Members SkiJay Posted May 19, 2019 Author Members Share Posted May 19, 2019 DFT Insights @paul413ski & @Ed_Johnson, Thank you for sharing your experience with this simplified tuning method here. I'd like to expand on how DFT affects these setups. Since this method is guided by using the index marks to keep the fin "level" to orient the teeth with the water flow during acceleration, there are no LE-neutral DFT adjustments. All DFT changes move the fin's leading edge location (LE). So two ski behaviours change with each adjustment, yawning tip engagement and smear. Of the two behaviours, yawed tip engagement is most affected. The further forward LE moves, the more yawning tip engagement we get from our habitual skiing inputs—all good for increased speed and power until we've gone too far and the tip starts grabbing. But as DFT gets longer, smear also increases. So while the tip is getting more bite, the tail is also loosing some grip. This loss of tail support further increases exposure to tip-grab. Because of this dual behavioural effect, the search for the longest LE our technique can use will also need a little more fin area to control the increasing smear. Fortunately, FD changes affect smear over six times more than DFT changes do. So as you zero in on your max LE with DFT adjustments, you may want to throw in a few small LE-neutral fin area adjustments, where you reduce DFT by the same amount as your increase to fin area for a slight LE reduction (e.g. an increase of a 1/8 turn to fin area (FD & FL) would be accompanied by a 1/8 turn decrease in DFT). Link to comment Share on other sites More sharing options...
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