RE: Piper Cub Sailplane
I would change the incidence of the wing in comparison to the fuse. It looks like the wings chord line is 0* to the fuse. I doubt that the wing at 0* will generate enough lift to support the glider at practical airspeeds. It also looks the longitudinal dihedral is 0*. This will require the stab to carry quite a bit of uptrim at cruise. How about shimming the wing to +2*?