HM-7
HM-7 is the original liquid-oxygen/liquid-hydrogen third-stage engine of Ariane 1 and the early member of the HM7 engine family. It first flew with Ariane 1 on 24 December 1979 from Kourou. The cryogenic stage supplied the final propulsion after the two storable-propellant Viking-powered stages. HM7B represents the later engine development used on subsequent Ariane upper stages.
Identity
- Aliases
- HM7HM-7 engine
- Domains
- spaceflight
- Identity Level
- model
- Kind
- liquid-rocket-engine
- Name
- HM-7
- Status
- retired
Details
- Description
- HM-7 is the original liquid-oxygen/liquid-hydrogen third-stage engine of Ariane 1 and the early member of the HM7 engine family. It first flew with Ariane 1 on 24 December 1979 from Kourou. The cryogenic stage supplied the final propulsion after the two storable-propellant Viking-powered stages. HM7B represents the later engine development used on subsequent Ariane upper stages.
- Family
- First Flight Date
- 1979-12-24
- Propellants
- LOXLH2
Links
Assets & Meta
- Creation Time
- August 13, 2026 at 22:55:30 UTC
- Updated Time
- October 29, 2026 at 15:36:03 UTC
Other
- Sources
- Note
- ESA identifies Ariane 1 as powered by four Viking 5 engines, one Viking 4 engine, and a cryogenic LOX/LH2 HM-7 engine on stage 3.
- Publisher
- European Space Agency
- Title
- Meteosat Achievements / Ariane Launcher Characteristics
- Note
- ESA history identifies HM-7 as the cryogenic upper-stage engine family used in early Ariane launchers.
- Publisher
- European Space Agency
- Title
- A History of the European Space Agency
- Accessed Date
- 2026-08-15
- Note
- ESA records Ariane 1's successful maiden flight on 24 December 1979; HM-7 powered the third stage of the Ariane 1 core.
- Publisher
- European Space Agency
- Title
- History: Ariane L01, 1979
- Accessed Date
- 2026-10-29
- Note
- ESA dates Ariane 1’s successful inaugural launch to 24 December 1979.
- Publisher
- European Space Agency
- Title
- History: Ariane L01, 1979