FSI fin science

[krusher74]

Interesting read and products

http://finsciences.com/surfboard-fin-science/

[nomastomas]

The science is pretty interesting, and while I think some of it is applicable to surfcraft, my personal experience with the WaveGrinder was disappointing. This fin is pretty fast when paddling, and/or riding in a straight line. But not really noticeably (to me) faster than some of the fins I use. I found turning to be the problem. It made the board difficult to roll onto its rail. Instead, the board wanted to pivot around the fin in a horizontal plane. I set the fin in a board I was very familiar with as both a 2+1 and as a single-fin. Followed the direction for placement, and made a few adjustments. Bottom line, I didn't like the feel while turning, and didn't find the fin significantly faster than my favorites. Pix below are of the WaveGrinder in my (then) trusty 9-6 modern LB, my favorite 2+1 set-up (Yater Pivot) in the same board, and my favorite single-fin (Velzy Noserider). Both of the center-fins are (relatively) high-aspect, low rake designs, which I'm in complete agreement vis-a-vis drag reduction. I spoke with the WaveGrinder's designer, and he indicated that they had developed prototype side-bite fins (same design, but smaller 5"). He offered to send me a set, indicated that they are symmetrically foiled, and would therefore have to be set with no toe-in. I declined the offer, not having the resources to shape a board just to test fins which I already didn't have much faith in.

[krusher74]

Good to hear a real world review, thanks

[rodndtube]

I would be interested in some high aspect sidebites... but more along the line of 1-7/8 to 2-1/4 inches. The 5-incher would be good for a center fin test out for me.