Also known as H–1
The H–I (H–1) was a Japanese medium-lift launch vehicle, consisting of a licence-produced American first stage and set of booster rockets, and all-Japanese upper stages. The H in the name represented the use of liquid hydrogen fuel in the second stage. It was launched nine times between 1986 and 1992. It replaced the N-II, and was subsequently replaced by the H-II, which used the same upper stages with a Japanese first stage.
Key facts
- Rocket.image
- H-I.svg
- Rocket.upright
- 0.25
- Rocket.caption
- H-I rocket
- Rocket.function
- Medium-lift launch vehicle
- Rocket.stages
- 2 or 3
- Rocket.family
- Delta
- Rocket.derived_from
- N-II
- Rocket.derivatives
- H-II
- Rocket.comparable
- Delta 3000, PSLV
- Rocket.status
- Retired
- Rocket.sites
- Tanegashima, Osaki
- Rocket.launches
- 9
- Rocket.success
- 9
- Rocket.first
- 12 August 1986
- Rocket.last
- 11 February 1992
- Rocket/Payload.location
- GTO
- Rocket/Stage.type
- stage
- Rocket/Stage.solid
- yes
via Wikipedia infobox
Wikidata facts
- Image
- H-I-FullScaledModel-20090827.jpg
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- Commons category
- H-I
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Article
3 sectionsContents
- Launch history
- See also
- References
The H–I (H–1) was a Japanese medium-lift launch vehicle, consisting of a licence-produced American first stage and set of booster rockets, and all-Japanese upper stages. The H in the name represented the use of liquid hydrogen fuel in the second stage. It was launched nine times between 1986 and 1992. It replaced the N-II, and was subsequently replaced by the H-II, which used the same upper stages with a Japanese first stage.
The first stage of the H–I was a licence-built version of the Thor-ELT, which was originally constructed for the US Delta 1000 rocket. The stage had already been produced under licence in Japan for the N-I and N-II rockets. The second stage was entirely Japanese, using an LE-5 engine, the first rocket engine in Japan to use a cryogenic fuel. On launches to Geosynchronous transfer orbits, a Nissan–built UM-69A solid motor was used as a third stage. Depending on the mass of the payload, either six or nine US Castor 2 SRMs were used as booster rockets.