Author Topic: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION  (Read 228739 times)

Offline sevenperforce

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #20 on: 05/09/2016 07:14 pm »
Mass spent on thermal protection generally gets much better returns than mass spent on retropropulsion propellent.

Still, the JCSAT-14 stage doesn't look overly toasted in the pictures, and we know the SES-9 stage survived a hotter reentry in one piece before running out of prop.
We assume SES-9 survived a hotter re-entry in one piece, but all we really know for sure is that it still had enough pieces left to keep its engines firing.

If the JCSAT return stage ends up having more thermal damage on and around its underside than expected, I could see them adding a spray-on ablative paint for GTO missions, then cleaning it off as a standard part of refurbishment.

Online Herb Schaltegger


If the JCSAT return stage ends up having more thermal damage on and around its underside than expected, I could see them adding a spray-on ablative paint for GTO missions, then cleaning it off as a standard part of refurbishment.

I've held for quite awhile now that the sharply-defined discolored area around the lower part of the stage is more than simple soot deposition. I think it's either an ablative coating (or paint, serving effectively the same purpose), or some other kind of TPS. In fact, closeup photos of the CRS-8 stage following recovery look quite a bit like cork (which has been used as TPS on spacecraft in the past); if so, perhaps the darkening is actually cork scorching a bit.
« Last Edit: 05/09/2016 10:16 pm by Herb Schaltegger »
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Offline Fluke72

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #22 on: 05/09/2016 10:30 pm »

If the JCSAT return stage ends up having more thermal damage on and around its underside than expected, I could see them adding a spray-on ablative paint for GTO missions, then cleaning it off as a standard part of refurbishment.

I've held for quite awhile now that the sharply-defined discolored area around the lower part of the stage is more than simple soot deposition. I think it's either an ablative coating (or paint, serving effectively the same purpose), or some other kind of TPS. In fact, closeup photos of the CRS-8 stage following recovery look quite a bit like cork (which has been used as TPS on spacecraft in the past); if so, perhaps the darkening is actually cork scorching a bit.

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Online Herb Schaltegger


If the JCSAT return stage ends up having more thermal damage on and around its underside than expected, I could see them adding a spray-on ablative paint for GTO missions, then cleaning it off as a standard part of refurbishment.

I've held for quite awhile now that the sharply-defined discolored area around the lower part of the stage is more than simple soot deposition. I think it's either an ablative coating (or paint, serving effectively the same purpose), or some other kind of TPS. In fact, closeup photos of the CRS-8 stage following recovery look quite a bit like cork (which has been used as TPS on spacecraft in the past); if so, perhaps the darkening is actually cork scorching a bit.

give this guy a cigar!!! 

I'll take some LIKES for my post instead. ;)
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Offline sevenperforce

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #24 on: 05/09/2016 11:05 pm »

If the JCSAT return stage ends up having more thermal damage on and around its underside than expected, I could see them adding a spray-on ablative paint for GTO missions, then cleaning it off as a standard part of refurbishment.

I've held for quite awhile now that the sharply-defined discolored area around the lower part of the stage is more than simple soot deposition. I think it's either an ablative coating (or paint, serving effectively the same purpose), or some other kind of TPS. In fact, closeup photos of the CRS-8 stage following recovery look quite a bit like cork (which has been used as TPS on spacecraft in the past); if so, perhaps the darkening is actually cork scorching a bit.
I concur. The line at the top is far too sharply defined to be merely the result of some sort of thermal effect from the oxygen tank.

My guess is that the lower third of the stage has an ablative paint while the engine panels themselves are covered with cork layers. I was watching the processing of CRS-8 and I could have sworn I saw them peel off something that was black on the outside but tan on the tear surface.

If the damage to the underside of JCSAT-14 is too great then they might add more of the same.

Offline somepitch

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #25 on: 05/10/2016 12:52 am »
I wonder how many stages will have to come back for the groundhog day-like soot line debate to be put to rest...  ;D :o

Online Herb Schaltegger

I wonder how many stages will have to come back for the groundhog day-like soot line debate to be put to rest...  ;D :o

I think the debate - such as it is - has been put to rest.
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Online gongora

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #27 on: 05/10/2016 03:57 am »
The last 17 (now 18) posts in this thread have nothing to do with the Thaicom-8 mission.  This is a mission specific thread.

