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YF-40

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YF-40B
Liquid-fuel engine
Country of origin	China
First flight	1995-06-01
Designer	Academy of Aerospace Liquid Propulsion Technology
Associated LV	Long March 1D, Long March 4
Status	In Production
Propellant	N₂O₄ / UDMH
Mixture ratio	2.14
Cycle	Gas Generator
Configuration
Chamber	2
Nozzle ratio	55
Performance
Thrust, vacuum	103 kN (23,000 lbf)
Chamber pressure	4.6 MPa (670 psi)
Specific impulse, vacuum	303 seconds (2.97 km/s)
Burn time	412s
Gimbal range	±4.5°
Dimensions
Length	120 centimetres (47 in)
Diameter	63 centimetres (25 in)
Dry weight	83 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]

References[edit]

^ ^a ^b "Long March". Rocket and Space Technology. Retrieved 2015-07-08.

^ "YF-40". Encyclopedia Astronautica. Archived from the original on 2015-08-24. Retrieved 2015-07-15.

^ ^a ^b Gunter Dirk Krebs. "CZ-4 (Chang Zheng-4)". Gunter's Space Page. Retrieved 2015-07-15.

^ Sutton, George Paul (November 2005). "Liquid Rocket Propellant Engines in the People's Republic of China". History of Liquid Propellant Rocket Engines. AIAA. p. 873. ISBN 978-1563476495. Retrieved 2015-07-15.

^ Mowthorpe, Matthew (2004). "Chinas Military Space Program". The Militarization and Weaponization of Space. Lexington Books. p. 90. ISBN 978-0739107133. Retrieved 2015-07-15.

^ ^a ^b "Chang Zheng-1 (Long March-1)". SinoDefence. Archived from the original on 2015-07-16. Retrieved 2015-07-15.

^ Harvey, Brian (2004). "Launch Centers Rockets and Engines". China's Space Program — From Conception to Manned Spaceflight. Springer Science & Business Media. p. 231. ISBN 978-1852335663. Retrieved 2015-07-15.