I'm having a custom SUP Foil board shaped and am wondering what others thoughts are regarding concave or bottom contours? There's speculation with some that seems to make sense that concave helps create lift/ assist in easier release/less stickiness of the board in getting up on foil. In looking around at different shapes- they seem to run the gamut from dead flat to single concave, single to double, channels... all kinds.

When in doubt I always tend toward the simple solution. My shaper's previous iterations have been pretty flat- seemed to release pretty easy w/ a demo, but I'm considering a subtle single concave.

Anyone? Mahalo in advance.

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Holoholo said..
I'm having a custom SUP Foil board shaped and am wondering what others thoughts are regarding concave or bottom contours? There's speculation with some that seems to make sense that concave helps create lift/ assist in easier release/less stickiness of the board in getting up on foil. In looking around at different shapes- they seem to run the gamut from dead flat to single concave, single to double, channels... all kinds.

When in doubt I always tend toward the simple solution. My shaper's previous iterations have been pretty flat- seemed to release pretty easy w/ a demo, but I'm considering a subtle single concave.

Anyone? Mahalo in advance.

I personally don't think concave is useful for foil boards.....

I'm making my prone boards dead flat with chines. Just to give water the shortest quickest route off the board when I paddle or touch down. It seems to make a difference as I've tried a few different things.....

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Holoholo said..
I'm having a custom SUP Foil board shaped and am wondering what others thoughts are regarding concave or bottom contours? There's speculation with some that seems to make sense that concave helps create lift/ assist in easier release/less stickiness of the board in getting up on foil. In looking around at different shapes- they seem to run the gamut from dead flat to single concave, single to double, channels... all kinds.

When in doubt I always tend toward the simple solution. My shaper's previous iterations have been pretty flat- seemed to release pretty easy w/ a demo, but I'm considering a subtle single concave.

Anyone? Mahalo in advance.

Know nothing about foiling as only done it for a few months and this is the only foil board I have ridden. But I hardly notice touchdowns and it pops up easily.
A lot of work here:

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Holoholo said..
I'm having a custom SUP Foil board shaped and am wondering what others thoughts are regarding concave or bottom contours? There's speculation with some that seems to make sense that concave helps create lift/ assist in easier release/less stickiness of the board in getting up on foil. In looking around at different shapes- they seem to run the gamut from dead flat to single concave, single to double, channels... all kinds.

When in doubt I always tend toward the simple solution. My shaper's previous iterations have been pretty flat- seemed to release pretty easy w/ a demo, but I'm considering a subtle single concave.

Anyone? Mahalo in advance.

G'day Holoholo when it comes to Foil boards whether it's a SUP Foil or Prone Foil, Truly all you want is a Foil Board with NO EDGES, but with volume to suit your weight only with Soft Rounded Edges and a Displacement Hull with no rocker and a little Nose Lift.

With a Displacement Hull (grab two magnets put the two positive ends together, they will not want to touch and the same with the two negative ends together they will not want to touch also) So when you are up foiling and you have a board with a Displacement Hull it will be the same when your foil touches the water it will release freely.

IF, you have concave or edges on a Foilboard when your Foilboard touches the water it will still like glue ( put a negative magnet and positive magnet together ) Do you concur.

When wanting concave only use them when it comes to surfing on a wave with a normal thruster surfboard or high-performance surfing SUP. I LOVE concave in my normal thruster surfboards that has as much rocker like a banana AND when it comes to Twin-Fins the more Vee in the tail the better.

Have Fun see Ya In The Water.

Right on- thanks much for the input. Helps confirm my thoughts a bit. Definitely I have to reimagine/reboot/avoid habitual surfboard thinking.

Board is cut- going to scrub'er today. Really flat for rocker, beveled rails, smooth transitions/no hard edges, lifted at nose, tail kick/beveled just aft of the boxes to clear tail for pumping. Bottom is dead flat at tracks. Also going with a slight concave/recessed deck. 6-0x28 115ishLs carbon layup. Trying for super light.

Guess we'll see how she goes soon!

ive gone the opposite and done vee nose 5'7"x 24 no idea on liters hand shaped hope i can stand on it

24 wide is closer to a prone board for me being around 6-3 200 / 90 kilos / 190cm. Tried a friends 6-0x26 wide and had heaps of fun... but started to have to work hard after wind came up and it got choppy.

I did this post because- I'm speaking from much ignorance regarding the foil game- anything I know comes from other paddling/ surfing craft, but... V can definitely affect stability. Guess the magic is finding limits, the sweet spot in compromises for a shape that does everything asked of it: stable/paddles reasonably back out to line-up, paddles into a wave/releases/pops up, flies stable... touches down smoothly. Doing all that well is a hard ask- improving one thing can hurt another so one has to decide where to compromise.

Eh- easy to overthink this stuff though. Could probably do just fine- have fun with a real basic shape.

Do post a report when you get out on her!