This is what the airfoil should look like. Stan has found that this airfoil design seems ideal.
Metal Pivot Screw Problems
Stan suggests you put a piece of masking tape over the screwhead of the fuselage pivot screw that secures the tailboom. Failure to do so could result in the screw coming undone during flight, resulting in damage. He has noticed that the screw tends to loosen after a few flights.
Nylon screws used in place of metal screws do not appear to experience these problems.