Watch the video at 1:03:32 on. The lower stage separates then you see engine(s) fire up and gimballing then within seconds stop firing but you can still see gimballing going on. I'm not saying there wasn't a problem with the first stage I'm saying both stages had problems.
Quote from: Phillip Clark on 07/02/2017 09:56 pmQuote from: jcm on 07/02/2017 09:21 pmQuote from: Danderman on 07/02/2017 05:04 pmSince stage separation reportedly did occur, the stack should have flown very far downrange. Did the third stage fire?There is no way the 3rd stage would fire this early in the mission. Stage 2 was meant to enter parking orbit and thenreignite to GTO; stage 3 increases GTO apogee after that, with its first burn at T+31 minutes.Have I missed something? I thought that it was two core stages plus four strap-ons - no third stage, unless you call the strap-ons alone stage 1.Long March 5 has an optional third stage called YZ-2, using hypergolic propellants. This had already been used in the first launch (and came in quite handy, as it could compensate for a performance shortfall of the second stage) https://en.wikipedia.org/wiki/Long_March_5
Quote from: jcm on 07/02/2017 09:21 pmQuote from: Danderman on 07/02/2017 05:04 pmSince stage separation reportedly did occur, the stack should have flown very far downrange. Did the third stage fire?There is no way the 3rd stage would fire this early in the mission. Stage 2 was meant to enter parking orbit and thenreignite to GTO; stage 3 increases GTO apogee after that, with its first burn at T+31 minutes.Have I missed something? I thought that it was two core stages plus four strap-ons - no third stage, unless you call the strap-ons alone stage 1.
Quote from: Danderman on 07/02/2017 05:04 pmSince stage separation reportedly did occur, the stack should have flown very far downrange. Did the third stage fire?There is no way the 3rd stage would fire this early in the mission. Stage 2 was meant to enter parking orbit and thenreignite to GTO; stage 3 increases GTO apogee after that, with its first burn at T+31 minutes.
Since stage separation reportedly did occur, the stack should have flown very far downrange. Did the third stage fire?
Wouldn't there be an engine management function that would shut down the engine experiencing the problem but have the good engine continue burning longer to make up the shortfall ??...why wasn't the mission saved with a longer S1 one engine burn and a successful S2 burn ??
This is unfortunate...This is probably not related to the failure (it seems), but if you look at this video there seems to be some material dangling loose at the base of at least two boosters. It is most clearly seen around 7:07 of the video. Is that normal? And if not, is it metal pieces or some sort of insulation fabric? And could it have swung and and damaged one of the core engines?(attached image below, but watch the video, it is more obvious there)
It is easy to forget that, despite it size, increasingly cosmopolitan people and economic power, China is not a free society and, in times of great official embarrassment, will not even pretend to be.It is obvious that this launch failure has metamorphosed into a serious political embarrassment for someone with power and we can officially expect to not hear anything else from official Chinese sources. It will be harder for the Chinese to pretend that the launch never happened as it once was. I suspect that the most we will hear after this is rumblings from anonymous CSA sources of 'foreign-funded saboteurs'.
Quote from: Ben the Space Brit on 07/03/2017 01:17 pmIt is easy to forget that, despite it size, increasingly cosmopolitan people and economic power, China is not a free society and, in times of great official embarrassment, will not even pretend to be.It is obvious that this launch failure has metamorphosed into a serious political embarrassment for someone with power and we can officially expect to not hear anything else from official Chinese sources. It will be harder for the Chinese to pretend that the launch never happened as it once was. I suspect that the most we will hear after this is rumblings from anonymous CSA sources of 'foreign-funded saboteurs'.Yes, I agree that it was quite the embarrassment - especially that the launch was streamed live and people saw what went wrong in real time.I am afraid that Chinese bureaucrats will now make the missions even less public and live streams will become even rarer.
What is strange is that the flow is heading towards the front - I can't think of why (exosphere atmospheric effect?).
I wonder if the second stage and its payload impacted somewhere east of Manlia in the PI?
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Quote from: Grandpa to Two on 07/03/2017 04:57 amWatch the video at 1:03:32 on. The lower stage separates then you see engine(s) fire up and gimballing then within seconds stop firing but you can still see gimballing going on. I'm not saying there wasn't a problem with the first stage I'm saying both stages had problems.The upper stage might have issues as well, but the first stage must contain the root cause. The upper stage does seem to shut down quickly after the first start, but that might be caused by propellant settling issues due to atmospheric friction. Later the engines do seem to start(?) - but that glow is most likely from the re-entry. (The light looks very different than the short engine start at 1:03:38)
Quote from: AnnK on 07/03/2017 06:11 pmI wonder if the second stage and its payload impacted somewhere east of Manlia in the PI?No, its trajectory was north of the Philippines, it would have to have been way off course.