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lee1972 said...
Just a quick question about tri and quad fin boards. Ive heard there not that great for high wind and bump and jump so i was supised to see that JP's fsw is coming out with a tri fin set up, does anyone just use these board for messy, choppy conditions??
We´ve been doing a FSW trifin since 3 years which gets really good feedback. They are better at everything but top end speed at a broad reach. They can be used as single fins too but the few that give it a try come back quickly to trifin. With a trifin, it has a bigger windrange, better upwind, better top end control, better wave riding. You need to move the mast foot back for trifin mode to keep it riding free, forward for single fin to stop it from tailwalking too soon.
BUT, you can not compare our trifins to those of JP, Exocet or practically any other (The new Simmer FSW being an exception I believe). We have been developing trifins since 1997 and it´s not simply adding some fins. It was a customer from Dongara actually who got me to start testing with toe-in back in 2005 and it reduced drag and improved wave riding considerably. Now we have done extensive research with a university and have found a lot more to the influence of the board and it´s shape to the water flow underneath. Before that I already figured out that all 3 fins should have similar flex and profiles. No one would put to slicks + off road tires under the same car.
Trifins are in principle the best set-up, the difference with quads is not huge but there still is a fin less so less drag and there is a centre fin giving less drag and improving predictability and precision a little (all relative off course). But to make them turn well, they need relatively big side fins. And the bigger, the better they need to be set up.
Quads have 2 trailing fins already giving a lot of area so the side fins can be kept small and it´s less noticed if they are not set up well (read: paralel like they nearly all are). For this same reason most trifins have just really small side biters. I am still surprised that after 3 or 4 years of multifin boards, some shapers who are also surf board shapers, still do not use toe-in. It´s not just because of better turning but also because of speed. Especially speed DTL. When sailing upwind, the AoA is fairly big on all fins, without toe-in one a little more and the other a little less which balances it out for the most part. But when going DTL, without sideways force of the sail, the flow needs to go as smooth as possible over the fins. Without toe-in, to the water the fins are actually toe-ed out..... And that is only the beginning. These are not huge things, more fine tuning but that is where things should be by now. Still the 2012 boards we´ve seen this summer, none had any toe-in.
I´ve had feedback of various people from various countries who´ve also been riding other brands Quads. The differences are not big but every comment contained: faster on the wave, and most contained: turning tighter (only the Quatro KT turned as good). Most other aspects were more or less similar, depending on which board.
Time will tell.
Bouke