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  #11  
Old 05-17-2022, 07:36 PM
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georgegassaway georgegassaway is offline
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Quote:
Originally Posted by jeffyjeep
Ya' know, even at 1:70 scale I don't see any reason NOT to replicate the full length conduit for the LJII--therefore I can fill the gap with it, and then of course replicate a shortened conduit for the opposite side.

TBC

Yeah, I used the long conduit to cover the seam on my models. The conduit was .005" styrene, forcibly curved over a tight radius to set the curve in it. But over time sometimes it creeped up. If I did it again, I'd vac-form .005" over the correct radius tube and then cut strips from it.

BTW - the PERFECT match to the Little Joe-II corrugations, is the Evergreen "Metal Siding" sheets (I think the Plastruct may be the same, but Evergreen does sell 12" wide, 22" long sheets, so it can be done in one wrap). See cropped part of the drawings on my website to see what they look like.

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  #12  
Old 05-17-2022, 08:23 PM
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Thanks again George. As for the Evergreen Metal Siding, do you know if it's the #4528, 2mm spacing?
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  #13  
Old 05-17-2022, 10:15 PM
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Quote:
Originally Posted by jeffyjeep
Thanks again George. As for the Evergreen Metal Siding, do you know if it's the #4528, 2mm spacing?

Screw metric. The Evergreen siding is MADE in inch units. And therefore metric "approximations" really f*** things up, especially for those who convert back to inches those approximations which will never be accurate.

Here is a link to what Evergreen offers. Corrugation spacing from .030, .040, .060, .080. .10, and .125 (inches).

https://evergreenscalemodels.com/co...ed-metal-siding

Also, I misremembered the 12" widths come in 24" lengths, not 22".

Anyway, .060" spacing, for 120 corrugations, is 7.2" across. Dividing by Pi, that would be about 2.29" diameter. So, a bit oversize for a BT-70 (2.217"), if curled into a tube to be flush with a BT-70 Service Module.

Also, that Evergreen plastic, at least the .10" spaced sheets I used, is about .04" thick, and the corrugation recesses about .020". So there is a constant thickness of .020 for the rest. So when curled into a tube, the outside diameter is a bit more than it should be from what math indicates (greater than say if one used a sheet of paper of the same width). And therefore that is part of how I arrived at the odd scale factor of 1/39.5, the diameter of the curled Evergreen Metal Siding tube was what everything was based on. Well, technically it was not exactly 1/39.5, it was say 1/39.463 or whatever, and I rounded it up for sanity of scale dimension calculations.

Now actually for my 1/100 model, I was unable to create a perfectly round Tube, it kind of bulged along the seam side (Somehow, Tom Beach managed to do it round). So for a contest (Peanut Scale) 1/100 model, I made an epoxy/fiberglass cloth wraparound. I used the .040" spacing plastic as a mold, carefully poured an epoxy (tinted red for better visibility of bubbles) that was somewhat flexible after curing, making sure to get rid of any bubbles, and laid a sheet of raw fiberglass cloth over it. Then put flat glass over that, added weights to press on it and squeeze out excess epoxy, and let it cure. Afterwards, the epoxy/glass cloth wrap was peeled away, and I had a flexible wrap that I could add to a custom diameter tube I had made, so the final diameter would be correct. But I think it took me about 7 tries to get two "perfect" wraps. Some had pinhole bubbles, and another stretched out of shape as I tried to remove it. That was a method I had learned from John Pursley (for his Saturn-V corrugated wraps).
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Last edited by georgegassaway : 05-17-2022 at 11:39 PM.
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  #14  
Old 05-19-2022, 11:05 PM
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My 12" x 24" sheet of Evergreen #14527 came today. I can now wrap the 1/70 scale LJII booster without having to splice. This one sheet should last me until the next ice age.

Thanks for the help George.
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