N-II
Country of Origin: Japan/United States
Manufacturer: Mitsubishi Heavy Industries
Height: 35 m
Diameter: 2.44 m
Payload to LEO: 2000 kg
Total Mass: 132.69 tons
Launch Sites: Tanegashima
First Flight: February 11, 1981
Last Flight: February 19, 1987
Total Launches: 8
Successful Launches: 8
N-II
| Stage | Diameter | Fuel | Engine | Time | Thrust (Vac.) | ISP (SL / Vac.) | Mass / Empty Mass |
|---|---|---|---|---|---|---|---|
| Boosters (Castor 2) | 0.79 m | Solid | 9 x TX-354-3 | 37 s | 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 (Delta-F) | UDMH / Nitric Acid | AJ-10-118F | 335 s | 41.3 kN | ? / 280 s | ||
| 3 (Star-37E) (opt.) | Solid | 42 s | 68 kN | ? / 284 s | |||
| 3 (Burner-2) (opt.) | Solid | 42 | 43.6 kN | ? / 285 s |
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