The 11D428A-16 (manufacturer's name RDMT-135M) is a

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/

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 ...

with an O/F of 1.85. It is used for crew-rated

spacecraft propulsion Spacecraft propulsion is any method used to accelerate spacecraft and artificial satellites. In-space propulsion exclusively deals with propulsion systems used in the vacuum of space and should not be confused with space launch or atmospheric e ...

applications. It is currently used in the

KTDU-80 The KTDU-80 (Russian language, Russian: ) is the latest of a family of integrated propulsion system that KB KhIMMASH has implemented for the Soyuz (spacecraft), Soyuz since the Soyuz-T. It integrates main propulsion, Reaction control system, RCS a ...

spacecraft propulsion module. The previous version, the 11D428A (manufacturer's name RDMT-135) is still used as the

reaction control system A reaction control system (RCS) is a spacecraft system that uses Thrusters (spacecraft), thrusters to provide Spacecraft attitude control, attitude control and translation (physics), translation. Alternatively, reaction wheels can be used for at ...

thrusters of the Zvezda ISS module. The 11D428A-16 generates of thrust with a chamber pressure of and achieves a

specific impulse Specific impulse (usually abbreviated ) is a measure of how efficiently a reaction mass engine, such as a rocket engine, rocket using propellant or a jet engine using fuel, generates thrust. In general, this is a ratio of the ''Impulse (physics), ...

of . It is rated for 500,000 starts with a certified ignition time of 0.03 seconds to 2000 seconds. Each unit weights .

Versions

This engine has been used with certain variations in the crewed Russian space program since the Salyut 6 in

Soviet The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

times. The three main versions are: * 11D428: Delivered in 1970 for use in

Salyut 1 Salyut 1 (), also known as DOS-1 (Durable Orbital Station 1), was the world's first space station. It was launched into low Earth orbit by the Soviet Union on April 19, 1971. The Salyut programme, ''Salyut'' program subsequently achieved five m ...

. * 11D428M: Version developed for the Yantar-2K platform. It reached space on the first launch, Kosmos 697 on August 6, 1974. * 11D428A (AKA RDMT-135): Version developed for the Soyuz 7K-S, it flew on Kosmos 670, Kosmos 772 and Kosmos 869. Later used on the KTDU-426. * 11D428A-10: Thruster used on the Zvezda ISS Module. Originally developed for the Mir Core Module. * 11D428A-14: Thruster used on the Zvezda ISS module. * 11D428A-16 (AKA RDMT-135M): Improved specific impulse version. Used on the

since Soyuz TM-28. * 11D428AF-16:Thruster version developed for the Fobos-Grunt planetary sample mission.

References

External links

KB KhIMMASH Official Page (in Russian)
{{Orbital spacecraft rocket engines Rocket engines of Russia Rocket engines of the Soviet Union Rocket engines using hypergolic propellant Rocket engines using the pressure-fed cycle NIIMash rocket engines

Versions

See also

References

External links