HM4
The HM4 was a first non-American cryogenic rocket engine. Developed in France between 1967 and 1969 it never flew into space, was used purely as a testbed for new technologies. Technologies developed in HM4 become a base for HM7 engine used in Ariane.
| Country of origin | France |
|---|---|
| Designer | Société d'Etudes pour la Propulsion par Réaction |
| Application | Cryogenic Engine Testbed |
| Associated LV | CNES |
| Successor | HM7 |
| Status | Retired |
| Liquid-fuel engine | |
| Propellant | Liquid oxygen / Liquid hydrogen |
| Mixture ratio | 5.0 |
| Cycle | Gas-generator |
| Configuration | |
| Chamber | 4 |
| Performance | |
| Thrust | 40 kN (8,992 lbf) |
| Chamber pressure | 24kg/cm2 |
| Specific impulse, vacuum | 412 s (4.04 km/s) |
| Dimensions | |
| Dry weight | 198 kg |
| References | |
| Notes | Testbed engine, never flew |
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