FAR 103 presents some interesting challenges to a designer; I am toying with an ultralight design and have always thought the low stall speed requirement woiuld be better met with a wing with a very high Cl operating at a relatively high (for an UL) wing loading rather than the usual (abominable excuse for an) airfoil used on most UL's and a large wing area. A smaller wing means bending moment, less structure; smaller chord and span means smaller tail volume and/or shorter fuselage all of which helps with weight.
Since we have no need for high speed flight it would seem one could capitalise on the other end of the spectrum by using a very high lift airfoil, something that would look like an airliner's wing with everything hanging out (though everything would be fixed of course, not retractable). Or like some of the early German Goettingen glider airfoils with huge amounts of camber.
Does anyone have any sources for data on very high lift airfoils?