> So it'll glide like a duck full of buckshot <

BMatthews is so right. Last year I built a 1/2A plane with a flat wing. It flew great when the engine ran (not always the case!), but when it quit, "Look out below!" I converted it to a "ribless" wing by glueing spars of varying height atop the wing to provide some camber. Now it had a decent glide (but that didn't help the unsteady engine, though.)