YF-1

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]

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]

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.

Versions

The basic engine has been used since the DF-3 rocket and has been the main propulsion of the Long March 1 orbital launch vehicles.[2]

Modules

While the basic engine was used multiple times, it was only used as a single engine for booster application. It is usually bundled into modules of multiple engines.

The relevant modules for first stage application are:

  • YF-2: A module comprising four YF-1. Flown originally on the DF-3.[3]
  • YF-2A: A module comprising four YF-1A. Improved version. Used on the DF-3A, DF-4 and Long March 1.[3][2]
  • YF-2B: A module comprising four YF-1B. Improved version. Final version used on the Long March 1D.[2]

See also

References
  1. Norbert Bgügge. "Asian space-rocket liquid-propellant engines". B14643.DE. Archived from the original on 2015-07-17. Retrieved 2015-07-25.
  2. Norbert Bgügge. "Propulsion CZ-1". B14643.DE. Retrieved 2015-07-25.
  3. Norbert Bgügge. "The Chinese DF-3 missile". B14643.DE. Archived from the original on 2015-10-17. Retrieved 2015-07-25.
  4. "Long March". Rocket and Space Technology. Retrieved 2015-07-25.
  5. "CZ-1". Encyclopedia Astronautica. Archived from the original on May 1, 2002. Retrieved 2015-07-25.
  6. "YF-2A". Encyclopedia Astronautica. Archived from the original on 2015-08-24. Retrieved 2015-07-25.
  7. "YF-3". Encyclopedia Astronautica. Archived from the original on 2015-08-24. Retrieved 2015-07-25.
  8. Harvey, Brian (2004). "Launch Centers Rockets and Engines". China's Space Program — From Conception to Manned Spaceflight. Springer Science & Business Media. p. 230. ISBN 978-1852335663. Retrieved 2015-07-15.
  9. Mowthorpe, Matthew (2004). "Chinas Military Space Program". The Militarization and Weaponization of Space. Lexington Books. p. 90. ISBN 978-0739107133. Retrieved 2015-07-15.
  10. "Dong Feng-3 (CSS-2)". SinoDefence. Archived from the original on 2015-11-23. Retrieved 2015-07-25.
  11. "Dong Feng-4 (CSS-3)". SinoDefence. Archived from the original on 2015-11-23. Retrieved 2015-07-25.
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