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The HM4 was a first non-American cryogenic rocket engine.[dubious – discuss] 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.
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engine hm7 developed used technologies cryogenic france testbed never flew ariane kn lbf first rocket 1967 1969 new société d'etudes
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| HM4 | Application | Cryogenic Engine Testbed | 1.00 | infobox |
| HM4 | Chamber | 4 | 1.00 | infobox |
| HM4 | Chamber pressure | 24kg/cm2 | 1.00 | infobox |
| HM4 | Country of origin | France | 1.00 | infobox |
| HM4 | Cycle | Gas-generator | 1.00 | infobox |
| HM4 | Designer | Société d'Etudes pour la Propulsion par Réaction | 1.00 | infobox |
| HM4 | Dry mass | 198 kg (437 lb) | 1.00 | infobox |
| HM4 | Mixture ratio | 5:1 | 1.00 | infobox |
| HM4 | Notes | Testbed engine, never flew | 1.00 | infobox |
| HM4 | Propellant | LOX / .mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-a… | 1.00 | infobox |
| HM4 | Specific impulse, vacuum | 412 s (4.04 km/s) | 1.00 | infobox |
| HM4 | Status | Retired | 1.00 | infobox |
| HM4 | Successor | HM7 | 1.00 | infobox |
| HM4 | Thrust | 40 kN (8,992 lbf) | 1.00 | infobox |
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