By the way I saw some of Japanese diver with a carbon fiber fin that had been cast into a concave shape (concave for the down kick obviously), in the Sharm WC. Can't imagine it working very well though, but looked interesting
Andy, how about sacrificing another fin for science? Cut out a large chunk in the middle in a v-shape and replace it with a flexible material, maybe reinforce the edges a little...Perhaps put a little split in there as well?
I'd do it if I had an extra fin
