A friend of mine constructed a 3-D aeroplane. It looks a bit like the Modeltech Magic, but it is bigger (64 inch wingspan). When I saw the wing, I thought it would never fly: a very roundish leading edge, I would estimate about 5 inches (!!!!!) and then the upper and lower airfoil going straight back to the trailing edge, fully symetrical.
I think he used one of these tubes, which FedEx, UPS, or DHL are using, to shape his leading edge.
The model (I call it IKEA-Magic,
) is powerd by a Saito 72, 4-stroke) is the proof, that what we learn in aerodynamics is all wrong...
It lifts off after 5 feet groundrun and does all kind of wild 3-D stuff.