The H-I, which drew on the results from the development of the N-I and N-II launch vehicles, is a three-stage rocket created for responding to Japan's satellite launching needs of the late 1980's.
The H-I's first-stage and strap-on boosters are identical to those of the N-II. The second-stage engine (LE-5) and propellant, third stage solid propellant rocket motor and inertial guidance system are all products of Japan's technology.
The H-I which was utilized in a total of 9 launches from 1986 to 1991 are no longer in use but the technology used in developing the H-I was exploited for developing the H-II.
|Diameter||2.49m (Second stage)|
|Total weight||139.3t (payload not included)|
|Guidance system||Inertial guidance system|
|Flight No.||Launch Date||Payload|
|H15F||8/13/1986||Experimental Geodetic Satellite "Ajisai"(EGS)
Magnetic Bearing Flywheel Experimental System "JINDAI"(MABES)
Japan Amateur Satellite-1 "FUJI-1"(JAS-1)
|H17F||8/27/1987||Engineering Test Satellite V "KIKU-5"(ETS-V)|
|H18F||2/19/1988||Communication Satellite-3a "Sakura-3a"(CS3a)|
|H19F||9/16/1988||Communication Satellite-3a "Sakura-3a"(CS3a)|
|H20F||9/6/1989||Geostationary Meteorological Satellite-4 "Himawari-4"(GMS-4)|
|H21F||2/7/1990||Marine Observation Satellite-1b "Momo-1b"(MOS-1b)
Deployable Boom and Umprella Test "ORIZURU"(DEBUT)
Japan Amateur Satellite-1b "FUJI-2"(JAS-1b)
|H22F||8/28/1990||Broadcasting Satellite-3a "Yuri-3a"(BS3a)|
|H23F||8/25/1991||Broadcasting Satellite-3b "Yuri-3b"(BS3b)|
|H24F||2/11/1992||Japanese Earth Resources Satellite-1 "FUYO-1"(JERS-1)|