ILL Fitting Wings and Stabilizers.

I Know, This is like a plague for aircraft builders, because it's so obvious;

      I am asking you to visualize the top and bottom of the wing at the root. Hold them together. Now, put a straight Edge on the surface, top to bottom. Notice anything? You should ( in most cases, that is). The wing root surface where it joins the fuselage is not flat. Rather it sticks out at a VERY Shallow angle from the surface of the wing to the seam.

        Basically a very Shallow " V" that's hard to see. This Vee is part of the problem. It is there to allow the wing parts to pop out of the mold. This must be flat and square from the top to bottom. Or very close to it. Sometimes a shallow angle to set proper dehidral. For that reason the top of the wing is a infinitesimal of measurments shorter than the Bottom.

       Many model plane kits also, I have noticed, have the wing root location on the Fuselage is also molded with that shallow "V" taper. For that reason I take the rounded part of the small end of my sanding stick and sand front to back till the whole area is slightly dished, Microscopically. Be careful NOT to dish out the top and Bottom Virgin edges.

     This allows the surfaces of the Wing, Top and Bottom to tuck closer to their proper location. I learned the technique way back when wings were solid. Why? Well, spackling compound took to long to dry, shrunk and flaked off around the edges instead feathering like I had hoped,When Sanded.

 The more brutal way is to cut off the wing locator tab. Sand both surfaces blazingly smooth and square, Allowing for Dihedral. Drill a hole in the wing root and insert a brass spar piece to support it and Epoxy the whole thing, making sure NOT to mess up landing Gear Wells wtc.