Author Topic: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION  (Read 287714 times)

Offline BrightLight

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #320 on: 05/27/2016 10:32 pm »
Falcon 9 - 24 out of 25, not to bad.

Offline Lars-J

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #321 on: 05/27/2016 10:32 pm »
Like I said before... Probably wrong.  But that was my first impression as an avid, uneducated young grasshopper rocket enthusiast.

Given the conditions at the time the camera became clouded, what do you surmise was the major contributor, heat?  Pressure?  Condensation/icing? 

I defer to the experts here   :)
I'm no expert, but it looked mostly like condensation and heat. Someone mentioned a glass crack earlier, and it looks like the technical webcast had a longer shot that appeared to show that. Or it was some sort of dirt/debris ablated from the lower part of the stage.
« Last Edit: 05/27/2016 10:32 pm by Lars-J »

Offline NovaSilisko

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #322 on: 05/27/2016 10:32 pm »
And in such a case, the "core" refers to the central portion of the leg piston. I mean, I would assume they're not having the rocket core itself be crushed, that would probably void the warranty...

Offline abaddon

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #323 on: 05/27/2016 10:33 pm »
Or maybe the crush zone is in the leg cylinders and the stage is fine.
Well... as long as it doesn't tip over :|.

Wonder how they handle bringing in a stage that is in a potentially unsafe condition.

Offline arsenal

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #324 on: 05/27/2016 10:33 pm »
From DShadelz on the SpaceX reddit: I'm being told by an intern that "The landing legs have a crush core of aluminium honeycomb that compresses on massive impact."

https://www.reddit.com/r/spacex/comments/4l9uou/rspacex_thaicom_8_official_launch_discussion/d3mbwy6
« Last Edit: 05/27/2016 10:33 pm by arsenal »

Offline NovaSilisko

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #325 on: 05/27/2016 10:34 pm »
From DShadelz on the SpaceX reddit: I'm being told by an intern that "The landing legs have a crush core of aluminium honeycomb that compresses on massive impact."

https://www.reddit.com/r/spacex/comments/4l9uou/rspacex_thaicom_8_official_launch_discussion/d3mbwy6

Well, now we know exactly why they take the legs off.

Offline GusTurbo

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #326 on: 05/27/2016 10:35 pm »
From DShadelz on the SpaceX reddit: I'm being told by an intern that "The landing legs have a crush core of aluminium honeycomb that compresses on massive impact."

https://www.reddit.com/r/spacex/comments/4l9uou/rspacex_thaicom_8_official_launch_discussion/d3mbwy6

Makes sense. I was thinking there was no way the stage itself would be crumpling if the legs were intact.

Offline Lars-J

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #327 on: 05/27/2016 10:36 pm »
From the update thread: (people, read the thread titles!)

elonmusk: Rocket landing speed was close to design max & used up contingency crush core, hence back & forth motion. Prob ok, but some risk of tipping.

https://twitter.com/elonmusk/status/736320322996076548

Does this explain what looks like a list to F9 on the barge ??

No, that is because of the wide angle lens.

Offline Ohsin

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« Last Edit: 05/27/2016 10:40 pm by Ohsin »
"Well, three cheers to Sharma, but our real baby is INSAT."

Offline Skylab

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #329 on: 05/27/2016 10:39 pm »
Sorry if this is a duplicate question, but I've noticed the S1 landing very close to some white object on the deck that I can't recall from earlier attempts/landings. What is that?

Offline Jarnis

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #330 on: 05/27/2016 10:43 pm »
Sorry if this is a duplicate question, but I've noticed the S1 landing very close to some white object on the deck that I can't recall from earlier attempts/landings. What is that?

Probably some kind of fire hose... it is right in front of the camera, not on the deck but on top of the container that also has the camera.

Offline Zed_Noir

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #331 on: 05/27/2016 10:44 pm »
Did SpaceX have strips of materials in the grid fins to indicate interaction with the atmosphere by flaring up?

Offline abaddon

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #332 on: 05/27/2016 10:48 pm »
A few fun facts:
- F9 FT ties F91.0 for the second-most flown variant of F9; now a perfect 5 for 5
- 6th successful flight since loss of CRS-7
- 5th flight of calendar 2016
- 4th successful landing out of 6 attempts (4th out of 5 for F9 FT) since first successful landing (Orbcomm OG-2)
« Last Edit: 05/27/2016 10:50 pm by abaddon »

Offline Ohsin

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #333 on: 05/27/2016 10:52 pm »
https://twitter.com/elonmusk/status/736328917317910528

Quote
Crush core is aluminum honeycomb for energy absorption in the telescoping actuator. Easy to replace (if Falcon makes it back to port).
"Well, three cheers to Sharma, but our real baby is INSAT."

Offline Endeavour126

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #334 on: 05/27/2016 10:55 pm »
A few fun facts:
- F9 FT ties F91.0 for the second-most flown variant of F9; now a perfect 5 for 5
- 6th successful flight since loss of CRS-7
- 5th flight of calendar 2016
- 4th successful landing out of 6 attempts (4th out of 5 for F9 FT) since first successful landing (Orbcomm OG-2)

In addition this is the sixth launch in 158 days (new record for SpaceX). The previous was six in 169 days with the sixth not success (CRS-7).
« Last Edit: 05/27/2016 10:57 pm by Endeavour126 »

Offline arsenal

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #335 on: 05/27/2016 10:56 pm »
https://twitter.com/elonmusk/status/736328917317910528

Quote
Crush core is aluminum honeycomb for energy absorption in the telescoping actuator. Easy to replace (if Falcon makes it back to port).
How will the crew be able to work on it if there is a chance that it could fall over? This will be interesting.

Online Herb Schaltegger

From the update thread: (people, read the thread titles!)

elonmusk: Rocket landing speed was close to design max & used up contingency crush core, hence back & forth motion. Prob ok, but some risk of tipping.

https://twitter.com/elonmusk/status/736320322996076548

Does this explain what looks like a list to F9 on the barge ??

No, that is because of the wide angle lens.

Disagree. Elon wouldn't make multiple references to stage possibly tipping if there wasn't a risk. And it seems pretty clear that one leg compressed more than the other three, given Elon's tweets - I don't think the possibility of asymmetrical crushing is a surprise to them. I think the risk is that the stage will tip before or during efforts to secure it in the next several hours.
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Offline kevinof

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #337 on: 05/27/2016 10:59 pm »
If it's stable (ie not moving) then stick some opposite list into the ASDS and bring it to vertical.

https://twitter.com/elonmusk/status/736328917317910528

Quote
Crush core is aluminum honeycomb for energy absorption in the telescoping actuator. Easy to replace (if Falcon makes it back to port).
How will the crew be able to work on it if there is a chance that it could fall over? This will be interesting.

Offline JebK

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Re: SpaceX Falcon-9 - Thaicom-8 - May 27, 2016 - DISCUSSION
« Reply #338 on: 05/27/2016 10:59 pm »

Quote
How will the crew be able to work on it if there is a chance that it could fall over? This will be interesting.

Maybe they won't go on board OCISLY and that is why Musk is implying that it may not make it back to port.

Online Herb Schaltegger

Did SpaceX have strips of materials in the grid fins to indicate interaction with the atmosphere by flaring up?

Nope. That's supersonic (perhaps still locally hypersonic) air flowing through the grids of the fins and causing localized heating of the ablative coatings applied to the fins.
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