The RD-855 (GRAU Index 8D68M), also known as the RD-68M, is a four-nozzle liquid-fuelrocketvernier engine, burning N2O4 and UDMH in a gas generator cycle.[3] It was used on the R-36, Tsyklon-2 and Tsyklon-3 first stage as thrust vector control by gimbaling of its nozzle.[3] The engine is distributed through a cylindrical structure that is integrated around the main engine RD-251 module. The structure includes aerodynamic protection for the nozzles and small retro engines to assure the separation of the first stage.[2] The engine was ignited two second before the RD-251 main engine.[2]
The engine was serially produced between 1965 and 1992. It was first launched on December 16, 1965 on an R-36 and its last launch was on January 30, 2009 with the last launch of the Tsyklon-3. The production capability was restarted for the Tsyklon-4 but with the apparent cancellation of the program the engine would still be out of production.[4]
this, article, technical, most, readers, understand, please, help, improve, make, understandable, experts, without, removing, technical, details, july, 2016, learn, when, remove, this, template, message, grau, index, 8d68m, also, known, four, nozzle, liquid, f. This article may be too technical for most readers to understand Please help improve it to make it understandable to non experts without removing the technical details July 2016 Learn how and when to remove this template message The RD 855 GRAU Index 8D68M also known as the RD 68M is a four nozzle liquid fuel rocket vernier engine burning N2O4 and UDMH in a gas generator cycle 3 It was used on the R 36 Tsyklon 2 and Tsyklon 3 first stage as thrust vector control by gimbaling of its nozzle 3 The engine is distributed through a cylindrical structure that is integrated around the main engine RD 251 module The structure includes aerodynamic protection for the nozzles and small retro engines to assure the separation of the first stage 2 The engine was ignited two second before the RD 251 main engine 2 RD 855 RD 855 Country of originSoviet UnionFirst flightDecember 16 1965Last flightJanuary 30 2009DesignerYuzhnoye Design BureauManufacturerYuzhmashApplicationVernierAssociated LVR 36 Tsyklon 2 and Tsyklon 3StatusOut of productionLiquid fuel enginePropellantN2O4 UDMHMixture ratio1 97CycleGas generatorConfigurationChamber4PerformanceThrust vacuum328 kN 74 000 lbf Thrust sea level285 4 kN 64 200 lbf Chamber pressure6 570 MPa 952 9 psi Specific impulse vacuum292 s 2 86 km s Specific impulse sea level254 s 2 49 km s Burn timeUp to 127 sRestarts1Gimbal range 41 DimensionsLength1 74 m 5 ft 9 in Diameter3 81 m 12 5 ft Dry weight320 kg 710 lb Used inR 36 Tsyklon 2 and Tsyklon 3 first stage vernierReferencesReferences 1 2 3 The engine was serially produced between 1965 and 1992 It was first launched on December 16 1965 on an R 36 and its last launch was on January 30 2009 with the last launch of the Tsyklon 3 The production capability was restarted for the Tsyklon 4 but with the apparent cancellation of the program the engine would still be out of production 4 See also EditR 36 The Soviet ICBM for which the RD 855 was created Tsyklon 2 A Soviet small rocket that uses the RD 855 Tsyklon 3 A Soviet small rocket that uses the RD 855 Tsyklon 4 A Ukrainian small rocket project that would have used the RD 855 Yuzhnoe Design Bureau The RD 855 designer bureau References Edit RD 855 Encyclopedia Astronautica Archived from the original on April 30 2002 Retrieved 2016 07 06 a b c Pillet Nicolas Tsiklone Le premier etage Tsyklon The first stage in French Kosmonavtika com Retrieved 2016 07 06 a b c RD 855 Yuzhnoye Archived from the original on 29 May 2015 Krebs Gunter Dirk 2016 04 24 Tsiklon Gunter s Space Page Retrieved 2016 07 05 External links EditYuzhnoye Design Bureau English language home page Yuzhmash Home Page This rocketry article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title RD 855 amp oldid 1100161616, wikipedia, wiki, book, books, library,
