There's lots of answers, particularly when you consider drag, side force, center of pressure, and shedding frequency, among others (not to mention that the rim profile needs to function as a leading edge as well as a trailing edge). Some answers happen to be much better than others. Hence the iterative process I mentioned.
There's also some much more useful sites for examining the more well-known airfoil options, particularly those that are demonstrably more appropriate for the Reynolds numbers typical of the flow regime in which we operate. Here's one that's much more searchable if you know what you're after:http://www.worldofkrauss.com/foils/search
" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;
In the meantime, perhaps we should let this thread return to topic...