Keen to learn more about tails. Tail/Hydrodynamics Gurus Please help!
I personally have a UNIfoil 18" Race tail, bought with my new foil on the advice that its a good starting point to chop down to as low as 11.5".
Before I chop anything I want to educate myself on what shape to use!
I’ve done some interesting reading on wing design (mostly aerofoil based from planes) but the collective knowledge on here is worth a lot, as we’re not just talking theory but adding experience and feel in to the mix aswell.
From my reading the eliptical wing “like spitfires” is a very efficient design partly due to reduction in tip vortecies.
Interestingly though, the Unifoil race tails are very square in plan shape, and few tails are using this eliptical design, despite the theoretical benefits.
Is it because the tails are becoming extremely thin in profile that they can get away with these shapes with minimal losses?
Is it true that the thinner a profile the less vortecy will be formed due to lower pressure differences ,top to bottom, as thinner by defult means closer to a symmetrical profile?
Is it common to make the wingtips’ foil more, or completely, symmetrical in order to reduce pressure difference at the tip? Does this work, in effect, as a horizontal winglet? I was trying to work out if this is what they had done with spitfire wings but online resources didn’t help much!
Can anyone explain how you’ve cut and foiled your tails and what your results were?!
I’m a design engineer and toolmaker, foiling has made me find this very interesting. Makes me want to retrain in hydro/aerodynamics!