This feels like the japanese "Flight 501", this is terrible, hopefully MMX will be able to launch for its 2024 window.The odd SS-520 aside, Japan usually had luck with maiden launches for the past half-century.The upper stage does not seem to be really the same as before, it has a larger diameter than the HII familly's and a whole new version of the LE-5B engine that never flew before.
Major yikes. I guess I didn't quite realize that Japan put a satellite valued at more than a quarter of a billion dollars on the debut flight of the H3 rocket. That's pretty damn bold.
Looks like JAXA & gov.’s rationale of putting an $280m major Earth observation mission on a (in @NASA_LSP’s terms) “uncertified” launch vehicle is getting a lot of backlashes, even ex-astronaut Soichi Noguchi is questioning it now:
#H3ロケット失敗 is hit, but #JAXA let's do our best. In the first place, why is it necessary to put a practical satellite on the test machine? The first H2A after the destruction of H28 was a dummy satellite. H3 5 billion #だいち3号 38 billion, so it's a risk hedge. Next time, why don't you slowly investigate the cause so as not to put pressure on Mr. Okada and make it "Karauchi"?
Quote from: TheKutKu on 03/07/2023 02:46 pmThis feels like the japanese "Flight 501", this is terrible, hopefully MMX will be able to launch for its 2024 window.The odd SS-520 aside, Japan usually had luck with maiden launches for the past half-century.The upper stage does not seem to be really the same as before, it has a larger diameter than the HII familly's and a whole new version of the LE-5B engine that never flew before.I think it was more likely to japanese "Flight V63", in which the cryogenic HM7B rocket engine aboard Ariane 4 also failed to ignite. "Flight 501" would be more related if H3 failure was caused by a software bug.
Not to invite undue speculation, but very shortly after SRB separation, it appeared that the vehicle began to tumble.Did anyone catch that? As it has two new engines, a thrust-vector issue might be a problem.
Additional investigation updates have been given out today. Key points (as much as I could pick out) below:[…]
Quote from: Galactic Penguin SST on 04/27/2023 09:18 amAdditional investigation updates have been given out today. Key points (as much as I could pick out) below:[…]"misearthing" = grounding?
機体電気系統含めた変更点 H3ロケットでは第2段の制御系を冗長構成（A系/B系）にしている。 H-IIAロケットは機器はシングル構成であるが、機器間のラインを冗長にしている。電力分配器（PDB2）に下流機器の電圧・電流の異常検知機能はない。
Changes including aircraft electrical system In the H3 launch vehicle, the second stage control system has a redundant configuration (system A/system B). The H-IIA launch vehicle has a single configuration, but the lines between the devices are redundant. power distributor(PDB2) does not have a function to detect anomalies in the voltage and current of downstream equipment.
