Hi Terrelflyer,

Thanks for your reply. You are absolutely right about carbon fiber not having any compressive strength! I DID intend to fly inverted however and in this mode, the carbon fiber strip on the top wing surface would now be in tension. By the way, I modified a 30 watt soldering iron into a "hot knife" by installing a ground-down long two inch long machine screw. This does work, but not too well. Is the X-Acto "hot knife" any better? Or, are there any other commercial products that would be good to use to remove the foam between the cap strips?