (1 time)


  • Contractor: CALT
  • Vehicle Application: Long March / CZ-3 - 3rd stage
  • Flown: 215 times
  • Status: Active

References

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