The 11D428A-16 (manufacturer's name RDMT-135M) is a liquid pressure-fed rocket engine burning N2O4/UDMH with an O/F of 1.85. It is used for crew-rated spacecraft propulsion applications. It is currently used in the KTDU-80 spacecraft propulsion module. The previous version, the 11D428A (manufacturer's name RDMT-135) is still used as the reaction control system thrusters of the Zvezda ISS module. The 11D428A-16 generates of thrust with a chamber pressure of and achieves a specific impulse 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 times. The three main versions are: 11D428: Delivered in 1970 for use in Salyut 1. 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 KTDU-80 since Soyuz TM-28. 11D428AF-16:Thruster version developed for the Fobos-Grunt planetary sample mission.
Engine 11D428A 11D428A-16 11D428AF-16Development 1968–1974 1968–1977 1993–1997 Engine Type Liquid pressure-fed rocket engine Propellant N2O4/UDMH with 1.85 O/F ratioThrust isp 1:56 Exp. Nozzle:1:150 Exp. Nozzle: Nominal Inlet Pressure Nozzle 1 1 1Burn time 570s 2700s 50,000sIgnitions 500,000Ignition time 0.03 to 2000sMass Length Diameter Uses Soyuz 7K-S, Soyuz-T and Soyuz-TM Soyuz-TMA, Salyut-6, Salyut-7, Mir Core Module, Zvezda Fobos-Grunt References
See also KB KhIMMASH KTDU-35 KTDU-80 Soyuz-T Soyuz-TM
References
External links KB KhIMMASH Official Page (in Russian)