H-I

H-I

H-I rocket
Function	Carrier rocket
Manufacturer	McDonnell Douglas (design) Mitsubishi Heavy Industries (production)
Country of origin	Japan (production)  United States (design)
Size
Height	42 metres (138 ft)
Diameter	2.44 metres (8.0 ft)
Mass	142,260 kilograms (313,630 lb)
Stages	2 or 3
Capacity
Payload to LEO	3,200 kilograms (7,100 lb)
Payload to GTO	1,100 kilograms (2,400 lb)
Associated rockets
Family	Thor
Comparable	Delta 3000, PSLV
Launch history
Status	Retired
Launch sites	LA-N, Tanegashima
Total launches	9
Successes	9
First flight	12 August 1986
Last flight	11 February 1992
Boosters - Castor 2
No. boosters	6 or 9
Engines	1 TX-354-3
Thrust	258.9 kilonewtons (58,200 lbf)
Specific impulse	262 sec
Burn time	37 seconds
Fuel	Solid
First stage - Thor-ELT
Engines	1 MB-3-3
Thrust	866.7 kilonewtons (194,800 lbf)
Specific impulse	290 sec
Burn time	270 seconds
Fuel	RP-1/LOX
Second stage
Engines	1 LE-5
Thrust	102.9 kilonewtons (23,100 lbf)
Specific impulse	450 sec
Burn time	370 seconds
Fuel	LH2/LOX
Third stage (optional)
Engines	1 UM-129A
Thrust	77.4 kilonewtons (17,400 lbf)
Specific impulse	291 sec
Burn time	68 seconds
Fuel	Solid

The 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–2, 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. On launches to Geosynchronous transfer orbits, a Nissan–built 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 were used as booster rockets.

The American Thor-ELT was used for the H-I.

Launch history

When the H–1 was announced in 1986, company representative Tsuguo Tatakawe clarified that it would only be used to launch indigenous (i.e. Japanese) payloads, that only two launches per year could be mounted, and that the launch window consisted of a four-month period in which Japanese fishing fleets were not active (the falling launch boosters may damage fishing nets in the ocean waters).^[1]

See also

• Delta rocket
• H-II
• H-IIA
• PGM-17 Thor
• Comparison of orbital launchers families
• Comparison of orbital launch systems

References

• Wade, Mark. "Delta". Encyclopedia Astronautica. Retrieved 31 August 2008. 
• McDowell, Jonathan. "Thor". Orbital and Suborbital Launch Database. Jonathan's Space Report. Retrieved 31 August 2008. 
• Krebs, Gunter. "H-1". Gunter's Space Page. Retrieved 31 August 2008. 

Mitsubishi Heavy Industries
Mitsubishi
Subsidiaries	Mitsubishi Aircraft Corporation (90%) Mitsubishi Caterpillar Forklifts Mitsubishi Caterpillar Forklift America Mitsubishi Caterpillar Forklift Europe Mitsubishi FBR Systems Mitsubishi Power Systems Europe
Joint ventures	Current Atmea Japanese Aero Engine Corporation Launch Services Alliance Defunct Nihon Aircraft Manufacturing Corporation
Products	Aircraft ATD-X F-1 F-2 F-15J H-60 MH2000 Mitsubishi Regional Jet T-2 Armored vehicles Type 10 Type 61 Type 74 Nana-yon Type 89 IFV Type 90 Kyū-maru Launch vehicles N-I N-II H-I H-II H-IIA H-IIB H3 Missiles Type 88 Type 89 Type 90 Type 91 Ships Akizuki class Atago class Hatakaze class Kongō class Takanami class Submarines Harushio class Oyashio class Sōryū class Other Crystal Mover Green Mover Max MEISTeR Mitsubishi APWR Wakamaru
People	Kazuo Tsukuda
Other	Mitsubishi Dynaboars
Products currently in development shown in italics Category

Thor and Delta rockets
PGM-17 Thor Thor family Delta family
Rockets	Thor Thor Thor-Able Thor-Ablestar Thor-Agena Thor-Burner Thor-Delta Thor DSV-2 Thor DSV-2U Thorad-Agena Delta Alphabetical Delta A Delta B Delta C Delta D Delta E Delta F Delta G Delta J Delta L Delta M Delta N Numerical Delta 0100 Delta 1000 Delta 2000 Delta 3000 Delta 4000 Delta 5000 Delta 6000 Delta 7000 Delta 8000 Delta 9000 Modern Delta II Delta III Delta IV Export N-I N-II H-I
Launch sites	Canaveral (S)LC-17 LC-18B SLC-37B Johnston LE-1 LE-2 Tanegashima Osaki Vandenberg SLC-1 SLC-2 SLC-3 SLC-6 SLC-10 Bases Bardney Breighton Caistor Carnaby Catfoss Coleby Grange Driffield Feltwell Folkingham Full Sutton Harrington Hemswell Ludford Magna Melton Mowbray Mepal North Luffenham North Pickenham Polebrook Shepherds Grove Tuddenham
Components	Boosters Castor-1 Castor-1 Castor-4 Castor-4A CBC GEM-40 GEM-46 GEM-60 First stages Common Booster Core Upper Stages Delta Delta-A Delta-D Delta-E Delta-F Delta-K Delta-P DCSS Other Able Ablestar Agena Altair Burner FW-4D IABS PAM-D Star UM-129 Engines AJ10 B-8048 B-8081 B-8096 LE-5 LR-79 R-4D RL10 RS-27 RS-68 TR-201
Manufacturers	Rocket Douglas McDonnell Douglas Boeing United Launch Alliance Engines Aerojet Alliant Rocketdyne Thiokol TRW
Launches	1957–1959 1960–1969 1970–1979 1980–1989 1990–1999 2000–2009 2010–2019