Made a little Cap 10 B from pink foam, Cd Rom motor, that was a little to high a wing loading. Extended a nother piece of foam over and ahead of the canopy and added another wing the same size as the lower wing and directly overhead so as not have to change the CG. Now it flies the way it should. As Matt says, don't be afraid to experiment. That's why this hobby never gets boring. Been at it for more than 50 yrs. and not bored yet.