RE: Bob Nelitz 1/3 Scale J-3 Short Kit build
I assume the wood is for the main spar, that being said, plywood is not the best choice. Spruce or basswood would be the wood of choice. When you cut a strip of plywood for use on a spar, only half of the fibers are in line with the bending stress, the fibers that are 90 degrees from the bending stress add little to the strength. I would image popular wood is available in Italy? I thought that iswhere our lite ply originated, Italian Bending Plywood? I would use popular if basswood or spruce is not available.