RE: repairing foam wing for firebird?
I would suggest using foam safe CA or 5 min. epoxy. Tooth picks are a good way to brace a broken wing. Push half of toothpick in one wing with CA, then put CA on broken wing half and exposed toothpicks and press into other half of wing. If you still think in needs more strength use packing tape on seam. I'd stay away from duct tape because of weight.
Good Luck