S5.142

The S5.142 (AKA DST-25) 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 was used in KTDU-80 propulsion module from the Soyuz-TM to the Soyuz-TMA-M, as the low thrust thruster (DPO-M). As of the Soyuz MS, KTDU-80 does not use DPO-M anymore.

The S5.142 generates of thrust with a chamber pressure of and a nozzle expansion of 45 that enables it to achieve a specific impulse of . It is rated for 300,000 starts with a total firing time of 25,000 seconds and can do single burns from 0.03 seconds to 4,000 seconds. Each unit weights .

Versions This engine has been used in crewed Russian space program since the Soyuz TM-23. There are two versions: S5.142 (AKA DST-25): Version used as DPO-M (attitude control thrusters) on the KTDU-80 unit of the Soyuz-TM up to the Soyuz-TMA-M. S5.142A: A version of the S5.142 adapted for the KVTK upper stage for the Angara rocket.

S5.142

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