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How much spray coming off your trailing edge?

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Yodarocket31
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Posts: 54
Joined: Thu Jul 02, 2015 1:01 am
Kiting since: 2014
Local Beach: Lake Tahoe, CA
Sherman Island, CA
Gear: North, Slingshot, F-One, Naish, Taaroa, Ride Engine
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How much spray coming off your trailing edge?

Postby Yodarocket31 » Wed Sep 20, 2017 6:46 pm

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?

BWD
Very Frequent Poster
Posts: 3139
Joined: Thu Jun 05, 2003 3:37 am

Re: How much spray coming off your trailing edge?

Postby BWD » Wed Sep 20, 2017 10:36 pm

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?


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