YF-1

YF-1B
Country of originChina
Date1958-1969
DesignerAcademy of Aerospace Liquid Propulsion Technology, Ren Xinmin, Mo Tso-hsin, Zhang Guitian
Associated LVDF-3A, DF-4 and Long March 1
PredecessorС2.1100
SuccessorYF-20
StatusRetired
Liquid-fuel engine
PropellantN2O4 / UDMH
CycleGas Generator
Configuration
Chamber1
Nozzle ratio10
Performance
Thrust, vacuum303.6 kN (68,300 lbf)
Thrust, sea-level275.3 kN (61,900 lbf)
Chamber pressure7.1 MPa (1,030 psi)
Specific impulse, vacuum267.4 seconds (2.622 km/s)
Specific impulse, sea-level242.5 seconds (2.378 km/s)
Burn time140s
Dimensions
Diameter56 centimetres (22 in)
Used in
DF-3A, DF-4 and Long March 1 first stage.
References
References[1][2][3][4][5][6] [7][8]

The YF-1 was a Chinese liquid 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-2. It was used as the basis for developing a high altitude version known as the YF-3.[2][9]

Some authors state that it was a direct copy of С.2.1100/С.2.1150 La-350 booster engine developed by Isayev OKB-2 (NII-88).[10] What is known is that the engine development had great trouble with combustion instabilities and it took a long time to have a reliable combustion.

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