The RD-843 is a Ukrainian single nozzle liquid propellant rocket engine. It burns a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with dinitrogen tetroxide (N2O4) oxidizer. It is pressure-fed. It is rated for up to 5 restarts, and can gimbal up to 10 degrees in each direction.[2]
| Country of origin | Ukraine |
|---|---|
| First flight | 2012-02-13 |
| Designer | Yuzhnoye Design Bureau |
| Manufacturer | Yuzhmash |
| Application | Upper stage |
| Associated LV | Vega, Vega C |
| Predecessor | RD-869 |
| Status | In production |
| Liquid-fuel engine | |
| Propellant | N2O4 / UDMH |
| Mixture ratio | 2.0 |
| Cycle | Pressure-fed |
| Configuration | |
| Chamber | 1 |
| Performance | |
| Thrust, vacuum | 2.452 kN (551 lbf) |
| Chamber pressure | 2.04 MPa (296 psi) |
| Specific impulse, vacuum |
|
| Burn time |
|
| Restarts | Up to 5 |
| Gimbal range | ±10° |
| Dimensions | |
| Dry mass | 15.93 kg (35.1 lb) |
| Used in | |
| AVUM, AVUM+ | |
| References | |
| References | [1][2][3][4] |
It was developed by Yuzhnoye Design Bureau for Avio and is manufactured by Yuzhmash. It uses the RD-869 thrust chamber, the old Soviet ICBM SS-18 final stage engine from which it is evolved, and which was also designed by Yuzhnoye. The RD-843 ground test campaign included 74 tests, 140 ignitions, reaching a total of 8,201 seconds, which is approximately 12 service lives on 4 engines. As of June 2020 it has been successfully used on 14 orbital launches.[5]
The Vega and Vega C uses it as the main engine on its AVUM (Attitude & Vernier Upper Module) fourth stage which it calls the MEA (short for Main Engine AVUM).[6]
See also
edit- AVUM - The upper stage of the Vega rocket that uses the RD-843 as its main engine.
- Vega - The ESA small rocket that uses AVUM.
- Yuzhnoe Design Bureau - The RD-843 designer bureau.
- Yuzhmash - A multi-product machine-building company that's closely related to Yuzhnoe and manufactures the RD-843.
Notes
edit- ^ Engine can burn up to 612.5 seconds per burn. Maximum cumulative burn time of 924.8 seconds.
References
edit- ^ "Liquid rocket engine RD-843". Yuzhmash. Retrieved 2015-05-29.
- ^ a b "RD-843". Yuzhnoye. Archived from the original on 2020-12-02. Retrieved 2015-05-29.
- ^ Degtyarev, Alexander; Kushnaryov, Alexander; Shulga, Vladimir; Ventskovsky, Oleg (2016-10-01). "Yuzhnoye's new liquid rocket engines as enablers for space exploration". Acta Astronautica. 127: 693–698. Bibcode:2016AcAau.127..693D. doi:10.1016/j.actaastro.2016.04.006.
- ^ "RD-843". Defense Industry Of Ukraine Products And Services. Retrieved 2016-07-11.
- ^ "Vega". 4 June 2020.
- ^ "Vega C Users Manual" (PDF). Arianespace. May 2018. p. 1-6. Retrieved 2024-07-08.
External links
edit- Yuzhnoye Design Bureau English-language home page Archived 2021-06-29 at the Wayback Machine
- Yuzhmash Home Page
- Vega's User Manual
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