Shulou(Shulou.com)11/24 Report--

Thanks to CTOnews.com netizen goodfull for the clue delivery! CTOnews.com, March 17 (Xinhua) Japan's new generation of main carrier rocket H3 was launched for the first time on the morning of March 7, but failed and destroyed because the two-stage booster failed to ignite, which once again lowered the low success rate in recent years. Keiko Nagaoka, Japan's minister of education, education, science and technology, said in a statement that the government had set up a working group to investigate the "very regrettable" failure.

An investigation report released by the Japan Aerospace Exploration Agency (JAXA) on March 16 said that the rocket's internal current overload before the rocket's two-stage engine was ignited, which may be the cause of the launch failure.

The report shows that:

Confirmed that the power off function of the PSC2 is working as designed. At this time, due to overcurrent on the downstream load side of the PSC2 activated during the SEIG (PNP of the stage 2 engine, etc.) for some reason, the power supply of the PSC2 is highly likely to be cut off.

Public data show that the H3 carrier rocket has a maximum diameter of 5.2m, a solar synchronous orbit (SSO) carrying capacity of more than 4 tons, and a geosynchronous transfer orbit (GTO) carrying capacity of 6.5t, and can deliver 8.8t payloads to the geosynchronous transfer orbit (GTO). The payload is about 30 per cent larger than H2A, but the launch cost is about half of it.

The H3 rocket has a maximum configuration (H3-24L) of 63 meters high and a takeoff mass of 575 tons (excluding payload). It uses a solid booster and a liquid hydrogen and liquid oxygen engine for the first and second stages. The design goal is to increase the carrying capacity and reduce the launch cost relative to the Hmura, and it is the main rocket of Japan in the future.

The LE-9 open expansion cycle liquid hydrogen liquid oxygen engine used this time is a new type of high performance rocket engine developed by Japan. It has a single vacuum thrust of 1471 KN (about 150T) and a vacuum specific impulse of 422s, which is the leading level in the world.

CTOnews.com attached this survey report original text: PDF click here to download

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