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  #1961  
Old 06-18-2019, 01:01 PM
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Hello everybody,

who wants to know more about the ET cabling as well as about the Cable trays and their Thermal protection system (TPS), here one still can find some interesting information.


Source: System Definition Handbook SLWT (Lockheed Martin)


Source: System Definition Handbook SLWT (Lockheed Martin)

As one can see in the first picture, it was distinguished between Internal and External LO2/LH2 Cabling.

But there is another important interface, namely the ET/SRB interface between the ET and the SRBs, about whose cables, sensors, etc. the separation of the burned SRBs has been activated.

And unfortunately, this interface with the associated Cable Tray is also missing in the Airfix Kit and therefore also needs to be scratched.



In this photo of the ET-8 one can see the transition of the Cable Tray from the vertical strut to the SRB Support, where the wiring passes through the Upper Attach Strut.


Source: forum.nasaspaceflight.com (woods170)

This also makes it clear what these strange extensions at the end of the vertical strut mean, which I have noticed time and again.


Source: nasaspaceflight.com (woods170)

These are the cable ends running from the root point of the Upper Attach Strut to the Aft ET/SRB Attach Ring (see previous picture).

And these are those cables that can be seen in this photo, which can be seen at the bottom of the SRB Cable Tray in the previous image,


Source: NASA
and then run into the booster via the Upper Attach Strut.

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  #1962  
Old 06-25-2019, 04:18 PM
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Hello everybody,

although there is now clarity about the SRB struts, I still have problems with the shape of the Vertical strut of the ET/Orbiter Attachment, because the lower part of the Newware TPS-Facing looked a bit too clunky, why I've dealt with this assembly once again and have analyzed further photos.

For this I have repeatedly compared these two photos of the ET-8 (STS-6) and first tried to reconstruct the contours of the struts and to bring into agreement, which is not so easy, because the images were taken from different positions and thus certain details are partially obscured.


Source: forum.nasaspaceflight.com (Jester)


Source: forum.nasaspaceflight.com (woods170)
In particular, the two yellow and blue marked areas have puzzled me, whereby the yellow marked wedge-shaped foot looks somehow different than the one on the Newware strut. Whose chunky form is more akin to the struts used in later missions, as seen here in STS-134 (ET-122).


Source: NASA

Irritating is also the lower contour directly at the yellow arrowhead in the first image, which does not belong to the strut, but to the flattened SOFI pattern area of the Longeron, which is illustrated in this image by the yellow contour.



Furthermore, it can be seen from the blue dimension arrows that the lower foot part is not wedge-shaped as the Newware part.

And with this the vertical strut gets this blue drawn contour with a flowing transition to the SRB Cable Tray, which extends to the Upper Strut.



This still leaves this question mark at the blue marked recess from the first picture open, which one unfortunately can not see in this last view.

This wedge-shaped part seems in my opinion to be a part of the TPS facing which has been retrofitted, this recess probably having been finished later. In contrast to the SOFI Spray applications, these TPS parts were molded separately and mounted individually, just like the Intertank Closeouts.

And these are now the estimated dimensions for the scratch construction of the Vertical Strut, which show that especially the chunky foot part of the Newware facing does not fit the mould of the ET-8 and therefore has to be modified.



As reference dimension (yellow) was used the diameter of the rear part of the Thrust Strut, which is 16,6" at the original, which roughly corresponds to 3 mm of the Airfix part.

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  #1963  
Old 07-07-2019, 05:13 AM
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Hello everybody,

what you will have noticed already, but unfortunately I have to slow down a bit, because I have to take care more of my sick wife and our poodle Gino, who suffered two cruciate ligament tears in no time, whose second cruciate ligament tear will be operated next week.

But nonetheless, it should go on on the Launch pad.

I'm still dealing with the rear ET/Orbiter Attachments, especially since besides the adaptation of the Newware Kit parts, also some things of the Airfix Kit have to be corrected or modified.

What looks so nice and vivid on the Reference detail photos,


Source: NASA

is in scale 1:144 everything much smaller and therefore does not appear so readily feasible by Scratch-building.

That's why I've put on the orbiter, and as one can easily see, there's a hell of few place to accommodate the LH2/LO2 Umbilicals and associated Cable Trays as well as GH2/GO2 Press. Lines.



And thus immediately to a curiosity of the Airfix kit, after which the GH2 Press. Line directly discharges into the LO2 Feedline (see the small hole just before the bow), which in reality would be a disaster of course.



