ASK THE EXPERTS: Wings and Airfoils

The under-cambered airfoil used with the Slow Stick and many other backyard flyers allows the model to fly easily at very slow speeds. Q I started flying backyard RC planes about two years ago and learned to fly with my friend's GWS Slow Stick. I have noticed that the Slow Stick trainer has a molded wing that's a lot thinner than other more sophisticated planes available. Is it the shape of the wing that makes...