RD-855
This article may be too technical for most readers to understand.(July 2016) |
Country of origin | Soviet Union |
---|---|
First flight | December 16, 1965 |
Last flight | January 30, 2009 |
Designer | Yuzhnoye Design Bureau |
Manufacturer | Yuzhmash |
Application | Vernier |
Associated LV | R-36, Tsyklon-2 and Tsyklon-3 |
Status | Out of production |
Liquid-fuel engine | |
Propellant | N2O4 / UDMH |
Mixture ratio | 1.97 |
Cycle | Gas generator |
Configuration | |
Chamber | 4 |
Performance | |
Thrust, vacuum | 328 kN (74,000 lbf) |
Thrust, sea-level | 285.4 kN (64,200 lbf) |
Chamber pressure | 6.570 MPa (952.9 psi) |
Specific impulse, vacuum | 292 s (2.86 km/s) |
Specific impulse, sea-level | 254 s (2.49 km/s) |
Burn time | Up to 127 s |
Restarts | 1 |
Gimbal range | ±41° |
Dimensions | |
Length | 1.74 m (5 ft 9 in) |
Diameter | 3.81 m (12.5 ft) |
Dry mass | 320 kg (710 lb) |
Used in | |
R-36, Tsyklon-2 and Tsyklon-3 first stage vernier | |
References | |
References | [1][2][3] |
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]
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
- R-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
- ^ "RD-855". Encyclopedia Astronautica. Archived from the original on April 30, 2002. Retrieved 2016-07-06.
- ^ a b c Pillet, Nicolas. "Tsiklone - Le premier étage" [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