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Old 20th Apr 2023, 11:35
  #321 (permalink)  
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Under 2 hours to launch, SpaceX report clear for propellant load which will start in next 15 minutes.

Hopefully the stuck valve problem will not recur.
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Old 20th Apr 2023, 13:47
  #322 (permalink)  
 
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Six engines out by MaxQ by the looks of it, a brave effort but what a mountain they've set themselves to climb.
The sheer scale of this project is awe-inspiring.
Vast improvement urgently required in the trite, trivial and banal commentary and that woman's dreadful unnecessary squawk-laugh.
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Old 20th Apr 2023, 13:47
  #323 (permalink)  
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success! Although ending in a 'rapid unscheduled disassembly' ...
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Old 20th Apr 2023, 13:53
  #324 (permalink)  
 
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The NSF feed is really good. No hysterics.
Also. Crikey! 😳
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Old 20th Apr 2023, 14:02
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Originally Posted by HOVIS
The NSF feed is really good. No hysterics.
Also. Crikey! 😳
Boom..
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Old 20th Apr 2023, 14:21
  #326 (permalink)  
 
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That was really cool! Now they know what they need to work on next.
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Old 20th Apr 2023, 14:28
  #327 (permalink)  
 
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Originally Posted by IFMU
That was really cool! Now they know what they need to work on next.
working explosive bolts.
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Old 20th Apr 2023, 14:42
  #328 (permalink)  
 
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Originally Posted by Diff Tail Shim
working explosive bolts.
That is definitely one thing. I would guess that keeping all the engines running is the first thing - seems like that led to low altitude and control problems.

I thought I saw the bolts trying to fire in the video. Clearly they didn't work!
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Old 20th Apr 2023, 14:57
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Perhaps the tumble meant that the dynamics were not right for separation.
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Old 20th Apr 2023, 15:20
  #330 (permalink)  
 
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Originally Posted by Jhieminga
Perhaps the tumble meant that the dynamics were not right for separation.
That seems very possible! I am sure they will have data to look at.
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Old 20th Apr 2023, 16:50
  #331 (permalink)  
 
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real shame about the actual outcome, fingers crossed for next time..as for:

Vast improvement urgently required in the trite, trivial and banal commentary and that woman's dreadful unnecessary squawk-laugh.
I know what you mean...I turned off one feed because of the racket, went to the SpaceX feed and had to turn the sound off...

Bah Humbug - bring back commentary in the style of Jack King (that ages me) and the other old school NASA PAOs.

https://www.npr.org/sections/thetwo-...llo-dies-at-84

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Old 20th Apr 2023, 18:18
  #332 (permalink)  
 
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On further viewing in slo-mo it seems that afer MaxQ there were a series of failures in the engine bay resulting in at least one thrust-plume or combustion jet ejecting way off the axis. I'd guess they had a series of big engine failures each triggering the next with debris/shockwave until enough damage was done to compromise the control system.
They'll learn. But I reckon it'll be a while before the next attenpt as those engines are clearly not up to scratch.
Early days yet. They'll get there, of that I have little doubt.
It seems Twatter has a useful purpose after all!
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Old 20th Apr 2023, 18:35
  #333 (permalink)  
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Really interested to see the ground under the stand. They’ve done an awful lot of work but don’t think the water deluge was working for this launch and spalling may have led to the loss of some of the engines.

The good news is the site is intact and they have several more Starships and boosters - with numerous incremental improvements - ready to roll-out to the launch pad.

No prolonged stand down periods for SpaceX programmes.
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Old 20th Apr 2023, 18:40
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If the goal was to gather information, they now know what happens when it does somersaults,
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Old 20th Apr 2023, 19:02
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I find it quite incredible that anyone can be so - er - imaginative as to thinking they could see explosive bolts fire (items maybe 20=30cm long?) in a video where a thing the size of a skyscraper is only wobbly-viewed in fuzzy full-frame from end-on...
As to how one can assume failure of a 'water deluge"... Do they have one? Where are the water towers? Not visble anyway. Isn't that why the stack is fired off a raised platform? And by what physics could debris possibly manage to return into an engine against that phasmagorical maelstrom of thrust? It's not as if it's an atmospheric engine breathing ambient air full of debris is it? Any debris from spalling concrete (which one would imagine the dimmest of SpaceX engineers would have thought of...) would simply be blown into the next county.
Sorry, just no.
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Old 20th Apr 2023, 19:18
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Originally Posted by meleagertoo
I find it quite incredible that anyone can be so - er - imaginative as to thinking they could see explosive bolts fire (items maybe 20=30cm long?) in a video where a thing the size of a skyscraper is only wobbly-viewed in fuzzy full-frame from end-on...

Sorry, just no.
Perhaps it would be helpful if watched the replay, and pay attention to the video from inside the rocket, between the booster and the second stage. There were a series of flashes around the perimeter about the time the guy was talking about stage separation. It may have not been the explosive bolts but I don't believe it was imaginative or incredible.

It was cool though!
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Old 20th Apr 2023, 19:21
  #337 (permalink)  
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Who left their car in that location ?

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Old 20th Apr 2023, 21:11
  #338 (permalink)  
 
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Originally Posted by B Fraser
Who left their car in that location ?
It's possible a photographer left the car there. There is a tripod with cameras that got blown over, so perhaps the car was being used as a camera platform. It's typical rocket launch operations allow photographers to place cameras at the launch site several days ahead of the launch and being in a car would protect from rain and critters. Just not so good against fist-sized chunks of concrete. Live and learn.

In Florida they don't even allow remote control of them - devices might sit for a week with the rocket on the launch pad and have to wake up and take the photos based on what they can detect at the time. SpaceX might have similar protocols.

Alternatively this is the last time that car owner fails to tip the valet.
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Old 20th Apr 2023, 21:23
  #339 (permalink)  
 
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It appears very much like an inability to orient the rocket as desired to get to stage separation - it seemed like the control system was hunting for the correct pitch, heading, and velocity and didn't get there. Perhaps this is either an Ariane V88-like software failure, possibly a sensor issue (which one was it that the IMU acceleration sensor was installed 180 degrees out?), or whatever engines were critical to stopping the reorientation weren't operating.

It's always a slight chance that crap got kicked up during the initial lighting to damage wiring or fuel/oxygen lines or nick some other critical piece. Sure, once all are lit and fully running not much will come back, but that startup is still violent.

I am very impressed that the structure held together through that maneuver. Most vehicles can't stand more than a couple of degrees off-axis before the column collapses.

I'm waiting for Scott Manley for details.
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Old 20th Apr 2023, 21:51
  #340 (permalink)  
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As to how one can assume failure of a 'water deluge"... Do they have one? Where are the water towers? Not visble anyway. Isn't that why the stack is fired off a raised platform? And by what physics could debris possibly manage to return into an engine against that phasmagorical maelstrom of thrust? It's not as if it's an atmospheric engine breathing ambient air full of debris is it? Any debris from spalling concrete (which one would imagine the dimmest of SpaceX engineers would have thought of...) would simply be blown into the next county.
Sorry, just no.

​​​​​​​https://twitter.com/paddypatrone/sta...HhlFHGKbTPQr_A
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