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
Academy of Aerospace Liquid Propulsion Technology, Ren Xinmin, Mo Tso-hsin, Zhang Guitian
Associated L/V
DF-3A, DF-4 and Long March 1
С2.1100
Liquid-fuel engine
N2O4 / UDMH
Nozzle ratio
Thrust (vac.)
303.6 kN (68,300 lbf)
Thrust (SL)
Chamber pressure
7.1 MPa (1,030 psi)
Isp (vac.)
267.4 seconds (2.622 km/s)
Isp (SL)
Burn time
56 centimetres (22 in)
DF-3A, DF-4 and Long March 1 first stage.
[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.
VersionsEdit
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]
YF-1: Core engine. Flown originally on the DF-3. Used UDMH/AK27S as propellant. Allegedly a copy of OKB-2's С.2.1150.[3][10]
YF-1A: Core engine. Improved version that would power the DF-3A, DF-4 and Long March 1.[3][2][10][11]
YF-1B: Core engine. Improved version used on the Long March 1D. Switched propellants to UDMH/N2O4[2]
YF-3: Upper stage version. Used on the DF-4.[2]
YF-3A: Improved upper stage version. Used on the Long March 1.[2]
ModulesEdit
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]
DF-3A
DF-4
Long March 1 (rocket family)
Long March 1
Long March 1D
^ Norbert Bgügge. "Asian space-rocket liquid-propellant engines". B14643.DE. Archived from the original on 2015-07-17. Retrieved 2015-07-25.
^ a b c d e f g h i Norbert Bgügge. "Propulsion CZ-1". B14643.DE. Retrieved 2015-07-25.
^ a b c d e Norbert Bgügge. "The Chinese DF-3 missile". B14643.DE. Archived from the original on 2015-10-17. Retrieved 2015-07-25.
^ "Long March". Rocket and Space Technology. Retrieved 2015-07-25.
^ "CZ-1". Encyclopedia Astronautica. Retrieved 2015-07-25.
^ "YF-2A". Encyclopedia Astronautica. Archived from the original on 2015-08-24. Retrieved 2015-07-25.
^ "YF-3". Encyclopedia Astronautica. Archived from the original on 2015-08-24. Retrieved 2015-07-25.
^ 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.
^ 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 c "Dong Feng-3 (CSS-2)". SinoDefence. Archived from the original on 2015-11-23. Retrieved 2015-07-25.
^ "Dong Feng-4 (CSS-3)". SinoDefence. Archived from the original on 2015-11-23. Retrieved 2015-07-25.
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