YF-40

YF-40B
Country of originChina
First flight1995-06-01
DesignerAcademy of Aerospace Liquid Propulsion Technology
Associated LVLong March 1D, Long March 4
StatusIn Production
Liquid-fuel engine
PropellantN2O4 / UDMH
Mixture ratio2.14
CycleGas Generator
Configuration
Chamber2
Nozzle ratio55
Performance
Thrust, vacuum103 kN (23,000 lbf)
Chamber pressure4.6 MPa (670 psi)
Specific impulse, vacuum303 seconds (2.97 km/s)
Burn time412s
Gimbal range±4.5°
Dimensions
Length120 centimetres (47 in)
Diameter63 centimetres (25 in)
Dry mass83 kg (183 lb)
Used in
Long March 1D second stage and Long March 4 third stage.
References
References[1][2][3][4][5][6]

The YF-40 is a Chinese liquid rocket engine burning N2O4 and UDMH in a gas generator cycle. It has dual gimbaling combustion chambers.

Originally it was developed for the Long March 1D second stage.[6] It is used on the third stage of the Long March 4 family of launch vehicles.[1][3][7]

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  3. ^ a b Cite error: The named reference gunter-lm4 was invoked but never defined (see the help page).
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  6. ^ a b Cite error: The named reference sd-lm1 was invoked but never defined (see the help page).
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