SURFFOILS wrote:Previously I had used twin lateral foils with an overall length of 30 inches and now I was riding a single foil 13 in wide X 23 inches long. 3mm flat plate Aluminium.
Hvave I bored everyone to death yet ??
SURFFOILS wrote:Thanks for the comments guys.
With the twin foils I did play around with AOA all the time as well as setting them at different heights so the front foil didn't create turbulence for the trailing foil, but now with a single foil there's no AOA , just parrallel to the hull, it makes it easier to know the angle of the foil, if its exactly the same as the board angle.
Some of the foils are bidirectional, some are single direction where Ive tried to work out if a tapered outline would be better.
The wood foil below, ( at 6 o'clock) is a design that gives a reduced nose area for soft turns with an increasing width and concave at the tail for more stability and grip off the back foot.
The Blue foil to the left has a wider nose and then splits into a swallow tail configuration that gives stability without stiffness, I know I can push into turns and have it slide when I want.
Instead of doing a series of foils with varying outlines and then degrees of dihedral or anhedral, Ive focused on one element at a time and then worked out the best combination of elements.
With the Yellow foil in the middle Ive split the planing surfaces into 3 areas over 2 levels... there's the 2 side arms that give balance and the higher central area that gives greater area at low speeds but lifts out of the water at greater speeds leaving just the side arms submerged. This foil is great for fast acceleration in the surf and for wake boarding.
There's so many aspects to foil design but a long time ago I learnt that simplicity works best in the water, sure you could create a massively complex beast but every control surface is a drag surface so for the sake of efficienct design, simplicity is best.
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