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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Thu Feb 13, 2014 12:36 am 
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Here is my DIY wing collection along with the stock MHL wing set. Top DIY foil is best by far using the stock tail wing. It is fast and very docile, drives with front foot almost like a surfboard.. Second DIY foil showed promise but delaminated during a high speed broad reach. It was a little too twitchy to be fun. Third DIY foil is super fast a little unstable but fun to ride. It hums at high speed so it will not last long before it comes apart. The small DIY tail foil was a bust. Too small. All main foild with DIY tail foil felt very sensitive to pitch.

Next step is to build a slightly larger tail foil with vertical winglets and a refined main foil like the Top DIY foil. Slightly thinner wing thickness. Slightly wider center section. Slightly narrower wings outboard of center section. More washout on wing tips.

DP out!


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Thu Feb 13, 2014 6:43 am 
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Joined: Wed Aug 24, 2011 11:39 am
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Nice collection. What material are they made from?
How thick ?
What foil shape?
Are foil 1 and 2 pointing toward the front like foil3?
Thanks


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Thu Feb 13, 2014 8:52 pm 
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All foils are pointing the same direction. Front toward top of picture. All are made form oak core with layers of glass and polyester resin.

The top one is the best. foil shape is an Eppler 817 at 7% thickness. The main lift is produced in the center 1/3 of the wing. The down turned tips provide stability.

The second one is ok. Foil shape is the FX 71 at 5% thickness. Too much lift on the tips causes it to fly left and right faster than I can control at speed.

The third on is really fast. Foil shape is an Eppler 817 at 5% thickness. 2 degree washout on the tips. Straight line speed is great, tip ventilation is a problem when banked going up wind.

The small tail plane is too small to be used with any of the wings. Way too pitchy.


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Feb 15, 2014 1:56 am 
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Joined: Tue Mar 23, 2010 1:16 am
Posts: 308
Location: Chile/Brasil
great wings dlprince69!!
when you mean 7% root is because you used half of the eppler 817 profile?
what i mean is if you used the upper half of the wing with a camber and a flat bottom (asimetrical).

questions to fórum colaborators:
1.if wings and fuselaje are more succeptible to impact or damage, wouldnt kevlar outer Shell or kevlar/carbón hybrid cloth make a better material to use as final finish layer?
2.as general rule what is the average front wing root?
3. what about the root of rear wing?


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Mon Feb 17, 2014 1:00 am 
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Joined: Tue Mar 23, 2010 1:16 am
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Location: Chile/Brasil
Final epoxy coat.
ready for maiden voyage!!
70 Hours logged!
tuesday has forcast for fist trial!!
:thumb:
so happy with my first foil.
Marsopa Model :D


Attachments:
2014-02-16_18-59-31_689.jpg
2014-02-16_18-59-31_689.jpg [ 2 MIB | Viewed 666 times ]
2014-02-16_18-59-48_820.jpg
2014-02-16_18-59-48_820.jpg [ 1.56 MIB | Viewed 666 times ]
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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Tue Mar 04, 2014 8:29 pm 
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windfreak74 wrote:
Final epoxy coat.
so happy with my first foil.
Marsopa Model :D

Well, Have you ride it yet?


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Tue Mar 04, 2014 8:39 pm 
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Location: Florida--JACKSONVILLE
looks good windfreak!


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Wed Mar 05, 2014 12:37 am 
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Location: Chile/Brasil
weather has played tricks on me.
this weekend shows promise.
ill post pics or video as soon i get footage.
:thumb:


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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Mar 08, 2014 1:30 am 
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Joined: Tue Mar 23, 2010 1:16 am
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Location: Chile/Brasil
Ok today i was bored as hell so wipped up this high AR wing as another test.
took me an hour to make profile and cut the pattern.
tomorrow ill vaccum bagit.
still havent ridden my DIY foil but im still building!! :D
tomorrow i think it will be maiden voyage. got my gopro ready for the premier!!


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2014-03-07_20-15-43_574.jpg
2014-03-07_20-15-43_574.jpg [ 857.56 KIB | Viewed 283 times ]
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 Post subject: Re: DIY Home Made wooden Hydrofoil fins
PostPosted: Sat Mar 08, 2014 1:32 am 
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Joined: Tue Mar 23, 2010 1:16 am
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Location: Chile/Brasil
54 cm span
12 cms chord lenght
root 9mm
somewhere in the 600 cm2


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