LE-5B
The LE-5A-derived upper-stage engine used on H-IIA before the LE-5B-2 design update.
Identity
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- LE-5B
- Status
- retired
Details
- Description
- The LE-5A-derived upper-stage engine used on H-IIA before the LE-5B-2 design update.
- Family
- Lineage
- Note
- JAXA explicitly describes LE-5B as an improved LE-5A.
- Related Propulsion System
- Relationship
- direct-derivative-of
- Sources
- Nested value
- Propellants
- liquid hydrogenliquid oxygen
- Rocket Specs
- Cycle
- expander-bleed
- Restartable
- Yes
- Vacuum Specific Impulse S
- 448
- Vacuum Thrust Kn
- 137
Links
Assets & Meta
- Creation Time
- July 29, 2026 at 08:48:39 UTC
- Updated Time
- July 29, 2026 at 08:50:29 UTC
Other
- Sources
- Accessed Date
- 2026-07-29
- Note
- Supports the legacy vehicle installation and the narrow canonical identity used for migration.
- Publisher
- Official vehicle or program source
- Title
- H-IIA Launch Vehicle official vehicle reference
- Accessed Date
- 2026-07-29
- Publisher
- Japan Aerospace Exploration Agency
- Title
- July 2025 President's Press Conference: H-IIA Flight 50
- Accessed Date
- 2026-07-29
- Publisher
- Japan Aerospace Exploration Agency
- Title
- LE-5B