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|Country of origin||China|
|Manufacturer||China Academy of Launch Vehicle Technology (CALT)|
|Propellant||Liquid oxygen / Liquid hydrogen|
|Thrust (vac.)||44.15 kilonewtons (9,930 lbf)|
|Thrust (SL)||11.00 kilonewtons (2,470 lbf)|
|Chamber pressure||25.9 bars (2,590 kPa)|
|Isp (vac.)||420 seconds (4.1 km/s)|
|Isp (SL)||425 seconds (4.17 km/s)|
|Burn time||800 seconds (13 min)|
|Length||1.44 metres (4 ft 9 in)|
|Diameter||2.2 metres (7 ft 3 in)|
|Dry weight||236 kilograms (520 lb)|
|Long March 3 3rd stage|
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.
- "YF-23". Encyclopedia Astronautica. Retrieved 6 November 2013.