Duotone Wing & Foiling Tech Talks - Foil Position, Trim & Shims 

Thanks, happy that it helps you! You're right, it's a fine line between lower drag and being too pitch sensitive when reducing angle on the stabilizer. You can be faster with more angle / a more draggy system because of better control and the ability to push harder. Of course it also depends on your riding level what's best for you personally. Better riders can get away with a more nervous setup and enjoy the extra turning it offers them. Lower level riders will be better off with a more stable system to unlock their best. Cheers, Klaas

Hi, yes a negative shim could help you in that case, definitely worth trying it and check if it solves the problem you are having. One adverse effect from using a negative shim though, could be that your setup becomes too pitch sensitive. If that is the case, you might want to try a smaller size stabilizer without any shims. Lastly it could also be that the foil you are using is too big and generating too much lift once on a wave. If you give me you exact setup description and your weight, I might be able to have a more accurate tuning solution to your problem.

@@BonieuxJerome Thank you in advance for your availability but I just needed to understand how the shims work in the waves. Sometimes I find myself in the situation I described above and moving the mast is an increasingly delicate operation.

Good point! We should have specified that in the video ;)

If your front foot pressure doesn't stay similar if you change speeds (accelerate), but pushes your front foot up more and more and you have to bring your weight forward the faster you go, then you might want to try decreasing your angle of your stab with the use of a negative shim to keep it more balanced throughout the different speeds you're riding. Some riders prefer to have the "safety" of the front foot pressure building up, as it's usually more controlled at high speeds to have a bit of front foot pressure to push into. Play around to see what's actually faster for you and your level of riding. Hope this helps!

All front wings will generate more lift as speed increases IF the fuselage stay at exactly the same angle of attack. Remember that we have not only the front wing generating lift upwards but also the stabiliser which is generating an opposite force and thus subtracting lift from the front wing as speed increases. We explain that in more details in our other video "foil basics" ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-b_bL2ksu_kA.html