Just wondering how flex is put into a flex fin, is it the thickness toward the tip, overall thickness or is it done in the lamination? Holger
Just wondering how flex is put into a flex fin, is it the thickness toward > the tip, overall thickness or is it done in the lamination? Holger It’s done with a lot of grinding and sanding.The best material to use, that I know of,is volan cloth.lay up a panel at 3/8" thick.When cured,cut out your template then scribe a line down the center of the leading and trailing edge.Start grinding on one side starting at the trailing edge working you way towards the leading edge.Try to do both sides as evenly as possible-hence the scribe line-and don’t even worry about foiling the leading edge until the last thing.The key is to grind and sand on the rest of the fin unti you get the desired thickness and flex, then use a rat tail fil to foil the leading edge,then fine sand the whole works.the thicknes will be along the leading edge and base area with the fin gradually thinning out as you move towards the trailing edge and tip area.Much like an airplane wing the thickest part5 is going to be at the base/trailing edge junction and gradually foiling itself out to the thinnest part which is at the trailing edge/tip junction.Kinda basic explanation,but I hope it helps.A few of us keep some sand paper and file in our surf bag so we can fine tune the flex on the beach during a surf.