H-I
Country of Origin: Japan/US
Manufacturer: Mitsubishi Heavy Industries/McDonnell Douglas
Height: 42 m
Diameter: 2.44 m
Payload to LEO: 3.2 tons
Total Mass: 142.26 tons
Launch Sites: Tanegashima
First Flight: August 12, 1986
Last Flight: February 11, 1992
Total Launches: 9
Successful Launches: 9
| Stage | Diameter | Fuel | Engine | Time | Thrust (Vac.) | ISP (SL / Vac.) | Mass / Empty Mass |
|---|---|---|---|---|---|---|---|
| Boosters (Castor 2) | 0.79 m | Solid | 6 or 9 TX-354-3 | 37 s | 6 or 9 x 259 kN | ? / 262 s | |
| 1 (Thor-ELT) | 2.44 m | RP-1 / LOX | MB-3-3 | 270 s | 866.7 kN | 290 s / ? | |
| 2 | 2.44 m | LH2 / LO2 | LE-5 | 370 s | 102.9 kN | ? / 450 s | |
| 3 (opt.) | 2.44 m | Solid | UM-129A | 68 s | 77.4 kN | ? / 291 s |
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