|Country of origin||China|
|Designer||Academy of Aerospace Liquid Propulsion Technology, Ren Xinmin, Mo Tso-hsin, Zhang Guitian|
|Associated L/V||DF-3A, DF-4 and Long March 1|
|Propellant||N2O4 / UDMH|
|Thrust (vac.)||303.6 kN (68,300 lbf)|
|Thrust (SL)||275.3 kN (61,900 lbf)|
|Chamber pressure||7.1 MPa (1,030 psi)|
|Isp (vac.)||267.4 seconds (2.622 km/s)|
|Isp (SL)||242.5 seconds (2.378 km/s)|
|Diameter||56 centimetres (22 in)|
|DF-3A, DF-4 and Long March 1 first stage.|
The YF-1 was a Chinese liquid rocket engine burning N2O4 and UDMH in an 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.
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). 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 1
- Modules 2
- See also 3
- References 4
- 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.
- YF-1A: Core engine. Improved version that would power the DF-3A, DF-4 and Long March 1.
- YF-1B: Core engine. Improved version used on the Long March 1D. Switched propellants to UDMH/N2O4
- YF-3: Upper stage version. Used on the DF-4.
- YF-3A: Improved upper stage version. Used on the Long March 1.
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.
- YF-2A: A module comprising four YF-1A. Improved version. Used on the DF-3A, DF-4 and Long March 1.
- YF-2B: A module comprising four YF-1B. Improved version. Final version used on the Long March 1D.
- Norbert Bgügge. "Asian space-rocket liquid-propellant engines". B14643.DE. Retrieved 2015-07-25.
- Norbert Bgügge. "Propulsion CZ-1". B14643.DE. Retrieved 2015-07-25.
- Norbert Bgügge. "The Chinese DF-3 missile". B14643.DE. 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. Retrieved 2015-07-25.
- "YF-3". Encyclopedia Astronautica. 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.
- Mowthorpe, Matthew (2004). "Chinas Military Space Program". The Militarization and Weaponization of Space. Lexington Books. p. 90.
- "Dong Feng-3 (CSS-2)". SinoDefence. Retrieved 2015-07-25.
- "Dong Feng-4 (CSS-3)". SinoDefence. Retrieved 2015-07-25.