H-II B

About the H-II B

The H-II B is an expendable launch vehicle that is designed to launch the H-II Transfer Vehicle (HTV) to deliver supplies to the ISS. H-II B rockets are liquid-fueled rockets with solid-fuel strap on boosters (SRB-A3) and launch from Tanegashima Space Center, Japan. Mitsubishi and JAXA are the main contributors to the design, construction, and operation of the H-II B rockets. The first flight was in September 2009 and had flown a total of seven times through 2019.

The H-II B has two stages, four strap on boosters, and a fairing. The First stage has a height of 38 m (125 ft) and a diameter of 5.2 m (17 ft). This is the core booster of the rocket, it does a significant amount of the work putting the payload into orbit. The four strap on boosters uses solid propellant instead of liquid propellant. The SRB-A3 has a hight of 15 m (49 ft) and a diameter of 2.5 m (8 ft 2 in). The boosters help the rocket get off the pad. The second stage has a hight of 11 m (36 ft) and a diameter of 4.0 m (13.1 ft). This is the last and final stage of the rocket. Once all the propellant in the second stage is replenished then the payload (HTV) is deployed and heads to the ISS.

~wikipedia

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