Let me rephrase my question: what are the ground valves for?
I really don't get people who complain about SpaceX and transparency. Musk is often way more transparent than I would be in his position.
Quote from: mtakala24 on 12/18/2015 08:57 pmElon Musk @elonmusk 27s27 seconds agoAborted on ignition timing due to slow ground side valve. Adjusting ignition sequence by 0.6 secs for next attempt.Sounds like the rocket is behaving, but the GSE let them down on that attempt.Willing to entertain thoughts
Elon Musk @elonmusk 27s27 seconds agoAborted on ignition timing due to slow ground side valve. Adjusting ignition sequence by 0.6 secs for next attempt.
Quote from: Chris Bergin on 12/18/2015 09:02 pmQuote from: mtakala24 on 12/18/2015 08:57 pmElon Musk @elonmusk 27s27 seconds agoAborted on ignition timing due to slow ground side valve. Adjusting ignition sequence by 0.6 secs for next attempt.Sounds like the rocket is behaving, but the GSE let them down on that attempt.Willing to entertain thoughts Should have used Dev2, to do pad workups, like done in Vandy.
- fresh and greywater for pad facility lavatories
with what we know that would be speculation, but there's- ground based valves for 1st stage kerosene feed input (multiple along the line plus safety redundants)- ground based valves for 1st stage kerosene detanking (dito ...)- ground based valves for 1st stage lox feed (...)- ground based valves for 1st stage lox detanking- ... same for 2nd stage ...- ... and possibly payload (not used on this mission, but valves might be present for future/dragon flight)- Niagara sound supression system water flush valves- fire prevention/extinction system liquid valves- valves for LOX coolant (liquid N2?) - feed/release valves for auxilliary fluids (liquid He for tank pressurization, nitrogen thruster tanks, ...) (are they fed on pad or pre-filled in hangar?)- fresh and greywater for pad facility lavatories- ...if you think about it for a while, theres ****loads of valves on a pad, maybe even more than on an oilrig
Quote from: 411rocket on 12/18/2015 09:14 pmQuote from: Chris Bergin on 12/18/2015 09:02 pmSounds like the rocket is behaving, but the GSE let them down on that attempt.Willing to entertain thoughts Should have used Dev2, to do pad workups, like done in Vandy.To be fair, the previous attempt was aborted due to a second stage issue. So while they would've caught a lot of issues, it wouldn't have been flawless.
Quote from: Chris Bergin on 12/18/2015 09:02 pmSounds like the rocket is behaving, but the GSE let them down on that attempt.Willing to entertain thoughts Should have used Dev2, to do pad workups, like done in Vandy.
Sounds like the rocket is behaving, but the GSE let them down on that attempt.Willing to entertain thoughts
...that's the language of an excited ubergeek. Go temporarily light that candle!
Elon Musk @elonmusk 7s7 seconds agoRounding up to 1 sec for a bit of timing margin. Updating flight computer command sequence …
L2 now has an instantaneous T-0 of 20:29 Eastern for the attempt on the 20th. Previously was a three hour window. Next opportunity on the 22nd is showing a 15 minute window!
From the Update thread:Quote from: Chris Bergin on 12/18/2015 10:03 pmL2 now has an instantaneous T-0 of 20:29 Eastern for the attempt on the 20th. Previously was a three hour window. Next opportunity on the 22nd is showing a 15 minute window! Window changing from three hours to instantaneous.Is that because they are making a change to the vehicle so that it doesn't have the performance needed to support a 3 hour window? Not cooling the LOX so much perhaps?