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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Nov 23, 2013 4:54 pm 
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The cord on the koa wood struts are100mm, thickness between 22mm to 24mm. They are stiffer than the MHL, the 22mm is not quite as stiff as Carafino. The 24mm is stronger than both. They are only sealed for water. I hate fiberglass.
Rush Randle, MHL and Carafino all have 20mm thickness. And I wonder why.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Nov 23, 2013 5:43 pm 
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Hawaiis wrote:
The cord on the koa wood struts are100mm, thickness between 22mm to 24mm. They are stiffer than the MHL, the 22mm is not quite as stiff as Carafino. The 24mm is stronger than both. They are only sealed for water. I hate fiberglass.
Rush Randle, MHL and Carafino all have 20mm thickness. And I wonder why.


Excellent.
Thanks.
Just to be clear. The 24mm strut is stronger or stiffer or both?
-bill


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Nov 23, 2013 8:29 pm 
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ronnie wrote:
The UA4085 louvre aluminium extrusion looks about right for a mast? 94mm chord and 10mm thick.
Australian company.

http://www.ullrich.co.nz/images/louvre_3.jpg


Nice find. Thanks!


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Nov 23, 2013 10:23 pm 
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don pitcher wrote:
ronnie wrote:
The UA4085 louvre aluminium extrusion looks about right for a mast? 94mm chord and 10mm thick.
Australian company.

http://www.ullrich.co.nz/images/louvre_3.jpg


Nice find. Thanks!


If I was going to use it I would expect to have to fill it with fibreglass though. There are figures for strength and stiffness of production struts which would allow comparison of the bare extrusion.

I don't know what the skin thickness is but they said the diagrams were true size, so you should be able to measure it.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sun Nov 24, 2013 5:44 am 
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Hawaiis wrote:
The cord on the koa wood struts are100mm, thickness between 22mm to 24mm. They are stiffer than the MHL, the 22mm is not quite as stiff as Carafino. The 24mm is stronger than both. They are only sealed for water. I hate fiberglass.
Rush Randle, MHL and Carafino all have 20mm thickness. And I wonder why.


Finally , i "Get it" !!

I won't be breaking any speed-limits on water , while i'm learning
to NOT do face-plants with a hydrofoil.

So the speed-penalty of the thicker wood strut Vs the carbon one ;
won't bother , me one little bit !!

Bille


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Nov 25, 2013 11:23 am 
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Testing only one Wood front wing Hydrofoil


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Nov 25, 2013 5:29 pm 
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I like the transparent wing!!


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Nov 25, 2013 5:36 pm 
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Is that plexiglas or lexan?


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Nov 25, 2013 6:37 pm 
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Laughingman wrote:
Is that plexiglas or lexan?

It is plexiglass that I have laying around in the house, size 1/4"x3"x14"
May be they should call it flexinglass. It is harder to ride due to its flex, but wouldn't it be cool if the strut is made out of invisible material, and it will look like you are flying on a magic carpet.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Nov 25, 2013 7:07 pm 
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That would be cool... maybe if you glassed lexan it would be stiff enough?


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