Ten years in the making, Japan’s H3 rocket is finally ready to fly, with its inaugural launch scheduled for Tuesday, February 14.
The rocket was supposed to fly in 2020, but serious technical problems with the new LE-9 first-stage, first detected during qualifications testing in May 2020, included cracked turbine blades in the LE-9’s turbopump assembly and a hole seared into its combustion chamber wall. As a result, JAXA bumped the launch from 2020 to spring 2021, but ongoing problems forced yet another delay, this time to early 2023.
H3 is a two-stage fully liquid propellant launch vehicle with a design partly inspired by its predecessors, H-IIA and H-IIB, and also Japan’s Epsilon rocket. The first stage will feature either two or three LE-9 engines, while the upper stage gets a single engine. The rocket’s strap-on solid rocket boosters are very similar to the Epsilon first stage.
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