In One of the test reports they suggested the wing I built for my clipped wing one. They said to use 36" spruce for spars, no dihedral then attach tips as per plan. Of course they explained a little about aileron installaton. The cost of building the wing like that was no more than $15. I built both for my second cub but only used the clipped wing one. It was either MAN or RCM that carried that article.