The YF-40 is 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 has dual gimbaling combustion chambers. Originally it was developed for 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. ...

second stage. It is used on the third stage of the Long March 4 family of launch vehicles.

References

Rocket engines of China Rocket engines using hypergolic propellant Rocket engines using the gas-generator cycle {{rocket-stub