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.
Identity
- Aliases
- H-1H IH-Iロケット
- Family Name
- H-I
- Full Name
- H-I Launch Vehicle
- Reusability
- expendable
- Slug
- 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.
- Diameter M
- 2.49
- Engines
- Count
- 1
- Name
- LE-5
- Placement
- upper
- First Flight Year
- 1,986
- Height M
- 40.3
- Last Flight Year
- 1,992
- Liftoff Mass Kg
- 139,300
- Manufacturer Id
- jd78f0qx6y0pykq0j05qvmz7qn7kpnbp
- Parent Vehicle Family Id
- nd7wq1dt82tpjsz86g3w6x7fad8aeq7w
- Stages Count
- 3
Links
Assets & Meta
- Creation Time
- 7/13/2026, 12:18:05 PM
- Updated Time
- 7/13/2026, 12:18:05 PM