I have a pair of new foam core wings for my Byron Beechcraft Baron 58. They are white styrofoam. I have added the 6 inch tips to each of them. One wing is perfectly straight. The other has a bow about 60% to 70% of the way out from the root. This condition existed prior to adding the tips. Oddly, these wings do not get sheeted. They are supposed to be glassed right over the foam and over the control surface gap seals (1/64th ply). The gap seals are 1/64th ply and sit in reliefs in the foam wing core about 1 1/2 inches cordwise by the length of the wing.

I have reverse stressed the wing by blocking up the tip and root and putting about 10 pounds of weight in the center creating about a 3-4 inch reverse bow. Finally after a week of sitting and using a heat gun (cautiously) as well, the bow went to neutral. In the next 24 hours, while getting ready to glass the wing, the bow returned.

I am afraid that even if I get the bow to neutral and glass it that the bow will return and the glass alone will not halt this condition. Nothing ruins an airplanes flying characteristic worse than being built crooked.

Is there a better way to remove the bow? Should I cut the core in two cordwise and try rejoining it?