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How much spray coming off your trailing edge?

Posted: Wed Sep 20, 2017 6:46 pm
by Yodarocket31
Straight out of the box, my foil had minimal spray coming off the trailing edge. But the foil was noisy as hell.

After sanding and getting rid of the noise, I have noticed that there is now a ton of spray. It seems to travel up the trailing edge so much so that it shoots onto the underside of my board.

- What shape/sanding geometry affects the spray flying off a foil's trailing edge?

- On other foils, I see a range of spray patterns and quantities of water. Is there any connection between this phenomenon and the performance of the foil?

Re: How much spray coming off your trailing edge?

Posted: Wed Sep 20, 2017 10:36 pm
by BWD
Foils make you go up by making water go down, so a lot of spray coming up doesn't seem the most efficient phenomenon. The trailing edge of the mast is a low pressure area. It seems to me that if water flow around the wing and fuse to mast junction is feeding a lot of water into this area, that would contribute to the spray. Whether it is a net negative in overall performance compared to whatever changes you would have to make to stop it, is probably something you would have to determine by experimenting.
Curious, what did you sand? Wing, mast, or both?