H-2B (original) (raw)
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H-2B (HTV 3) [JAXA]
The H-2B rocket is an more powerful development based on the H-2A rocket to launch the HTV (Kounotori) cargo vessels to the ISS.
The H-2B launch vehicle is a LOX/LH2 fueled two-stage rocket, as the H-2A, but has a first-stage body of 5.2 m in diameter compared with 4 m for the H-2A and features two instead of one LE-7B main engines. The H-2B first stage holds 70% more propellant than that of the H-2A. The first stage is augmented by four SRB-A3 strap-on solid rocket boosters. The second stage is the same as used in the H-2A and is powered by a single LE-5B engine.
As payload fairing, a stretched version of the H-2A's 5 m payload fairing is available.
→ all launches of H-2 family vehicles
| Version | Strap-On | Stage 1 | Stage 2 |
|---|---|---|---|
| H-2B-304 | 4 × SRB-A | Widebody / 2 LE-7A | LE-5B |
| H-2B-304A ** | 4 × SRB-A | Widebody / 2 × LE-7A | Widebody / LE-5B |
* = suborbital
** = under study
| Performance (kg) | LEO | LPEO | SSO | GTO | GEO | MolO | IP |
|---|---|---|---|---|---|---|---|
| H-2B-304 | 16500 | 8000 | |||||
| H-2B-304A | 10000 |