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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 N ₂ O ₄ . 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 [ edit ]

• R-36M ? A Soviet ICBM that used the RD-0228 and RD-0255.
• Dnepr ? Small launch vehicle designed by Yuzhmash that uses the RD-0255.
• KBKhA ? The RD-0228 and RD-0255 design bureau.
• Vernier Engine
• Rocket engine

References [ edit ]

External links [ edit ]

• KbKhA official information on the engine. (Archived)
• Encyclopedia Astronautica information on the propulsion module. (Archived)

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