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#100
by
mn
on 15 Jun, 2017 23:09
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Possible final pre-ignition LOX dump occurring.
I don't think I've ever seen a 'pre-ignition LOX dump' mentioned before, Is that really a thing?
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#101
by
mme
on 16 Jun, 2017 02:15
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Possible final pre-ignition LOX dump occurring.
I don't think I've ever seen a 'pre-ignition LOX dump' mentioned before, Is that really a thing?
I believe they shut the valves and vent the umbilical before ignition so there is usually a large cloud of LOX->GOX. Every launch on the discussion thread someone will write "What was that?!?!?"
Watch NROL-76 at T-01:40.
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#102
by
BeamRider
on 16 Jun, 2017 14:19
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Looking at thumbnail of Bulariasat test fire over at Spaceflight Now, I think I see the payload already mounted! Anyone else see that?
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#103
by
IanThePineapple
on 16 Jun, 2017 14:22
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Looking at thumbnail of Bulariasat test fire over at Spaceflight Now, I think I see the payload already mounted! Anyone else see that?
It's not. You can see it's not in many other pictures
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#104
by
John Alan
on 16 Jun, 2017 14:23
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#105
by
BeamRider
on 16 Jun, 2017 14:28
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Yes I see now... I mistook a patch of sky showing through the tower structure as the dome of the fairing. Thanks and sorry to bother.
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#106
by
IanThePineapple
on 16 Jun, 2017 14:28
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Yes I see now... I mistook a patch of sky showing through the tower structure as the dome of the fairing. Thanks and sorry to bother.
Oh, it's no problem, we all make mistakes.
After all, it IS rocket science
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#107
by
yokem55
on 18 Jun, 2017 19:55
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So by fairing valve, do they mean the little vents visible on the pad that pop off in flight? Or could it be the plumbing that takes care of the thrusters for fairing orientation after fairing sep?
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#108
by
mn
on 18 Jun, 2017 20:43
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So by fairing valve, do they mean the little vents visible on the pad that pop off in flight? Or could it be the plumbing that takes care of the thrusters for fairing orientation after fairing sep?
From update thread
Postponing launch to replace fairing pneumatic valve. It is dual redundant, but not worth taking a chance.
https://twitter.com/elonmusk/status/876536406230712320
I'd guess that pneumatic valve is related to fairing separation.
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#109
by
guckyfan
on 18 Jun, 2017 20:45
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Given that they have done complex repairs over night before. Given that launch weather is not favorable. Given that they are planning on a continued high launch cadence. Maybe they decided to not push as hard for launch as they have sometimes done?
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#110
by
docmordrid
on 18 Jun, 2017 20:52
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#111
by
AncientU
on 18 Jun, 2017 21:11
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Given that they have done complex repairs over night before. Given that launch weather is not favorable. Given that they are planning on a continued high launch cadence. Maybe they decided to not push as hard for launch as they have sometimes done?
May need to de-encapsulate the payload...
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#112
by
zubenelgenubi
on 19 Jun, 2017 18:33
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Static Fire is June 20. Two individual launch teams, so possible to keep to the schedule, even if SpaceX launches BulgariaSat-1 the same day (based on the new back up date to the new NET 19th target). 
(Italics mine)Re: possible same day launches, one each from Cape Canaveral/KSC and Vandenberg: This presumes that there is no interference with TDRSS supporting two overlapping launch campaigns?
No immediate clash to Atlas V/EchoStar 19 then unless Atlas V slips to end of window - the launch window for Atlas V closes 13 minutes prior.
One is at the Cape and another is at Vandenberg, would that really be an issue? 
Could be, depending on TDRS scheduling. Atlas VAFB launches use TDRS east, and possibly all 3 locations depending on the flight profile. Not sure about SpX.
And Echostar is definitely using TDRS east.
It's not just the launch window, it's how long through the plus-count TDRS is required.
Will one or both SpaceX launches use TDRSS? If the answer to both launches is YES, then...
Are there any potential TDRSS scheduling conflicts, given two same-day launches?
Does Chris' statement imply that there are no such scheduling conflicts--or that the potential conflict is already worked out?
Inquiring minds want to know!
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#113
by
gongora
on 19 Jun, 2017 18:43
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Static Fire is June 20. Two individual launch teams, so possible to keep to the schedule, even if SpaceX launches BulgariaSat-1 the same day (based on the new back up date to the new NET 19th target).
(Italics mine)
Re: possible same day launches, one each from Cape Canaveral/KSC and Vandenberg:
This would be a launch and a static fire.
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#114
by
Jim
on 19 Jun, 2017 18:56
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#115
by
tvg98
on 19 Jun, 2017 23:43
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So it seems that the Falcon is on the pad right now. Anyone know why?
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#116
by
Chris Bergin
on 20 Jun, 2017 00:12
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So it seems that the Falcon is on the pad right now. Anyone know why?
Asking.
Can't be another static fire. Previous was deemed good and you get notices of roadblocks etc before such an event. We'll find out.
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#117
by
shuttlefan
on 20 Jun, 2017 00:40
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So it seems that the Falcon is on the pad right now. Anyone know why?
Asking.
Can't be another static fire. Previous was deemed good and you get notices of roadblocks etc before such an event. We'll find out.
It was a surprise that they rolled out again so maybe static fire, roadblocks etc. are coming too.
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#118
by
sewebster
on 20 Jun, 2017 01:01
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Maybe they want to test their new fairing valve in the vertical orientation or in some more realistic pre-flight scenario?
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#119
by
old_sellsword
on 20 Jun, 2017 01:02
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Maybe they want to test their new fairing valve in the vertical orientation or in some more realistic pre-flight scenario?
But the fairing isn't attached...
