RD-0256 (РД-0256)
Country of originUSSR
First flight1981-12-27
DesignerOKB-154
Associated LVR-36M and Dnepr
PredecessorRD-0229
StatusIn Service
Liquid-fuel engine
PropellantN2O4 / UDMH
Mixture ratio2.6
CycleOxidizer Rich Staged combustion
Configuration
Chamber1
Performance
Thrust755 kilonewtons (170,000 lbf)
Used in
RD-0255 Propulsion Module
References
References[1][2][3]
RD-0257 (РД-0257)
Country of originUSSR
First flight1981-12-27
DesignerOKB-154
Associated LVR-36M and Dnepr
PredecessorRD-0230
StatusIn Service
Liquid-fuel engine
PropellantN2O4 / UDMH
CycleGas Generator
Configuration
Chamber4
Used in
RD-0255 Propulsion Module
References
References[1][2][3]

The RD-0255 is a propulsion module composed of an RD-0256 main engine and a RD-0257 vernier engine. Both are liquid rocket engine, burning UDMH in N2O4. The RD-0256 main engine operates in the oxidizer rich staged combustion cycle, while the vernier RD-0257 uses the simpler gas generator cycle. It was used on the R-36MUTTKh (GRAU:15A18) and R-36M2 (GRAU:15A18M). Subsequently, it has been in the Dnepr second stage and as of 2016 it is still in active service.[4][5]

The RD-0256 is an improved version of the RD-0228 (GRAU: 15D84), itself composed of an RD-0229 (GRAU: 15D84) main engine and a RD-0230 (GRAU: 15D79) vernier engine.[6] The RD-0228 was developed between 1967 and 1974 for the first generation of R-36M (GRAU: 15D83) ICBM second stage, but was replaced on subsequent iterations by the RD-0256.[7] The RD-0228 debut was on January 21, 1973. With the START I and START II the RD-0228 was retired and its successor, the RD-0256, only continued as the Dnepr.[3][7]

See also

References

  1. 1 2 "RD-0255". Encyclopedia Astronautica. Archived from the original on May 20, 2002. Retrieved 2016-07-06.
  2. 1 2 "RD-0228". Encyclopedia Astronautica. Archived from the original on June 25, 2002. Retrieved 2016-07-06.
  3. 1 2 3 "РД0228, РД0229, РД0230, РД0255, РД0256, РД0257. Межконтинентальные баллистические ракеты РС-20А, РС-20Б, РС-20В" [RD0228, RD0229, RD0230, RD0255, RD0256, RD0257. Intercontinental ballistic missile PC-20А, PC-20Б, PC-20В]. KBKhA. Archived from the original on 5 May 2014.
  4. ↑ Krebs, Gunter Dirk (2016-06-13). "Dnepr". Gunter's Space Page. Retrieved 2016-07-05.
  5. ↑ Norbert Brügge. "Dnepr, Propulsion". B14643.DE. Retrieved 2015-07-15.
  6. ↑ Krebs, Gunter Dirk (2016-05-02). "R-36M Voivode (SS-18, Satan) ICBM". Gunter's Space Page. Retrieved 2016-07-05.
  7. 1 2 Pillet, Nicolas. "Le deuxième étage de Dniepr" [The second stage of the Dnepr] (in French). Kosmonavtika.com. Retrieved 2016-07-06.


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