| Country of origin | Ukraine |
|---|---|
| First flight | 2012-02-13 |
| Designer | Yuzhnoye Design Bureau |
| Manufacturer | Yuzhmash |
| Application | Upper stage |
| Associated LV | Vega |
| 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 newtons (551 lbf) |
| Chamber pressure | 2.04 MPa (296 psi) |
| Specific impulse, vacuum | 315.5 seconds |
| Burn time | Up to 667s |
| Dimensions | |
| Dry mass | 15.93 kilograms (35.1 lb) |
| Used in | |
| AVUM | |
| References | |
| References | [1][2][3][4] |
The RD-843 is a Ukrainian single nozzle liquid propellant rocket engine burning pressure-fed UDMH and nitrogen tetroxide. It is rated for up to 5 restarts, and can gimbal up to 10 degrees in each direction.[2]
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 Satan 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 8201 s, which is approximately 12 service lives on 4 engines. As of June 2020 it has been successfully used on 14 orbital launches.[5]
It is currently used as the main engine of Vega's AVUM upper stage.
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