Originally Posted by whitecrest
Here's Clark Y and NACA 4412 superimposed in AeroPlot:
Interesting, you might also find this interesting. I went to UIUC database and found the Clark Y smoothed and I did a similar overlay. First, what I did was adjust the thickness and camber of the NACA 4412 so that it matched the "smoothed" Clark Y and then I overlayed the Clark Y. It's not just coincidence that the match gets closer.