Hi, I’m about to glass board #1 and swaylocks has been a massive help in getting this far. I’ve checked out a lot of info regarding fin positioning for this sort of shape and it seems right down on the tail and by the rail is what goes. 2 inches up off the tail and 1.5 in off the rail looks right to my eye too, and I’m thinking of giving them about 0.5 inch toe-in but with 0 cant.
My board is 4’11" x 23" (at centre) x 2.75". Nose is 20.5" a foot down and tail is 21.5" a foot up and 17 across the tip of the tail (yep, I know it’s fat). Rails are high and bladey in the nose to 60/40 ish in middle and down in the last foot (I’m going to experiment with hard edges with resin). The bottom is quite a pronounced hull in front, to flat out the back.
The keels are 10" base and 5.25 tall with about an inch of rake and single foil.
Does all this seem about right, any suggested changes/insight/advice/anything regarding either fin shape, but more particularly positioning?
1/2" toe sounds like to much,try 0" to 1/4" toe and 0 to 8 degrees cant depending on how well you want it to turn vs drive down the line.If it were mine I would place the trailing edge of the fin 4 3/4" from the tail and 1 1/4" from the rail.Toe in 1/8" and 4 degrees cant.This will also allow you to Quad fin it later palcing the trailing edge of the front fins at 10 3/8" and giving them the same distance from rail,toe and cant as the rear fins.Maybe some one with more knowledge will chime in though,this is just what works for me on my boards.
Thanks jesus, that’s given me something to think about. Do keel fins generally have less toe in than more standard fins because of the length of the keel? I’ve never had a board with keels before and it seems a bit different. I think I misused the term rake; I meant the top trailing edge of the fin overhangs by about an inch.
Hmmm, I think I’ve been measuring toe in the wrong way. Treating the 10 inch long keel as the radius of a circle, 4 degrees would make the leading edge of the keel 0.7 inches closer to the stringer than the trailing edge.
But it seems that when you measure the toe in in inches you assume a 4.5 inch base? A little confused about this because some of the angles I’ve read would give much more toe, in inches, than the inch measurements going around.
