BREMEN, Germany—Verification of the LE-9 main engine of Japan’s forthcoming H3 space launcher will move into so-called battleship testing in December, mated with propellant tanks to prove the integrated propulsion system. The Japan Aerospace Exploration Agency (JAXA) and prime contractor Mitsubishi Heavy Industries (MHI) are meanwhile preparing to test a slightly revised design incorporating cheaper, printed parts. The H3 program is on schedule, said JAXA Associate Senior ...


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