Author Topic: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION  (Read 122623 times)

Offline mn

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #100 on: 06/15/2017 11:09 PM »
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?

Online mme

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #101 on: 06/16/2017 02:15 AM »
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.
« Last Edit: 06/16/2017 02:16 AM by mme »
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Offline drunyan8315

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #102 on: 06/16/2017 02:19 PM »
Looking at thumbnail of Bulariasat test fire over at Spaceflight Now, I think I see the payload already mounted! Anyone else see that?

Online IanThePineapple

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #103 on: 06/16/2017 02:22 PM »
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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Offline John Alan

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #104 on: 06/16/2017 02:23 PM »
Looking at thumbnail of Bulariasat test fire over at Spaceflight Now, I think I see the payload already mounted! Anyone else see that?

The payload was NOT mounted for the static fire...

On edit...
These clear pics taken before test clearly show the payload was not present...
https://forum.nasaspaceflight.com/index.php?topic=42913.msg1690320#msg1690320
« Last Edit: 06/16/2017 02:28 PM by John Alan »

Offline drunyan8315

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #105 on: 06/16/2017 02:28 PM »
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.

Online IanThePineapple

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #106 on: 06/16/2017 02:28 PM »
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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Online yokem55

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #107 on: 06/18/2017 07:55 PM »
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?

Offline mn

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #108 on: 06/18/2017 08:43 PM »
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

Quote
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.

Online guckyfan

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #109 on: 06/18/2017 08:45 PM »
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?

Offline docmordrid

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #110 on: 06/18/2017 08:52 PM »
Elon Musk ✔ @elonmusk
If schedule holds there will be two Falcon 9 launches within 48 hours (Cape & Vandenberg) this weekend https://twitter.com/spacex/status/876522478046068737
4:27 PM - 18 Jun 2017
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Online AncientU

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #111 on: 06/18/2017 09:11 PM »
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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Offline zubenelgenubi

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #112 on: 06/19/2017 06:33 PM »
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).  :o
(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? :D

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!
« Last Edit: 06/19/2017 06:34 PM by zubenelgenubi »
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Online gongora

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #113 on: 06/19/2017 06:43 PM »
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).  :o
(Italics mine)

Re: possible same day launches, one each from Cape Canaveral/KSC and Vandenberg:

This would be a launch and a static fire.

Offline Jim

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #114 on: 06/19/2017 06:56 PM »
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).  :o
(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? :D

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!

Spacex doesn't use TDRSS

So it seems that the Falcon is on the pad right now. Anyone know why?

Offline Chris Bergin

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.

Offline shuttlefan

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #117 on: 06/20/2017 12:40 AM »
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.

Offline sewebster

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #118 on: 06/20/2017 01:01 AM »
Maybe they want to test their new fairing valve in the vertical orientation or in some more realistic pre-flight scenario?

Offline old_sellsword

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Re: SpaceX Falcon 9 : BulgariaSat-1 : June 23, 2017 : DISCUSSION
« Reply #119 on: 06/20/2017 01:02 AM »
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...

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