Boards for eFoil

Sure thing, share away. I would upload them to the forum but it wouldn’t let me upload in PDF. I also have a 3d model in fusion 360 if that is any use to you.

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Use a free upload service. Fusion 360 would be great too.

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Hi Max. Sorry for the late reply, been really busy this week. Here are the templates and Fusion 360 file if you still want them. The 3D model is very basic, as I am shaping from the templates I only made it in 3D to roughly work out the volume. I didn’t bother adding rails etc as I am shaping them by hand. Hydrofoil Board - Google Drive
Started making some progress.

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That looks really nice. Will you float on it? Is your deck curved or flat? I think that curved might be stronger.

Thanks. Will still probably have to start lying down and then stand up when I get some speed up, I am close to 90kg but someone lighter may be able to start standing on it. The deck is curved (about 30mm), would have liked it to be more curved but I was limited by the thickness of the polystyrene sheets. Cheers

as its my day job If I can be of help in creating a cad file on shape 3d and the g code for people to cut it on there cnc for personal use I have a full licence for shape3d which is a board shaping software I’m happy to do draw up a basic design and file that people can down load.

bellow is just a example of what I normally cut

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That is very nice! I have a question. How do you line up the blank when you flip it over to machine the other side?

I have a center line machined down the table and then just a line on each end of the blank.

What are the consequences of using a larger board? I have an old windsurfer I am considering using. I assume greater stability but also greater drag until airborne. Or perhaps there is less drag because of increased buoyancy? Increased weight. Anything else?

I wonder myself. Since foiling is a physical challenge on its own, I want to make it easy to learn.

probably the biggest thing is swing weigh, having a smaller lighter board means it is easier and faster to react, the odious benefits of less to have to lift. Having a bit of width will also hep a lot when you make a unscheduled landing and offer a bit of stability when taking off or going at sub foiling speeds.

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Another factor in the volume consideration is if you have to paddle back to shore in the event of no power.

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This is such a great place for the DIY. My project started from scratch in August with building my board.My idea was to create a hollow medium sized wooden surfboard. First goal was to float👍.

As you can see, my mast was pretty amateur and the foil the same. I’m currently reworking the mast- I will post when I have it updated.

I was pretty happy with outcome of the board- sealed it with teak oil and then marine spar urethane. I tried the board/ foil in early September as a tow behind the boat before the boat was put away for the summer. I believe the mast was my downfall - I could stand up on the board but no matter how how far back I was on the board, it would nose dive with slight increase in speed. I believe I had too much drag on the mast. I’m also improving the foil now that I’m finding more information out there to go on. I have a video on the water- just can’t upload.

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@Dave, Hopeing this will help, if it does, see more videos on youtube from Delta Hydrofoil Pro Tip. :smile:


Good work tho…

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So the guy in the video confirms my theory in the „lets make the optimum wing first” thread. In the first 2min he explains how the kite creates a large moment. We don’t have that moment with the motor pushing close to the wing. So we probably all should modify our back wing for less downforce.

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Oh definitely helps - thanks for the response and video link.

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Hi just thought i would start to post after following this site for a while. Below is a pic of a board and foil , the board is am old SUP with high density foam layed in for the mount and it’s my second wing the first failed in the fuselage, we live and learn.

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today i‘ve planned an cut out a prototyp in the size of 30% from the original. the final one has a size of 160cm65cm13cm, so i think i have enough volume.

I completed the first of at least 4 lamination cycles. The bottom is far from smooth, but should be very strong. My vacuum bag ripped, so I couldn’t apply enough pressure to keep it flat. It will probably remain uneven. Hopefully the top will be smoother!

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Progress on the board so far. Now ready for glassing. Going to use 2 layers 6oz glass top and bottom with an extra 6oz patch where the foil goes. Didn’t have a hot wire cutter so I had to block sand the entire bank.

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