When I took my boat to storage, I looked around at a few others and considered how much tracking fin and rudder shapes have evolved over the last several years. Conversely, the shape of the fins on our skis has changed very little. In the 80s, I tested a bunch of different shaped fins for EP and we never really found an improvement over their standard "modified D" shape. Around that time, Connelly shipped their skis with the "tournament fin". After my first set on a new Connelly, I always replaced that thing with a standard fin, with great improvement in performance (and they sent me a stock of the "regular" fins and metal, rather than plastic, wings that were a significantly different shape). Others have come up with fin designs over the years (remember EP's tubular wing? cutouts on the trailing edge? the flat-bottomed Maha and Saucier fins way back when, and, of course, carbon fins, but we're talking shape, not materials here), but nothing seems to be an improvement that gets adopted.
Anyway, my question is, is there performance to be unlocked with new fin shapes? Maybe something really radical like the keels of America's Cup boats? We spend so much time tweaking our existing fins to .001s of an inch, is there a more fundamental change that could be a significant improvement?