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Foil Board DIY

Forum for hydrofoil builders.


Benicia Wind
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Joined: Wed Jul 23, 2014 7:04 pm
Kiting since: 2009
Local Beach: Benicia CA USA
Favorite Beaches: Benicia CA USA
Style: strapless foil
Gear: DIY foil. NRG surfboard. Jimmy Lewis surfboard. Liquid Force One 12M. Slingshot Rally 9M.
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Location: Benicia, CA USA

Re: Foil Board DIY

Postby Benicia Wind » Wed Jun 21, 2017 9:37 pm

I recently built this board from 5 layers of 0.2" thick plywood from Home Despot. I routered out the 3 inner layers to help reduce weight but I left material in the center of the board to support the foil attachment area and the center of the board where I stand. It's about 10.5 lbs so still on the heavy side but not too bad. I stuck on 3M rubberized traction tape which I would not recommend for bare feet.
board.jpg

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tegirinenashi
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Local Beach: 3rd Ave
Gear: Cabrinha CO2 9.5m, Naish x2 14m, Litewave 161
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Re: Foil Board DIY

Postby tegirinenashi » Wed Jun 21, 2017 10:47 pm

The weight is pretty respectable, especially for plywood from home depot. For comparison, LF rocket is 12.5 lbs. Their excuse might be slightly bigger size, sliding plate mount and combination of inline and V inserts.

TomW
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Joined: Wed Oct 05, 2005 6:43 pm
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Local Beach: Vejbystrand
Gear: Homemade 4-1
North Mono 7 & 12
RRD Obsession 9
Core XR3 12m
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Location: Sweden

Re: Foil Board DIY

Postby TomW » Sun Jun 25, 2017 3:32 pm

I've glassed the bottom on mine....
2017-06-24 15.39.07.jpg

Jyoder
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Gear: Stringy Foil and DIY board
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Re: Foil Board DIY

Postby Jyoder » Fri Jul 21, 2017 1:02 pm

I made mine from 1/2in Baltic birch and cheap Home Depot Bondo poly resin and fiberglass cloth. The deck pad is a $6 roll of adhesive backed cork which is holding up surprisingly well. 10 lbs.

A fellow kiter recently broke a similar board at the front of the mast plate and I'm thinking of making another with 2 layers by the plate to be safe.

Here's a question. How important is it to have the bottom of he board be flat-ish like a regular kiteboard? What if I put a couple external 1-inch high stringers along the bottom of the board to make strong T-beam joints? Since you don't edge a foilboard when riding the board on the water, it might work right?
Attachments
IMG_0008.JPG

Jyoder
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Joined: Thu Jul 20, 2017 8:31 pm
Kiting since: 2016
Gear: Stringy Foil and DIY board
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Re: Foil Board DIY

Postby Jyoder » Fri Jul 21, 2017 1:44 pm

Something like this?
Attachments
IMG_0194.JPG

BWD
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Re: Foil Board DIY

Postby BWD » Fri Jul 21, 2017 3:41 pm

The picture above with tall stringers sticking down might be too grabby and make the board hard to steer on surface and cause problems on touchdown transitions. I would go with 1x6 glued flat to the bottom, with the edges fully beveled so it has a trapezoid cross section. This would be less grabby but still stiff.

TomW
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Posts: 1882
Joined: Wed Oct 05, 2005 6:43 pm
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Local Beach: Vejbystrand
Gear: Homemade 4-1
North Mono 7 & 12
RRD Obsession 9
Core XR3 12m
Brand Affiliation: None
Location: Sweden

Re: Foil Board DIY

Postby TomW » Tue Jul 25, 2017 10:35 pm

I'd glue another layer of ply, as wide as the plate, onto the bottom, from tail to nose, bevel the longitudinal edges, then bolt plate through both ply layers.

Problem is weight.


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