H-I Launch Vehicle
H-I was Japan's transitional launch vehicle between the licensed Delta-derived N series and the fully domestically developed H-II. It retained N-II's first stage and strap-on boosters while introducing Japan's LE-5 liquid-hydrogen second stage, a domestic solid third stage, and domestic inertial guidance; all nine launches succeeded from 1986 through 1992.
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Identity
- Aliases
- H-1H IH-Iロケット
- Family Name
- H-I
- Full Name
- H-I Launch Vehicle
- Status
- retired
- Type
- rocket
Details
- Description
- H-I was Japan's transitional launch vehicle between the licensed Delta-derived N series and the fully domestically developed H-II. It retained N-II's first stage and strap-on boosters while introducing Japan's LE-5 liquid-hydrogen second stage, a domestic solid third stage, and domestic inertial guidance; all nine launches succeeded from 1986 through 1992.
- Dimensions
- Diameter M
- 2.49
- Height M
- 40.3
- First Flight Year
- 1,986
- Last Flight Year
- 1,992
- Manufacturer
- Parent Vehicle Family
- Propulsion Configurations
- Entries
- Nested value
- Rocket Specs
- Liftoff Mass Kg
- 139,300
- Reusability
- expendable
- Stages Count
- 3
Links
Assets & Meta
- Creation Time
- July 13, 2026 at 12:18:05 UTC
- Updated Time
- July 29, 2026 at 15:38:10 UTC
- Image
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Other
- Search Name
- H-I Launch Vehicle H-1 H I H-Iロケット