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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Tue Dec 24, 2013 5:00 am 
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Any long M10 sizes? M5s are ok for foot straps.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Tue Dec 24, 2013 10:34 pm 
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Location: Chile/Brasil
Just finished my keel.
Final Specs before glassing
910mm long
138mm chord
24mm thick
Very sturdy almost no torsión.
I made a tenon as sugested by Hawaiis.
Tenon is 15mm thich and the chord of the tenon is 120mm the depth is 52mm
Probably i will make the keel v2 with the tenon specs to get less drag.
Thanks to Zfennel for taking the time to give me more information on the torsión simulation.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Tue Dec 24, 2013 10:54 pm 
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Location: Chile/Brasil
25 hours logged on the building!
now i need to do the mortise on the fuselaje and finish the alignment.
probably i will work tommorow!!
happy holida :thumb: ys!!


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Tue Dec 24, 2013 11:24 pm 
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Location: Chile/Brasil
Hello Zfennel,
You were right on the money!!
I weigh 68 kilos and did the flex test!!
it deflected less than 10mm.
i will add a 1 layer 6 oz. carbón in 45° and a layer of 5 0z. glass in 0/90 to protect carbón.
that way it will flex very Little.
will add reinforcements on the tenon and on the connection with the board.
what do you guys think?
Pedro


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Wed Dec 25, 2013 1:17 am 
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Did you try the twist test ?


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Wed Dec 25, 2013 1:33 pm 
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Yes
i hold it on a vice and twisted with a gripvice on the other end.
it did flex but i coudnt measure.
probably some 6mm
after glassin and carbón i will do the test


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Wed Dec 25, 2013 8:54 pm 
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In that case, it might work better than I expected.
Good work.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Thu Dec 26, 2013 2:14 am 
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Today it felt i didnt advance too much.
I did all the jigs for the kell and fuselaje connection and the base plate for the board and keel connection.
it took me a while to figure out how to cut a mortise with the tools i had and make the fitting very snug.
Dont have a clue to how much base is necesary.
Can anyone give a good dimmension.
Im using a 210mm longx 85mm wide x30mm thick.
Is this enough?
i will insert 10mm into the board and glue it with epoxy and fiberglass.
That way i can make a sándwich locking the keel between the the insert and a top plate.
took me 5 hours to do all this.
29 hours logged!
what takes the most time is figuring out what method to use.
after the jig is done everything flyes! :thumb:
Pedro


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Thu Dec 26, 2013 11:19 am 
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windfreak74 wrote:
Im using a 210mm longx 85mm wide x30mm thick.
Is this enough

That is about right, more pictures please.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Thu Dec 26, 2013 4:48 pm 
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Location: rhode island
hi pedro,
i'm sure there are a few ways to secure the top and bottom of your keel.
but considering the amount of time you've invested so far, i would make some trial pieces out of scrape wood before cutting up the good stuff.
-bill

probably the one downside to wood is that the best joints typically need a lot of surface area and length to transfer significant loads from piece to peice.

with aluminum a single weld can do the job.
with composites, allowing the fibers to span the joints with a large fillet is usually enough,

since your bamboo is now carrying most of the loads, you'll need to allow space to reinforce the 90 deg alignment between the board and strut.
big gussets/fillets below the board.
or
a reinforced slot like a tuttle box that goes the full thickness of your board.

-bill


windfreak74 wrote:
Today it felt i didnt advance too much.
I did all the jigs for the kell and fuselaje connection and the base plate for the board and keel connection.
it took me a while to figure out how to cut a mortise with the tools i had and make the fitting very snug.
Dont have a clue to how much base is necesary.
Can anyone give a good dimmension.
Im using a 210mm longx 85mm wide x30mm thick.
Is this enough?
i will insert 10mm into the board and glue it with epoxy and fiberglass.
That way i can make a sándwich locking the keel between the the insert and a top plate.
took me 5 hours to do all this.
29 hours logged!
what takes the most time is figuring out what method to use.
after the jig is done everything flyes! :thumb:
Pedro


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