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Old 10-19-2006, 12:26 AM   #1
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D tube dilemma.

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I bought a partially framed up airframe off a guy on here. Last night, I started finishing it up, and I noticed the shear webs are on teh wrong side of the spar.

I have 3 options.
1) Continue putting them on the wrong side. Im not sure what this will do to the struture, probably nothing, but I'd like to ask.
2) Put the rest of them on the correct side.

3) Put the another set on the correct side, leaving the "incorrect" ones where they are.

This is a Skyward 60, which is a heavy plane to begin with. I'm going to be drilling a bunch of holes in the slabs of balsa in the fuse, and I'd hate to add weight if I don't need to. (I'm not normally concerned with weight, but this is REALLY heavy, even for my standards). I don't care about deviating from the plans, but I don't want to affect the integrity of the spar. The front of the wing gets sheeted, top and bottom, to the rear of the spar. if I were to place the shear webs where the plans indicate, they would be on the leading edge of the spar. They are currently on the TE of the spar. (which will be outside of the sheeting)

I'm concerned, as I've recently found a fondness for overpowering and totally thrashing on trainer type aircraft. I need this wing to be strong, so it will withstand the punishment, yet still be able to tow something if required, or even to be used as a demo plane for new guys.

Here's 3 thousand more words, hopefully it's easier to understand what I face. Any input appreciated.
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Michael Gyger
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Old 10-19-2006, 01:27 AM   #2
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Mike, it really doesn't matter which side they are on, but I think I would leave the ones that are on wrong and just redo on the correct side. Probably be good to do both wings the same though.
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Old 10-19-2006, 05:20 AM   #3
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If it was me, I would pop the shear webs off and recut them so they fit inbetween the spars. You end up with a I Beam which is much stronger. It is more work because you can't have any space between the spar and shearweb. I would also put thicker webs near the root of the wing and workout to thinner webs near the tip.


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Old 10-19-2006, 06:48 AM   #4
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I've seen other planes with the sheer web on the rear side of the spars.

As long as 1) they are well glued 2) the grain runs veritically, I don't think it make a rat's ass of difference.

I would put them all on the same side to make the two halves of the wing consistant with each other.
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Old 10-19-2006, 08:11 AM   #5
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For this particular application I dont think it will make any difference whether the webs are on the front or back.
I would keep all the webs on the back of the spars on both wings and make sure to carry the front sheeting back and over the spars and webs.
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Old 10-19-2006, 10:39 AM   #6
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Has the same strength on either side of the spar. Sheeting usually goes halfway across the spar. When you put the capstrips down, they cover the back half of the spar to the trailing edge sheeting.
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Old 10-19-2006, 08:03 PM   #7
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Thanks guy's.

I'm going to put them all on the back.

Tough days when I have to go to the internet to get modellers opinions. ARF's don't teach you nothing about construction!!!

Well, there is that one guy, but he has funny ideas, and makes mountains out of molehills, and has 3 stories for every problem.
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Old 10-19-2006, 08:17 PM   #8
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Considering how much extra weight that TWO sets of shear webs won't add, I say that either side or both sides will be adequate. I-beams are stronger, but I find that they are best built by someone with more patience than I have.

I don't build any model (except rubber power) without D-tube, it just works too well for the small amount of added weight.
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