Tim Stamps just sent me these photos of yet another board he's been commissioned to build for the Stock SUP Class (12'6" and under, no rudder). I don't know what fast is (I'm one of the slowest guys out there) but I know Tim's got some ideas and they seem to equate to clean and quick. Evidently somebody out there agrees. Check out the latest creation to come out of the Stamps Board Works.
There's a pretty obvious design difference between the Californian and Hawaiian race boards. If you check out the shapes of boards like the C4 Vortice, the SIC F-16 and others you'll see how much more rocker they've incorporated into the front sections of their boards.
I'm sure it has to do with the type of water the Hawaiians are paddling in- their downwinders include pretty steep chop and open ocean swells. I don't think we're encountering the same conditions here in California. The boards I've seen (Eaton, Richmond, Bark, Mueller, Stamps) have all had really low rocker, low rocker is faster but only if there's limited chop and swell- I think.
Anybody care to chime in regarding design differences?