HM7 engine family
HM7 is the European cryogenic upper-stage engine family spanning the original Ariane 1 third-stage engine and the later HM7B used by subsequent Ariane launchers. Its liquid-hydrogen/liquid-oxygen propulsion contributed the final acceleration needed for high-energy satellite orbits. Ariane 5 ECA reused HM7B from Ariane 4 in its ESC-A cryogenic upper stage; Vinci powers the later Ariane 6 upper stage. Exact ratings and installation histories belong to the named HM-7 and HM7B models.
Identity
- Domains
- spaceflight
- Identity Level
- family
- Kind
- liquid-rocket-engine
- Name
- HM7 engine family
- Status
- retired
Details
- Description
- HM7 is the European cryogenic upper-stage engine family spanning the original Ariane 1 third-stage engine and the later HM7B used by subsequent Ariane launchers. Its liquid-hydrogen/liquid-oxygen propulsion contributed the final acceleration needed for high-energy satellite orbits. Ariane 5 ECA reused HM7B from Ariane 4 in its ESC-A cryogenic upper stage; Vinci powers the later Ariane 6 upper stage. Exact ratings and installation histories belong to the named HM-7 and HM7B models.
- Propellants
- liquid hydrogenliquid oxygen
Assets & Meta
- Creation Time
- July 29, 2026 at 08:40:23 UTC
- Updated Time
- October 29, 2026 at 15:36:00 UTC
Other
- Sources
- Accessed Date
- 2026-07-29
- Publisher
- European Space Agency
- Title
- Ariane 5 ECA
- Accessed Date
- 2026-07-29
- Publisher
- European Space Agency
- Title
- Ariane launch log 1996 to 2023
- Accessed Date
- 2026-10-29
- Note
- ESA historical launcher descriptions identify HM-7 on Ariane 1 and HM7B on later cryogenic stages.
- Publisher
- European Space Agency
- Title
- ESA Achievements — Ariane launcher characteristics