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ideas needed to mount hydrofoil to board

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ChristoffM
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Joined: Tue Jul 19, 2011 5:26 pm
Kiting since: 2005
Local Beach: Langebaan and Cape Town.
Favorite Beaches: Anywhere in the Cape, South Africa.
Style: Hydrofoils! (And surf and old school)
Gear: Cape Town Foilboard and Spotz hydrofoils.
Any kite that can keep up with the hydrofoils.
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ideas needed to mount hydrofoil to board

Postby ChristoffM » Fri Jun 01, 2012 6:23 pm

I made a hydrofoil out of plywood and fiberglass. The keel part is nice rigid aluminium extrusion. Now I need to tie the hydrofoil to the kiteboard in such a way that it can be assembled/disassembled for transport.

My first try was to epoxy the extrusion into a 1.5inch thick block of wood, and reinforce with fiberglass. I hen bolted the block of wood to the board. This worked well structurally, but the water drag is way too much. I thought it would not matter since the board lifts off the water, but getting the board going fast enough so that the foil can lift is proving difficult.

The board is only about 2inch thick. I was thinking of putting tuttlebox insets into the board, and tying the hydrofoil on like a fin. But I do not know if this would be strong enough, and I cannot get any tuttlebox inserts in South Africa. So now I wonder whether it is possible to cast my own mold using resin.

Does anyone have any ideas?

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ChristoffM
Medium Poster
Posts: 196
Joined: Tue Jul 19, 2011 5:26 pm
Kiting since: 2005
Local Beach: Langebaan and Cape Town.
Favorite Beaches: Anywhere in the Cape, South Africa.
Style: Hydrofoils! (And surf and old school)
Gear: Cape Town Foilboard and Spotz hydrofoils.
Any kite that can keep up with the hydrofoils.
Brand Affiliation: Cape Town Foilboards
Location: Langebaan (Cape Town)
Contact:

Re: ideas needed to mount hydrofoil to board

Postby ChristoffM » Fri Jun 01, 2012 6:31 pm

Here's a picture of what I have now:

hydrofoils.jpeg

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edt
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Re: ideas needed to mount hydrofoil to board

Postby edt » Fri Jun 01, 2012 6:47 pm

mount that wood on top of your board, right? Of course you have to cut a slit thru the board and finish it however you are finishing your board and make an extra attachment so you can unbolt or bolt through the keel to your block of wood. where did you buy the keel from, btw.

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ChristoffM
Medium Poster
Posts: 196
Joined: Tue Jul 19, 2011 5:26 pm
Kiting since: 2005
Local Beach: Langebaan and Cape Town.
Favorite Beaches: Anywhere in the Cape, South Africa.
Style: Hydrofoils! (And surf and old school)
Gear: Cape Town Foilboard and Spotz hydrofoils.
Any kite that can keep up with the hydrofoils.
Brand Affiliation: Cape Town Foilboards
Location: Langebaan (Cape Town)
Contact:

Re: ideas needed to mount hydrofoil to board

Postby ChristoffM » Sat Jun 02, 2012 8:10 am

Top of the board would be difficult. That is where my rear foot goes, and I don't know how I will connect the wood to the keel in a removable way.

The keel is an extrusion off cut I found. The people that do alluminium extrusions in this country has a nice airfoil mold to make 1000's of meters of this extrusions, but the minimum order quantity is huge. Next time I will try using air foiled hang glider down tubes. They might need one layer of fiberglass to stiffen them up slightly.

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cookiemonster
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Favorite Beaches: Same as Local Beach!
Gear: flys with Flysurfer Speed2 15 SA, PsychoIV 8 & 12, Pulse1 5m
on homemade hydrofoil & SeaThrough boards 128/37 & 139/42 & wave 165/44
Inside my cupboard: surf Airush Converse 6'3 - Nobile Shinn Pro
Brand Affiliation: www.SeaThroughBoards.com of course
Location: Cork - Rep. Of Ireland
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Re: ideas needed to mount hydrofoil to board

Postby cookiemonster » Sat Jun 02, 2012 10:19 am

Did you try to profile the piece of wood fixed under the board?

Image

that should reduce the drag enough.
After you'll have to play with the angles on front/rear wings to get the correct lift

User avatar
ChristoffM
Medium Poster
Posts: 196
Joined: Tue Jul 19, 2011 5:26 pm
Kiting since: 2005
Local Beach: Langebaan and Cape Town.
Favorite Beaches: Anywhere in the Cape, South Africa.
Style: Hydrofoils! (And surf and old school)
Gear: Cape Town Foilboard and Spotz hydrofoils.
Any kite that can keep up with the hydrofoils.
Brand Affiliation: Cape Town Foilboards
Location: Langebaan (Cape Town)
Contact:

Re: ideas needed to mount hydrofoil to board

Postby ChristoffM » Sat Jun 02, 2012 4:25 pm

No, I did not streamline the first one. (I did not think it important then). Maybe that is the easiest route to go. Thanks.

wil
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Re: ideas needed to mount hydrofoil to board

Postby wil » Wed Dec 10, 2014 3:12 am

hi I see you are using a North 2010 race board. Have you made anymore progress with bolting your foil to the board. Can you show both sides of the board. I am planning to buy a North 2010 raceboard and attach a hydrofoil.


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