I think it’s here
http://www.greypaddleboards.com/product/retro-fit-foil-mount/
sorry my mistake I will also add them to the hydrofoil page also to make it easier to find
How realistic would it be to have a quick release system like this? It would make transportation easier, just not sure how to keep the wires from moving to much. Or even a hinge system?
@Hiorth I see that you added a carbon plate on the bottom of the board too. What thickness was the carbon plate and did you epoxy the plate to the board. Any other details would be appreciated. Thanks for your help
This is how I mount it. The aluminium rails are only there to distibute the load. They will be epoxyed in with some fibreglass. The mast head is going to be mounted through holes inside the rails. There will be 10 holes in total, so 3 positions. I will not use the slots on the rails for anything, they are not very strong. I use through bolts andI only use them because I have them.
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We added a carbon plate with epoxy and one layer of fiberglass, and vacuum bagged it onto the board, this is probably a bit overkill but it holds up! If you build a board from scratch, a different approach would make sense.
But this is how we did the windsurfboard mount:
Carbon plate on the bottom. m6 threaded rods with big washers and nuts on each side of the board, these where glued and tightened before the glue was dry (not getting those out again!). Then we added some more glue/fiberglass to make sure there where no leaks. The foil is then mounted with nuts on the threaded rods coming out of the board. Not super clean, but it is super sturdy, and it will not fail. I looked at some double sided tape mount, but I do not think it will be strong enough in the long run (but I might be wrong) and I like to be on the safe side, would really suck to loose the entire propulsion unit 
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Thankyou for that @Hiorth. I am using an old windsurfer board too. I have cut it down to 6ft. What thickness carbon plate did you use on the bottom.
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The sticky foilmount seems quite sturdy…
What surprise me more is that the sufboard seems to hold too…
Even if they were not designed for it, it seems like the stringer make it strong enough to be used with a foil…
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The carbon plate is 3-4 mm thick.
It might work just fine, I just dont like the feeling of taping my precious propulsion unit to my board. I also belive that the strain put on a efoil-foil is greater than the strain put on a kite/surf foil due to the weight of the efoil-board (and the pushing force from the motor). But again, might just be that I´m overkilling the mount.
Cheers
Thanks @Hiorth I’m definitely going to follow your mounting system. I looked at the foilmount product too. There demonstrations are very impressive but at $269 AUD I thought it was a bit expensive for a $10 cutdown windsurfer board. I believe your mounting system idea is both cheap and strong. Thanks again for your help.
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you do need to be carful that the board is up to the sticky mounts, I have seen a few sup’s that have delaminated from them
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Yes that would be one of my concerns, thank you for Sharing.
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3M VHB tape is the stuff to look at for applications like this. Spreading the load and tapering out the stresses would tax the underlying laminations the least.
Need to find a good way to open and close a waterproof lid. Does any one know the name of these? Taken form a YouTube clip of lift foils board.
It’s a boat latch, (looks cool)
thanks @Clarin !
will use those to secure next lid on efoil.
also how not to mount a foil, did a super stupid mistake with catastrophic results. Notice how the glue does not stick to the brown plywood. Forgot to scratch it up before gluing…
Resin coated plywood is very difficult to glue. Wood glue is good enough for wood to wood joints btw.
looks like form ply which is designed for things not to stick to! If any one is interested I could probably sort some sort of forum offer on the foil mount insets I do so at least you guys have a simple good solid reliable option.