Quote from eagleal "Three-channel models fly just fine but aren't as responsive as those with ailerons. Also dihedral is a stabilizing force that makes turns somewhat more difficult for rudder only models. "
Sorry Al, dihedral may be stabilizing force but it definately does NOT make turns more difficult with rudder only models. Just the opposite, it makes it possible to do turns with a rudder only model. If you do not believe that, try flying a 3 channel with a flat wing and rudder and elevator (no ailerons). You will find it next to impossible to make a decent turn if you can at all.