JAXA Begins Tests of H-III Engines

H-III launch vehicle variants (Credit: JAXA)

The Nikkei Asian Review reports JAXA began test firings of the LE-9 rocket engine, which will power its new H-III launch vehicle. The first round of testing will include 11 firings through June.

The new booster is set to replace the H-IIA and H-IIB launchers, which are the mainstay of Japan’s orbital rocket fleet. Mitsubishi Heavy Industries and IHI are leading the development of the new two-stage launch vehicle.

H-III is designed to launch payloads at lower costs. The basic configuration can carry 4 metric tons into sun synchronous orbit.  By adding two to four strap-on boosters to the first stage, H-III will be able to lift up to 6.5 metric tons into geostationary transfer orbit.

The new booster will have a base cost of about 5 billion yen ($43.9 million). The H-IIA costs an estimated 10 billion yen ($87.8), with the more powerful H-IIB costing 10 billion yen ($131.5 million).

JAXA’s goal is for the H-III to complete flight tests and enter service in March 2021.