I didn't have much email correspondence with Greg, however that design was covered. That would be a Griffin implementation of the "Inverted V" design. Which I consider to be a "panel concave", although a key difference is that Greg described the modern shortboar concave as "cup shaped" whereas that has Greg's philosophy of "flaring outwards". As I learned from this forum Greg was not at all keen on the idea of cupping water!Randomly ran across this pic on the interwebs and I don’t remember GG posting about it before. Anyone know the story on this bottom? Miss his posts and stories.
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He sent me pic of a Matt Kazuma Kinoshita inverted V gun and that took the panel all the way up to the edge at least as far as in front of the fins, whereas Greg's version above looks like the V panel only reaches the rail at the wing. According to the correspondence these Kazuma inverted V guns were trusted tow boards at Jaws in the early 90s.
Inverted V came out of the T&C factory and Greg said it was an evolution of the early Brewer concaves (which were not cup shaped).
I think we can safely believe that Greg ultimately settled for the flat bottom, but he has tried other designs I've never been to the North Shore, but its interesting.