Just for clarity, looking back over this thread there's two different designs being discussed. One is Greenough's edgeboard w/ chine rails but also a radically stepped triplane bottom with a definite raised, vertical edge inset from the rails. The other is simpler triplane bottom. The Rasta interview bit I posted above is referring to ghe stepped, GG edgeboard.
I haven't tried an GG style edge board, but my impression on the way the rails are designed fit with what Rastavich says about the way the ride. Greenough talks about it in the Surfer's Journal or surfing mag article about the boards he made and let Dave ride. The board is designed to go very fast until you turn, then it's like putting brakes on. The other thing is the board was originally made for wind surfing.
What Rasta is riding now is more like adding hard edges to a bonzer like bottom, where the water is channeled into a narrower section that gets wider as it exits out the tail.
I think the best thing I've read about surfboard design goes to Bob Simmons saying that we really are just riding the rails. You don't want the rails to be brakes.
sharkcountry wrote: What Rasta is riding now is more like adding hard edges to a bonzer like bottom, where the water is channeled into a narrower section that gets wider as it exits out the tail.
Thanks for the input everyone. I think I've made up my mind...