You will find that as lightly loaded as our models are 99 out of 100 guys would not be able to tell the difference with the 2 examples illistrated. As for the 3D type airplanes having thin airfoils, I have not really seen that. Krill is really the only manufacturer that seems to like really thin airfoils. I have a feeling it leads to cost and weight reduction more then any performance gains.


As far as an auto-gyro goes, a simple flat bottom airfoil works well. No need to get fancy.