YF-20

YF-20
A YF-20K engine
Country of originChina
First flight1995-06-01
DesignerAcademy of Aerospace Liquid Propulsion Technology
Associated LVFeng Bao 1, Long March 2, Long March 3 and Long March 4
StatusIn Production
Liquid-fuel engine
PropellantN2O4 / UDMH
CycleGas Generator
Configuration
Chamber1
Nozzle ratio12.69
Performance
Thrust, vacuum816.3 kN (183,500 lbf)
Thrust, sea-level731.5 kN (164,400 lbf)
Chamber pressure7.1 MPa (1,030 psi)
Specific impulse, vacuum289 seconds (2.83 km/s)
Specific impulse, sea-level259 seconds (2.54 km/s)
Burn time160s
Gimbal range±10° (when integrated on the YF-21B)
Dimensions
Diameter84 centimetres (33 in)
Dry mass712.5 kg (1,571 lb)
Used in
Feng Bao 1 first stage and Long March 2C, Long March 2D, Long March 2E, Long March 3, Long March 3A, Long March 3B and Long March 4A, boosters, first stage and second stage.
References
References[1][2][3][4]

The YF-20 is a Chinese liquid-fuel rocket engine burning N2O4 and UDMH in a gas generator cycle. It is a basic engine which when mounted in a four engine module forms the YF-21. The high altitude variation is known as the YF-22 is normally paired with the YF-23 vernier to form the YF-24 propulsion module for second stages. New versions when used individually for booster applications are called YF-25.[5][6]

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