LE-5B-3
The longer-life, higher-efficiency LE-5B derivative serving as H3's second-stage engine.
Identity
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- LE-5B-3
- Status
- active
Details
- Description
- The longer-life, higher-efficiency LE-5B derivative serving as H3's second-stage engine.
- Family
- Lineage
- Note
- JAXA documents LE-5B-3 as an H3-focused design evolution of LE-5B-2.
- Related Propulsion System
- Relationship
- direct-derivative-of
- Sources
- Nested value
- Nested value
- Propellants
- liquid hydrogenliquid oxygen
- Rocket Specs
- Cycle
- expander-bleed
- Restartable
- Yes
- Vacuum Specific Impulse S
- 448
- Vacuum Thrust Kn
- 137
Links
- Official Url
- https://www.rocket.jaxa.jp/rocket/h3/le5b.html
Assets & Meta
- Creation Time
- July 29, 2026 at 08:49:17 UTC
- Updated Time
- July 29, 2026 at 08:50:34 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
- H3-30S official vehicle reference
- Accessed Date
- 2026-07-29
- Publisher
- Japan Aerospace Exploration Agency
- Title
- H3 Launch Vehicle: LE-5B-3 and LE-9
- Accessed Date
- 2026-07-29
- Publisher
- Japan Aerospace Exploration Agency
- Title
- LE-5B-3