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  #1521  
Old 12-20-2017, 09:45 AM
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spacerunner spacerunner is offline
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Originally Posted by dhanners View Post
What was technically known as the Aft Skirt Thermal Curtain (ASTC) was a structure of nine layers of woven insulated material that was a little over 2.5 inches thick. The ring around the RSRM nozzle was made up of 24 segments hand-sewn together.

As best I recall, the colors changed during the course of the shuttle's history; I was able to find photos of the Atlantis mission I modeled and the ASTC on its RSRMs was a tan color.

It is dense reading, but here is one technical paper on them: https://ntrs.nasa.gov/archive/nasa/c...9940012651.pdf

And, oddly enough, unused segments show up on eBay from time to time: https://www.ebay.com/itm/Space-Shutt...p2047675.l2557
Thanks David for the great information and sources.

I'm not only interested in how the details look like, but as a former researcher I also want to understand their structures and construction, the materials used, technical correlations, etc. ...

I used to think that they were solid materials, and in this sence it sounds rather unbelievable, that the 24 ASTC segments are hand sewn together during installation on the aft skirt.

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  #1522  
Old 12-20-2017, 11:55 AM
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Originally Posted by spacerunner View Post
Hi Becky,

first of all thanks for the great article and photos, which are a crucial help for solving one of my last riddles about a strange equipment on the interior walls of the SRB Exhaust Chambers of the MLP.



When looking at the circled detail of this photo, I immediately recalled, because it's strangely wrapped on many photos, as one can see here.


Source: NASA

Here one can detect a little bit more,


Source: NASA

and here one can see it under the SRB Aft Skirt,


Source: NASA

in direct contact with the above circled interface, and both parts are like chalk and cheese.



If I did not have you, Becky!

But nevertheless the question remains, what these equipments were used for?

Maybe dhanners can help?

I'll do some research, but my guess is the panel has some sort of receptacles for ground-test equipment, or some sort of umbilical connection to the pad. The aft skirts are actually chock full of various gizmos.

Last edited by dhanners; 12-20-2017 at 12:16 PM.
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  #1523  
Old 12-20-2017, 08:18 PM
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beckychestney beckychestney is offline
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GSE testing leads or part of the ignition sequencer would be my guesses. But they're ON LY guesses!
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  #1524  
Old 12-21-2017, 06:33 PM
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spacerunner spacerunner is offline
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Thanks Becky and David,

I also think, that is a kind of umbilical interface, for whatever.

But before I start with this, I want to wait some time, because my friend Joe from the ARC Forum has offered his help to try to model this part in 1:144 for 3D printing.

These are the parts of the Airfix SRB & Aft Skirt,



and here is my little sketch of the Aft Skirt Thermal Curtain (ASTC), which is desribed in this interesting report SRB Thermal Curtain Design Support.



The ASTC is made up of twenty four segments, which are hand sewn together during installation on the aft skirt, what one can see here.


Source: NASA

In this report there are some interesting drawings oft the ASTC, which might be helpful during 3D modeling of this detail.





That's why I'm thinking, that the segments should be more curved than in my friend Bill's 3D model (1:72), where they are more flat.


Source: shapeways.com (niParts)

In my opinion White Strong & Flexible should be a good choise for the 3D print.
Now I can only hope, that my friend Joe can come up with a good approach.

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Last edited by spacerunner; 12-22-2017 at 09:08 AM.
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  #1525  
Old 12-22-2017, 05:05 PM
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spacerunner spacerunner is offline
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Hello my friends,

at this point I want to remind you once again of my Christmas decorated MLP from the previous year,



and wish you all

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  #1526  
Old 12-22-2017, 05:57 PM
elliott elliott is offline
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I love it! Merry Christmas and a Happy New Year to you, Manfred, and to those you love!
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  #1527  
Old 12-22-2017, 06:27 PM
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Thanks elliott for your good wishes, and also to you and your family Merry Christmas and a Happy New Year.
A girlfriend in our Raumcon forum has further decorated my MLP nicely.



Now Santa Claus can come ...

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  #1528  
Old 12-22-2017, 06:45 PM
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beckychestney beckychestney is offline
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which are hand sewn together during installation on the aft skirt,

"Hand sewn" are words I never would have thought of in relation to SRB's!

Merry Christmas!
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  #1529  
Old 12-23-2017, 09:15 AM
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Quote:
Originally Posted by beckychestney View Post
which are hand sewn together during installation on the aft skirt,

"Hand sewn" are words I never would have thought of in relation to SRB's!

Merry Christmas!
It's kind of akin to the bathtub caulk used to glue on the Orbiter's thermal protection tiles....
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  #1530  
Old 12-24-2017, 09:21 PM
amora5828 amora5828 is offline
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Hello there Inwas wondering if you ever finished the platform model and I also noticed that his picture were posted on 2013
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