While the GO2 Press. Line is correctly laid and leads to LO2 Umbilical, the GH2 Press. Line runs below the Crossbeam to the other side to the LH2 Umbilical.


Source: forum.nasaspaceflight.com (DDG40)
Here are two other views with the still too chunky TPS cladding of the Vertical Strut, which I have sanded so that it fits better into the picture.





And now more details come into play, which also want to be accommodated. These are the Diagonal Strut, as well as the LO2 Feedline/Umbilical Support Brackets, of which there is also one on the other side of the bow, but which is missing,



as one can see on this image.



On this drawing one can indeed see the different versions of these LH2/LO2 Feedline/Umbilical Support Brackets very nicely,


Source: System Definition Handbook SLWT (Lockheed Martin)

however, it should be noted that all these parts are provided with a TPS cladding, which must be taken into consideration when scratching them.


Source: NASA


Source: NASA
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  #1964  
Old 07-07-2019, 05:16 AM
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These two rings here are needless, because they do not exist on the real LO2 Feedline,



as one can see on this image.


Source: forum.nasaspaceflight.com (DDG40)

On it one can see the last two (out of five) LO2 Feedline Supports with the rings in front of them, which are missing at Airfix, excepting the ring in the next picture, but after that nothing like that comes up before the LO2 Umbilical.

And finally to the chunky TPS cladding of the Vertical Strut,



which I slimmed down even further (right), as one can see here.



Now I have still to modify the left strut and its cladding accordingly, so that both sides look identically.

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  #1965  
Old 07-07-2019, 12:04 PM
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As usual when I drop in to see what's been done, the level of detail just makes my head spin around.

Hope the home situation is smoothing out.
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  #1966  
Old 07-07-2019, 02:42 PM
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Thanks whulsey for your nice words, I also hope so.

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  #1967  
Old 07-07-2019, 02:44 PM
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Hi friends,
for a better idea of the true size of these parts I've put my Cent coin on the tank.



And with some patience, I then have placed the coin on the Crossbeam, so you have a good comparison with the size of the Umbilical Plates.



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  #1968  
Old 07-13-2019, 06:41 AM
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Hello everybody,

now I will start scratch building of the LH2/LO2 Umbilical plates, which look quite nice on the drawing, but in 1:144 these are only about 7 mm x 5 mm small plates, for which I have used Styrene (1 mm). Normally, 1,5 mm thickness would be more correct, but it should be remembered that the upper part of the Umbilical Plates protrudes into the orbiter openings, whose recess I want to avoid, because this place will not be seen later anyway on the shuttle Stack. That's why I'll use 1 mm thick platelets on which then the orbiter rests flat.


Source: NASA

Since I have to take into account the distance to the Orbiter during testing the small Umbilical plates and tiny Cable trays, I've considered a small stencil (1 mm Styrene, which is much easier to handle.

On this stencil I have drawn the openings for the ET/Orbiter Attachment as well as for the two LH2/LO2 Feedlines from my scaled down drawing (1:144), as well as have cut out small paper stencils of both umbilicals.





After the plate fits quite well already (the red ones are the Cable trays),



now follows the production of the two Umbilical plates, whose drawings I have glued with transparent tape on the 1 mm Styrene plate.

In order to be able to cut out and file the small plates, I first drilled the holes ( 3 mm) for the Feedlines and plugged in rod plugs, so that the templates can not slip during handling.



And then I cut out the little plates, whereat I've always compared it with the contours of the two umbilicals in this larger photo, because the parts are really tiny and also difficult to hold, which was much facilitated by the inserted holding rod.


Source: NASA

And then I've carefully cut the contours of the stencils with the diagonal cutter and then gradually filed and ground the final shape all around, which was quite tedious.

I started with the LO2 Umbilical plate.





Then the holding stopper could finally be removed,



and this is now the finished part.



And in the same way followed the production of the LH2 Umbilical Plate.









And these are the two finished Umbilical plates,



which can now be test fitted on the Attachment.

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  #1969  
Old 07-13-2019, 06:44 AM
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And as one can see, the two parts fit quite well with the attachment.





And now a look ahead to the outer LO2 Support Bracket, which is missing on the Airfix Feedline which I have drawn red.


Source: System Definition Handbook SLWT (Lockheed Martin)

Little by little, the bird builds its nest ...

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  #1970  
Old 07-13-2019, 04:07 PM
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Hello friends,

for an even better overview when fitting and assembling the Umbilical plates and Cable trays I have made the same template of Acrylic glass (PPMA), which now allows the total vista, what is certainly an advantage when handling.





Okay, I could have come to that immediately ...

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