Gliders > Slope Soaring

I'm drowning, in bits of an Mu28

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gerryb:
a little clarification here keith, i think.

i think brian's advice refers to using epoxy as the adhesive to stick the veneer to the foam as this is a slow set glue.

copydex on the other hand is an impact glue (like the old evo-stick). you coat both surfaces thinly with copydex (which can be thinned slightly with water, helps the glue to spread easily), allow to dry for 10 to 15 min and then very carefully place thin pieces of balsa or such like across the foam, every 12" or so. you then place the veneer, glue side down onto cross pieces. don't worry, it won't stick to them. align the veneer over the foam and then one by one, carefully remove the cross pieces. gently press the veneer on to the foam as you go and watch your wing develop before your eyes. childs play!!

if you go this route, do be aware this method is a one shot only method, once copydex grabs, it stays grabbed. get it wrong and you bin the lot. i suggest a practise session before you go for real. great system but you have to get it right 1st time

Brian:
Hi Keith,
When using a slow glue ,that cures hard, the more pressure you use the less glue you need and the stiffer the bond and the stiffer the result/wing etc.
With high aspect wings stiffness is important especially if you want to fly it hard and in tough conditions
I think this is you.
You do not want a floppy wing !!!!

Brian

Happy Days:
Thank you gentlemen. :clap:

 Considerable food for thought. :?:  :?:

Keith

Happy Days:
So,......moving on & let’s move on the next problem…..

Each wing half is made up of three foam core sections, ( each section lines up beside each other)



The problem is very hard to show in a photo as it requires photographing something white next to something white.



Between my fingers, (okay Gerry, 'between my fingure and thumb') in the picture are the edges of two of the foam bases. My fingers are pushing the bases down onto a flat surface but there is a ridge. (Look carefully and give your eye time to ‘get in’ and you’ll see the ridge)That is to say, the edge of one of the bases is not at the same height as the other edge of the adjacent base.
If I place the wing core, and then the top of each section in place on all of the sections  the ridge is still apparent across the tops of the sections, i.e. each section has a different height.

In other words the base parts of each of the three sections is a different thickness. In addition, some of the base sections have different thicknesses from front to rear of the wing. So that although the front of two adjacent base section sections might be flush, the rear part of those same two sections might not be flush.

I’ve tried putting the sections up-side-down on the bench to see if that made the wing cores line up flush, but it doesn’t.

Clearly I can’t just gust glue the foam cores together as they are.

Anyone got any ideas?

Keith :cry:  :cry:

Richard Boyd:
Hi Keith, I have not got my head around what you mean,
Maybe if the length of the each core was trimmed it would fit snuggly together, I am by no means an expert on wings or building gluing cores.

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