holden wrote:thanks, Rabidric, that's the keyword i was waiting for.
....
then i said to myself, f*** it, follow the very early idea of a retractable centreboad. can't be that tough to build. well and here it is....
more to come...
i call it raveboard.
Around 1990 I had a windsurf slalomboard with a bottomfinish similar to what you mention made by a local shaper. The board was very fast but I honestly think that had more to do with the overall shape than the finish but I unfortunately never polished the bottom and quantified any possible effect.tautologies wrote:Why does not anyone try to create a sandpaper-ish type surface under the board? If we add covered in tiny ‘V’ shaped ridges, known as dermal denticles that should reduce those small whirlpools right?
Look at the shape of a golfball...it is not smooth, yet the surface reduces drag by creating turbulence....wouldn't this be feasible on a race board too?
You pretty much want the board to cavitate...and then use the fins to completely control the board...I guess intuitively you might be able to create the same surface on fins too...
anyways...I really don't know what I am talking about...but it has been stuck in my head for a while....
./A
Well how about sharks..they have a rough type surface...it might have to do with them not being entirely straight, which we can have boards be. I think the idea is that by having that little irregular water movement between the board and the water we avoid getting major cavitation...SBBeachbum wrote: Around 1990 I had a windsurf slalomboard with a bottomfinish similar to what you mention made by a local shaper. The board was very fast but I honestly think that had more to do with the overall shape than the finish but I unfortunately never polished the bottom and quantified any possible effect.
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