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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Jan 27, 2014 2:46 pm 
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Joined: Wed Jul 10, 2013 1:12 pm
Posts: 45
Here is a picture of my current DIY wooden hydrofoil wing

Core is red oak (Home Depot)

Core root thickness is 7 mm
trailing edge almost paper thin
tips 1 mm
Airfoil shape Eppler 817 with a 50% reduced cord thickness
Core size
Wingspan 500 mm
Cord length at root 150 mm
Cord length at tip 50 mm



4 layers of Home Depot fiber glass on top
5 layers of Home Depot fiberglass on the bottom

Screw holes bored at 1/2 inch and filled with expoy / fiber mix to seal the wood core.

Finished wing has a solid 2 mm fiberglass edge
Wingspan 504 mm
Cord length at root 154 mm
Cord length at tip 54 mm

Much faster than stock MHL front wing. Maybe a little too much flex in the wing. Next version will have a layer of carbon uni top and bottom.


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1622144_10202943517015439_275071925_n.jpg
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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Jan 27, 2014 5:08 pm 
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Joined: Tue Dec 23, 2003 2:34 pm
Posts: 1428
Image
Image
Image

Some progress here.

carbon fun starts next week.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Jan 27, 2014 8:24 pm 
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Joined: Tue Mar 23, 2010 1:16 am
Posts: 308
Location: Chile/Brasil
my front wing is about 800 cm2
2 layers 5oz. fiberglass on top
2 layers 5 0z. fiberglass on bottom
It has 11 mm in the thickest part and 17 cms long
470 mm spam wise


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2014-01-27_16-11-59_112.jpg
2014-01-27_16-11-59_112.jpg [ 630.12 KIB | Viewed 696 times ]
2014-01-27_16-12-25_574.jpg
2014-01-27_16-12-25_574.jpg [ 896.04 KIB | Viewed 696 times ]
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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Wed Jan 29, 2014 5:30 pm 
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Joined: Tue Mar 23, 2010 1:16 am
Posts: 308
Location: Chile/Brasil
yesterday i ended the vaccum bagging on keel.
50 hours looged.
Pedro


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2014-01-28_22-30-30_485.jpg
2014-01-28_22-30-30_485.jpg [ 1.01 MIB | Viewed 596 times ]
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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Wed Jan 29, 2014 5:49 pm 
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Joined: Tue Dec 23, 2003 2:34 pm
Posts: 1428
windfreak74 wrote:
yesterday i ended the vaccum bagging on keel.
50 hours looged.
Pedro


Looking good.

how many layers of carbon over the core?

Thanks


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Wed Jan 29, 2014 6:08 pm 
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Joined: Tue Mar 23, 2010 1:16 am
Posts: 308
Location: Chile/Brasil
i did 1 layer of 6oz. in +-45 °
an will use a layer of 2 oz fiberglass in 0/90 to get a better finish on carbón.

i ended with keel at 24.5mm thick and 138mm long.
the keel will have an effective height from bottom of board to bottom of fuselaje of 870mm.
Cheers,
Pedro


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Thu Feb 06, 2014 7:29 pm 
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Joined: Tue Mar 23, 2010 1:16 am
Posts: 308
Location: Chile/Brasil
50 hours logged.
i keep going a little slow but im still on it!
vaccum bag did not tur out perfect but i lack the apropriate vaccum bagging supply.
the strut is ready for shaping and vaccum bagging.
Hope to have it done this month.
cheers,
Pedro


Attachments:
File comment: first big vaccum bag
2014-02-06_14-19-21_360.jpg
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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Feb 08, 2014 4:23 am 
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Joined: Tue Mar 23, 2010 1:16 am
Posts: 308
Location: Chile/Brasil
55 hours logged
final board position pointing up
final front adjustment on front wing
filling with epoxy for fuselaje to strut connetion.
center strut ended being 13 inches from the back of the board.
almost ready for maiden voyage!!


Attachments:
2014-02-07_22-15-44_669.jpg
2014-02-07_22-15-44_669.jpg [ 1.07 MIB | Viewed 307 times ]
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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Feb 08, 2014 10:32 am 
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Almost done, can't wait to see how it works.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Feb 08, 2014 2:16 pm 
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Joined: Tue Mar 23, 2010 1:16 am
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Location: Chile/Brasil
with 24.5 chord thickness i made the 3 point stress test on the keel after the final layup.
With 75 kilos in the midlle of the keel it deflected 3mm.
weight is 2.2 kilos at 24.5mm x 142mm x 870mm
i think is stiff as necesary.
what do you guys think?
ill start on a new keel with a thinner chord (16mm) and longer mast (920mm).
the idea is to make upper half in 24mm ans the lower half that goes inthe wáter tapered down to 16mm.
that way ill get both stiff and thinner and faster keel. :thumb:


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