RD-0255

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]

  1. ^ a b Cite error: The named reference ea-rd0255 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference ea-rd0228 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference kbkha-rd0255 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gunter-dnepr was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference b14643-dneprpropulsion was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference gunter-r36m was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference kosmo-dniepr2 was invoked but never defined (see the help page).