H-I

Infobox Rocket

---

caption = The H-I rocket
imsize = 75
function = Carrier rocket
manufacturer = Mitsubishi
country-origin = JPN
height = convert|42|m|ft
diameter = convert|2.44|m|ft
mass = convert|142260|kg|lb
stages = 2 or 3
capacities = Infobox Rocket/Payload
location = LEO
kilos = convert|3200|kg|lbInfobox Rocket/Payload
location = GTO
kilos = convert|1100|kg|lb
family = Thor
comparable = Delta
status = Retired
derivatives = H-II, H-IIA
sites = LA-N, Tanegashima
launches = 9
success = 9
first = 12 August 1986
last = 11 February 1992

stagedata = Infobox Rocket/Stage
type = booster
name = Castor 2
number = 6 or 9
engines = 1 TX-354-3
thrust = convert|258.9|kN|lbf
SI = 262 sec
burntime = 37 seconds
fuel = SolidInfobox Rocket/Stage
type = stage
stageno = First
name = Thor-ELT
engines = 1 MB-3-3
thrust = convert|866.7|kN|lbf
SI = 290 sec
burntime = 270 seconds
fuel = RP-1/LOXInfobox Rocket/Stage
type = stage
stageno = Second
engines = 1 LE-5
thrust = convert|102.9|kN|lbf
SI = 450 sec
burntime = 370 seconds
fuel = LH2/LOXInfobox Rocket/Stage
type = stage
stageno = Third
diff = optional
engines = 1 UM-129A
thrust = convert|77.4|kN|lbf
SI = 291 sec
burntime = 68 seconds
fuel = SolidThe H-I or H-1 was a Japanese liquid-fuelled carrier rocket, consisting of a licence-produced American first stage and set of booster rockets, and all-Japanese upper stages. 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 licence produced in Japan for the N-I and N-II rockets. The second stage was entirely Japanese, using an LE-5 engine. On launches to Geosynchronous transfer orbits, a Nissan-produced UM-129A solid motor was used as a third stage. Depending on the mass of the payload, either six or nine US Castor 2 SRMs would be used as booster rockets.

Launch history

ee also

*Delta rocket
*H-II
*H-IIA
*PGM-17 Thor

References

*cite web|url=http://www.astronautix.com/lvs/delta.htm|title=Delta|first=Mark|last=Wade|publisher=Encyclopedia Astronautica|accessdate=2008-08-31
*cite web|url=http://planet4589.org/space/lvdb/launch/Thor|title=Thor|first=Jonathan|last=McDowell|work=Orbital and Suborbital Launch Database|publisher=Jonathan's Space Report|accessdate=2008-08-31
*cite web|url=http://space.skyrocket.de/index_frame.htm?http://space.skyrocket.de/doc_lau/h-1.htm|title=H-1|first=Gunter|last=Krebs|publisher=Gunter's Space Page|accessdate=2008-08-31