HI…
Well it seems I have sparked a rather anemic debate. One consolation is like in our little club, we have folks on both sides. One theory advanced by one of the full scale guys in our group is that the screen represents a contaminated airfoil and will not allow the generation of lift.
It seems I may just have to spend some time in the Lab (He means shop) with the wind tunnel (he means blow side of a shop vac) and a rather sophisticated airfoil (He means piece of wing from wrecked aircraft) and see what kind of data I can accumulate.

bert.