[Fondueset]

I have been studying some of the pictures I have taken of fish and you can see the type of convex flex trux describes. The Rays along the outside of the fin support the edges - it also appears there is a bit more support toward the center - enough to make a little less convexity there - though still some. These fish also have a higher aspect ratio, of course - than a traditional monofin - but less than the lunocet or fish like tuna. It would be interesting to build a fin with a higher aspect - but with re-enforcement along the leading edges and material layered so that it would function as above. You would want it to go slightly convex - more toward the edge and not too much.