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cutouts wingfoil boards

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francis luengo
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cutouts wingfoil boards

Postby francis luengo » Mon Nov 15, 2021 6:32 pm

Can anyone explain how the cut-outs work and if they really are efficient?
There are theories that flat stern are faster to take of.
thxs

StellaBlu
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Re: cutouts wingfoil boards

Postby StellaBlu » Mon Nov 15, 2021 7:02 pm

The theory behind a tail cutout is that you can "ollie" up onto foil or improve pumping efficiency with the incremental clearance in the tail.

The newer thinking is that any incremental takeoff gain from the tail cutout (not clear if there was actually any gain to begin with) is more than offset by the reduced speed achieved by shortening the effective running length of the board's hull. The new school of thought is to maximize running length so you can get the board up to speed, thereby creating lift to get you onto the foil. The other factor is that some tail kick designs create dirty flow and drag, further reducing speed, while a clean cutoff on the tail minimizes that drag.

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omg
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Re: cutouts wingfoil boards

Postby omg » Mon Nov 15, 2021 7:15 pm

Newest board from KT, quite a bit different from other ones.

Image

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Re: cutouts wingfoil boards

Postby StellaBlu » Mon Nov 15, 2021 7:19 pm

omg wrote:
Mon Nov 15, 2021 7:15 pm
Newest board from KT, quite a bit different from other ones.

Image
The odd thing is that the BRM guys have been riding some really nice looking unreleased KT wing boards with a much more conventional shape. Very clean design with no kick tail, no dramatic hull features, no gimmicks. I was kind of hoping KT would just release THAT board. Maybe this thing is great, but there's just a LOT going on and it feels gimmicky.

I think this board is trying to minimize the "thickness" between the foil mount tracks and the deck of the board. Other boards accomplish a similar feat by scooping the deck, which preserves clean flow over the hull.

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Re: cutouts wingfoil boards

Postby windmaker » Tue Nov 16, 2021 3:59 am

All those steps and cuts look like marketing gimmicks to me but I guess some people like that. Question is, If they really make a difference why wouldn't KT (and others) use these shapes on their surfboards/windsurf/kitefoil boards? The answer is they did... many years ago but have now evolved to the simple clean shapes we all know.
In my case, simple is better.


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