The YF-1 was a

Chinese Chinese may refer to: * Something related to China * Chinese people, people identified with China, through nationality, citizenship, and/or ethnicity **Han Chinese, East Asian ethnic group native to China. **'' Zhonghua minzu'', the supra-ethnic ...

liquid Liquid is a state of matter with a definite volume but no fixed shape. Liquids adapt to the shape of their container and are nearly incompressible, maintaining their volume even under pressure. The density of a liquid is usually close to th ...

rocket engine A rocket engine is a reaction engine, producing thrust in accordance with Newton's third law by ejecting reaction mass rearward, usually a high-speed Jet (fluid), jet of high-temperature gas produced by the combustion of rocket propellants stor ...

burning N₂O₄ and

UDMH Unsymmetrical dimethylhydrazine (abbreviated as UDMH; also known as 1,1-dimethylhydrazine, heptyl or Geptil) is a chemical compound with the formula H2NN(CH3)2 that is primarily used as a rocket propellant. At room temperature, UDMH is a colorle ...

in a

gas generator A gas generator is a device for generating gas. A gas generator may create gas by a chemical reaction or from a solid or liquid source, when storing a pressurized gas is undesirable or impractical. The term often refers to a device that uses a ...

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 TsNIIMash () is a Russian rocket and spacecraft scientific center, dealing with all phases of development from conceptual design to flight test. The Institute is the main analytical center of Roskosmos in the field of system-wide studies of the ...

). 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 The DF-3A (NATO: CSS-2) is a Chinese Liquid-propellant rocket, liquid-fueled, single-stage, nuclear intermediate-range ballistic missile that entered service in 1971. In 1988 China sold several dozen (reportedly between 36 and 60) DF-3A missiles ...

rocket and has been the main propulsion of the

Long March 1 The Long March 1 (长征一号), also known as the Changzheng-1 (CZ-1), was the first member of China's Long March 1 (rocket family), Long March rocket family. Like the U.S.'s and the Soviet Union's first rockets, it was based on a class of ba ...

orbital launch vehicles. * YF-1: Core engine. Flown originally on the

. Used

/ 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 The DF-3A (NATO: CSS-2) is a Chinese liquid-fueled, single-stage, nuclear intermediate-range ballistic missile that entered service in 1971. In 1988 China sold several dozen (reportedly between 36 and 60) DF-3A missiles to Saudi Arabia. Saudi A ...

DF-4 The Dong Feng 4 () or DF-4 (also known as the CSS-3) is a first-generation two-stage Chinese intercontinental ballistic missile with liquid fuel (Nitric acid/Unsymmetrical dimethylhydrazine). It was thought to be deployed in limited numbers in ...

and

. * YF-1B: Core engine. Improved version used on the

Long March 1D The Long March 1D was a member of China's Long March rocket family. During the 1990s China Academy of Launch Vehicle Technology, CALT developed an improved version of the DF-4 to test the Atmospheric entry, reentry vehicle warheads of the DF-31. ...

. Switched propellants to

/ N₂O₄ * YF-3: Upper stage version. Used on the

. * YF-3A: Improved upper stage version. Used on the

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

. * YF-2A: A module comprising four YF-1A. Improved version. Used on the

and

. * YF-2B: A module comprising four YF-1B. Improved version. Final version used on the

References

{{DEFAULTSORT:YF-1 Rocket engines of China Rocket engines using hypergolic propellant Rocket engines using the gas-generator cycle

Versions

Modules

See also

References