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For the ribs I lay up a cored sheet using closed cell foam and then cut it into the rib shapes. These are then bonded into one half off the wing and then finally the two halves are bonded together with ET515.
I have tried filling the void with expanding foam and then clamping the two halves together. The problems I found was judging how much foam to put in, not enough and it won't fill the void too much and it can actually distort the wing. I also found that you can end up with pockets of foam that haven't cured fully.
One method that did work was to put the foam into each half off the wing, let it expand and cure. Then trim the foam back to the split line, you now have a nice big flat area to bond the two halves together. Just make sure that the adhesive you use wont attack the cured foam.
Hope that helps.
Warren
Carbon Copies Ltd
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