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DIY Home Made wooden Hydrofoil fins

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windfreak74
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Re: DIY Home Made wooden Hydrofoil fins

Postby windfreak74 » Fri Dec 13, 2013 10:59 pm

hello Bill,
thanks for the tip!!
its a easy fix ! :D
thin bit, drill thru put another nut on top.
I get to work on it!
i wanted to be beautiful all Wood no bolts in sight! :cry:

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windfreak74
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Re: DIY Home Made wooden Hydrofoil fins

Postby windfreak74 » Wed Dec 18, 2013 12:12 am

Hello guys,
Got to finish half of the mast profile this weekend!
Couldnt finish the sanding but this is what i got
its 860mm long x 130 mm wide x 8mm thick.
My guess is mast foil will be somewere in the 19mm thick x 135mm chord.
there will be a 4 layer of 6 oz. fiber glass in the middle to bond both half to avoid shearing in the midlle due to flex. and avoid flex by puting fibers in 45° degree layup.
Please comment construction!
16 hours logged in!
Pedro
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BWD
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Re: DIY Home Made wooden Hydrofoil fins

Postby BWD » Wed Dec 18, 2013 12:19 am

Put the fiberglass on the outside wrapped around the mast. In the middle it doesn't do any good.

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windfreak74
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Re: DIY Home Made wooden Hydrofoil fins

Postby windfreak74 » Wed Dec 18, 2013 12:24 am

Thanks BWD!!
hows the cloud working for you?
I got one too! great lightwnd videos by the way!
:thumb:
Pedro

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windfreak74
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Re: DIY Home Made wooden Hydrofoil fins

Postby windfreak74 » Wed Dec 18, 2013 12:31 am

Hello BWD,
since you pitched in, here is a glassing question.
how many layers of 6 oz glass should i rap around?
zneffel? any comments?
how about carbón in 45°degrees to make it laterrally stiff?
to many questions not enough carbón!!! :(
what to do????
Pedro

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windfreak74
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Re: DIY Home Made wooden Hydrofoil fins

Postby windfreak74 » Wed Dec 18, 2013 12:36 am

hello zfennel,
composite newbie speaking!!! :baby:
can you comment layup?
sorry for my misspeling of your name:oops: !

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Re: DIY Home Made wooden Hydrofoil fins

Postby BWD » Wed Dec 18, 2013 4:29 am

OK, but I can only give a guess and I am not an engineer, so take this with a grain of salt.
I would go for at least 4 layers of 6oz in epoxy, 6 layers would be better but heavier.
With only 6oz fiberglass to work with, on top of a strong wood core, I would put all cloth on the bias, +/-45 degrees, because the torque is a bigger issue than lateral flex.
One more thing you could do to help the stiffness is to thicken the mast.
If it's made of left and right halves, a 3-4mm layer of wood veneer or marine plywood between them would add enough thickness to make it much stiffer, at a total thickness of about 26-28mm (19mm wood + 3-4mm ply + 2 x 2mm glass +1mm glue between layers).
It might not be as pretty though. This might be worth doing if you don't have carbon.
If you do have carbon, +/-45 degrees is the way to lay it.
2 6oz layers might be enough, 4 would be a lot, so maybe 3?
I think if you had a light (weak) wood or foam core, you would also want a similar amount of carbon to run at 0 degrees (vertical unidirectional).
Finally, if your wood is really strong, you probably would be ok with less glass.
That's the best I can do for now....
Good luck!

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Hawaiis
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Re: DIY Home Made wooden Hydrofoil fins

Postby Hawaiis » Wed Dec 18, 2013 5:21 am

Windfreak:
What kind of wood are you using?
Are you gluing 4 pieces together for the strut?
Mahalo

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windfreak74
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Re: DIY Home Made wooden Hydrofoil fins

Postby windfreak74 » Wed Dec 18, 2013 12:36 pm

Thanks BWD :thumb: !
very helpful.

Hello Hawaiis,
im using bamboo flooring. I glued 2 pieces by the tongue and groove connection.
that gives me a 192mm area x 15mm thick to route.
But i think that i will do it again with and glue 2 Wood florings together tyo get 30mm thick.
That way i can route a single piece of about 20mm before glassing.

hope this gets it clear!!
Pedro

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windfreak74
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Posts: 458
Joined: Tue Mar 23, 2010 1:16 am
Kiting since: 2006
Local Beach: curanipe,costa blanca, punta parron
Favorite Beaches: maule region
desembocadura biobio
Style: Freeride
Gear: best 12m Nemesis 2008
cloud 17m first edition
switch nytro 8m 2013
switch nytro v5 10m
skywalker 135 x48
ocean rodeo Mako 134x 35
underground speedboard 139x27
Manta foil
Brand Affiliation: None
Location: Chile/Brasil

Re: DIY Home Made wooden Hydrofoil fins

Postby windfreak74 » Wed Dec 18, 2013 12:42 pm

Hawayys,
Its 4 pieces together like you mentioned.
I will do this this weekend to advance a litlle more.
Ill leave th first piece as practice.
Mahalo!


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