Offline Lar

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #28 on: 05/10/2016 03:59 am »
The last 17 (now 18) posts in this thread have nothing to do with the Thaicom-8 mission.  This is a mission specific thread.
Good point. So scattered I don't see where to move them to easily.

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Offline Ben the Space Brit

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #29 on: 05/10/2016 01:54 pm »
Question: Has the order of missions been changed or is Thaicom-8 still scheduled to launch after the Eutelsat/Asia Broadcast pair? Forgive me if I've missed an announcement at any point.
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Offline macpacheco

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #30 on: 05/10/2016 02:02 pm »
Question: Has the order of missions been changed or is Thaicom-8 still scheduled to launch after the Eutelsat/Asia Broadcast pair? Forgive me if I've missed an announcement at any point.
Thaicom is expected to launch this month. Eutelsat/Asia Broadcast planned for June. There was an inversion in order.
spacexstats suggest Thaicom-8 launch in May, 26th.
« Last Edit: 05/10/2016 02:03 pm by macpacheco »
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Offline atsf90east

The current launch date and time for Thaicom-8 is May 26th at 2140 GMT (5:40 p.m. EDT) from SLC-40.
Attended Launches: Space Shuttle: STS-85, STS-95, STS-96, STS-103. Falcon 9: Thaicom-8

Offline deadshot462

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #32 on: 05/10/2016 08:48 pm »
Apparently the range safety system will be off for maintenance until may 27th, does that conflict with this launch date or will the maintenance occur at a different time?

Offline wannamoonbase

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #33 on: 05/10/2016 09:53 pm »
Apparently the range safety system will be off for maintenance until may 27th, does that conflict with this launch date or will the maintenance occur at a different time?

I've wondered about that, seems like a rather obvious over lap. But SpaceX seems to slip at least 1-2 days from the first stated goal.

I might-could be on the space-coast for the 27th. 

After seeing Delta 2's, Atlas 2,3,5's and the space shuttle it would be something to catch an F9 launch. 
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Offline atsf90east

I know that the payload, fairing, and the Falcon 9 first stage booster are at CCAFS, but has anyone seen the second stage yet?
Attended Launches: Space Shuttle: STS-85, STS-95, STS-96, STS-103. Falcon 9: Thaicom-8

Offline rpapo

I know that the payload, fairing, and the Falcon 9 first stage booster are at CCAFS, but has anyone seen the second stage yet?
Do we ever see second stages on the road?  I can't recall it being reported up to now.  First stages, legs, and payloads, yes.  But fairings and second stages I can't recall them being reported here before.
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Offline Mader Levap

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #36 on: 05/14/2016 07:15 pm »
Do we ever see second stages on the road?  I can't recall it being reported up to now.  First stages, legs, and payloads, yes.  But fairings and second stages I can't recall them being reported here before.
This is because of size. They are easier to overlook. Just another big load on just another trailer.
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Offline philw1776

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #37 on: 05/18/2016 12:05 am »
The current launch date and time for Thaicom-8 is May 26th at 2140 GMT (5:40 p.m. EDT) from SLC-40.

This has been the quietist chatter pre-launch for any recent launch.
Something's afoot.
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Online tleski

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #38 on: 05/18/2016 12:09 am »
KSC visitor center removed the launch from their schedule. I asked them why on tweeter, no reply yet. I am not sure they would be authorized to discuss this publicly even if they knew something. I guess we will find out soon enough.
« Last Edit: 05/18/2016 12:10 am by tleski »

Offline wannamoonbase

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #39 on: 05/18/2016 12:14 am »
The current launch date and time for Thaicom-8 is May 26th at 2140 GMT (5:40 p.m. EDT) from SLC-40.

This has been the quietist chatter pre-launch for any recent launch.
Something's afoot.

I've been thinking the same thing. 

Maybe the return of the previous booster distracted people, or few of us believe the date is real.  If the static fire actually happens Sunday I'm sure we'll be back to the normal chaos next week.
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