RD-0255

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RD-0256 (РД-0256)
Liquid-fuel engine
Country of origin	USSR
First flight	1981-12-27
Designer	OKB-154
Associated LV	R-36M and Dnepr
Predecessor	RD-0229
Status	In Service
Propellant	N₂O₄ / UDMH
Mixture ratio	2.6
Cycle	Oxidizer Rich Staged combustion
Configuration
Chamber	1
Performance
Thrust	755 kilonewtons (170,000 lbf)
Used in
RD-0255 Propulsion Module
References
References	^[1]^[2]^[3]

RD-0257 (РД-0257)
Liquid-fuel engine
Country of origin	USSR
First flight	1981-12-27
Designer	OKB-154
Associated LV	R-36M and Dnepr
Predecessor	RD-0230
Status	In Service
Propellant	N₂O₄ / UDMH
Cycle	Gas Generator
Configuration
Chamber	4
Used in
RD-0255 Propulsion Module
References
References	^[1]^[2]^[3]

The RD-0255 (Russian: Ракетный Двигатель-0255, romanized: Raketnyy Dvigatel-0255, lit. 'Rocket Engine 0255') is a propulsion module composed of an RD-0256 main engine and a RD-0257 Vernier thruster. Both are liquid-fuel rocket engines, burning a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with dinitrogen tetroxide (N₂O₄) oxidizer. 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]

References

^ ^a ^b "RD-0255". Encyclopedia Astronautica. Archived from the original on May 20, 2002. Retrieved 2016-07-06.
^ ^a ^b "RD-0228". Encyclopedia Astronautica. Archived from the original on June 25, 2002. Retrieved 2016-07-06.
^ ^a ^b ^c "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.
^ Krebs, Gunter Dirk (2016-06-13). "Dnepr". Gunter's Space Page. Retrieved 2016-07-05.
^ Norbert Brügge. "Dnepr, Propulsion". B14643.DE. Retrieved 2015-07-15.
^ Krebs, Gunter Dirk (2016-05-02). "R-36M Voivode (SS-18, Satan) ICBM". Gunter's Space Page. Retrieved 2016-07-05.
^ ^a ^b Pillet, Nicolas. "Le deuxième étage de Dniepr" [The second stage of the Dnepr] (in French). Kosmonavtika.com. Retrieved 2016-07-06.

External links

Rocket engines and solid motors for orbital launch vehicles

Comparison of orbital rocket engines

Liquid
fuel

Cryogenic

Hydrolox (LH₂ / LOX)	China YF-73 YF-75 YF-75D YF-77 YF-79 YF-90 Europe HM7B Vinci Vulcain India CE-7.5 CE-20 Japan LE-5 LE-7 LE-9 Russia KVD-1 (RD-56) RD-0120 RD-0146 United States BE-3U BE-7 J-2 RL10 RS-25 RS-68
Methalox (CH₄ / LOX)	China BF-20 Lingyun Longyun TQ-11 TQ-12 TQ-15A YF-209 YF-215 United States BE-4 Raptor Archimedes Aeon 1 Aeon R Russia RD-0169 Europe Prometheus M-10

Semi-
cryogenic

Kerolox
(RP-1 / LOX)

China
- TH-11
- TH-12
- YF-100
- YF-102
- YF-115
- YF-130
- Welkin
India
- SCE-200
Russia
- NK-15
- NK-33, 44
- RD-58
- RD-0105, 0109
- RD-0107, 0108, 0110
- RD-0110R
- RD-0124
- RD-107, 108, 117, 118
- RD-120
- RD-170, 171
- RD-180
- RD-191, 151, 181
- RD-193
- S1.5400
Spain
- TEPREL
Ukraine
- RD-8
- RD-801
- RD-810
United States
- F-1
- H-1
- Kestrel
- LR-79
- LR89
- LR105
- LR70-NA , S-3D
- Merlin
- RS-27
- RS-27A
- RS-56
- S-3D
- Rutherford
- XLR50

Storable

Hypergolic (Aerozine,
UH 25, MMH, or UDMH
/ N₂O₄, MON, or HNO₃)

China
Europe
- Aestus
- Astris
- Vexin
- Viking
India
- PS4
- Vikas
Israel
- LK-4
North Korea
- Paektusan LRE along other LREs
Russia
Ukraine
- RD-843
- RD-854, 861
- RD-855
- RD-856
- RD-864, 869
United States
- AJ10
- LR-87
- LR-91
- RS-88*
- TR-201
- XLR81*

Other

Russia
- RD-109, 119
- RD-211 to 214
UK
- Gamma
United States
- Curie
- RS-88*
- XLR81*

Solid
fuel

China
- FG-02
- FG-36
- FG-46
- FG-47
- SpaB-65
- SpaB-140C
Europe
- Mage 1
- P-4
- P-6
- PAP
- P80
- P120C
- P230
- Topaze
- Waxwing
- Zefiro 9
- Zefiro 23
- Zefiro 40
India
- S7
- S9
- S12
- S139
- S200
Iran
- Salman
- Rafe
Israel
- LK-1
- RSA-3
Japan
- KM-V1
- KM-V2b
- M-14
- M-24
- M-34
- M-34c
- SRB-A
United States
- AJ-60A
- Algol
- Castor 30
- GEM
- Orbus-6
- Orbus-21
- Orion
- Space Shuttle SRB
- Star 37
- Star 48
- UA120
- SRMU
- X-248
- X-254

* Different versions of the engine use different propellant combinations
Engines in italics are under development

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