HM7B
The HM7B was a European cryogenic upper stage rocket engine used on the vehicles in the Ariane rocket family. It will be replaced by Vinci, which will act as the new upper stage engine on Ariane 6. Nearly 300 engines have been produced to date.
| Country of origin | France |
|---|---|
| First flight | 24 December 1979 |
| Designer | Snecma |
| Manufacturer | Snecma |
| Application | Upper stage engine |
| Associated LV | ESA |
| Predecessor | HM4 |
| Successor | Vinci |
| Status | Retired |
| Liquid-fuel engine | |
| Propellant | Liquid oxygen / Liquid hydrogen |
| Mixture ratio | 5.0 |
| Cycle | Gas-generator |
| Configuration | |
| Chamber | 1 |
| Nozzle ratio | 83.1 |
| Performance | |
| Thrust, vacuum | 62.2 kN (13,980 lbf) |
| Chamber pressure | 3.7 MPa (37 bar) |
| Specific impulse, vacuum | 4.36 km/s (444.6 s) |
| Dimensions | |
| Length | 2.01 m |
| Diameter | 0.992 m |
| Dry weight | 165 kg |
| Used in | |
| References | |
| References | |
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