mgnostic mentioned an Antoinette with a fat wing. This was the "replica" built for "Magnificent Men" as they were unwilling to put up with the flight characteristics of the original.

The new indoor models work very well with moulded foam wings because of the low Reynolds numbers. The microfilm guys have been using single surface wings for years with simple arcs or logarithmic curvature and about 5% camber, (IIRC). This is the extreme end of "thin" airfoils.

Almost any airfoil will work for basic flight if the wing loading is low enough. Raise the wing loading and/or push the flight envelope, and specific airfoils start to work better. I agree with Don regarding the suitability for scale WWI airfoils for our models - the challenge is to building them strong enough. That's a large reason for the fat wings we see on BUSA planes. They are thick enough to be cantilevered, an important consideration for many people.

Martin