RE: two airfoils on one wing
Bax do you have a drawing of the 8037?
I know now that that was used on several models but have not seen what the profile looks like.
The reason I had chosen the eppler 230 is that the design I am working on has some of the properties of a flying wing to some degree. One other thing I had in mind with using the eppler was to counteract the pitch down effect of the main wing area to take a bit of the down force load off of my tail surfaces.