Left Winglet Load Transfer Area
We're going to cut a block of blue, polystyrene foam two-pound per square foot density.
Cut it to fit and match the interior surface. The foam block will go from the peak on the exterior surface
of the winglet, to the peak on the bottom surface of the wing, where the transition occurs on the interior surface.
It is not as visible on the interior surface as it is on the exterior surface. If you have trouble seeing this
transition, drill a small hole from the outside through the skin in two or three places to locate precisely
where that transition occurs. That's where the compression occurs when the lift on the winglet puts force inboard
and puts tension on the inside skin creating a compression load downward and outboard into the two surfaces in
the corner. It is a very important load condition area and the first that is build on the wing.