HM7B
Retired HM7B cryogenic upper-stage engine variant. ESA identifies HM7B as the Ariane 4 third-stage engine reused on Ariane 5 ECA's ESC-A upper stage; it operated for nearly 940 seconds and delivered 6.5 tonnes (about 63.7 kN) of vacuum thrust.
Identity
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- HM7B
- Status
- retired
Details
- Description
- Retired HM7B cryogenic upper-stage engine variant. ESA identifies HM7B as the Ariane 4 third-stage engine reused on Ariane 5 ECA's ESC-A upper stage; it operated for nearly 940 seconds and delivered 6.5 tonnes (about 63.7 kN) of vacuum thrust.
- Family
- Propellants
- liquid hydrogenliquid oxygen
- Rocket Specs
- Burn Time S
- 940
- Cycle
- gas generator
- Vacuum Specific Impulse S
- 446
- Vacuum Thrust Kn
- 63.7
Links
Assets & Meta
- Creation Time
- July 29, 2026 at 08:40:58 UTC
- Updated Time
- August 15, 2026 at 08:09:20 UTC
Other
- Sources
- Accessed Date
- 2026-07-29
- Note
- ESA identifies HM7B as the Ariane 4 third-stage engine reused on Ariane 5 ECA's ESC-A and reports nearly 940 seconds operation with 6.5 tonnes of vacuum thrust.
- Publisher
- European Space Agency
- Title
- Ariane 5 ECA
- Accessed Date
- 2026-08-15
- Note
- ArianeGroup's HM7B brochure identifies the gas-generator cycle, 64.8 kN vacuum thrust, 446 s specific impulse, LOX/LH2 propellants, and more than 130 consecutive Ariane 5 ECA flights.
- Publisher
- ArianeGroup
- Title
- HM7B engine
- Accessed Date
- 2026-07-29
- Publisher
- European Space Agency
- Title
- Ariane launch log 1996 to 2023