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Plywood surf foil wing

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Jyoder
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Re: Plywood surf foil wing

Postby Jyoder » Mon May 27, 2019 12:09 pm

Hpr wrote:
Mon May 27, 2019 9:57 am
Jyoder wrote:
Mon Apr 01, 2019 1:05 am
.... I glued 2 layers of already warped 1/2in plywood together and shaped with hand tools....
Does 'already warped' refer to dihedral? Or how did you get the dihedral?
I used 1/2inch ply which is hard to bend and laminate a curve so I picked pieces that were already a little curved and laminated them together with clamps to the the 1 inch Anhedral.

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Re: Plywood surf foil wing

Postby Mikey » Mon May 27, 2019 5:44 pm

[quote]Yes just a bit at LE and TE to make it a semi-symmetrical airfoil. Mostly flat on bottom so rests flat on fuse.[/quote]

Cool - Clark Y profile (more or less) :D

Thanks!

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Re: Plywood surf foil wing

Postby Europ2 » Mon May 27, 2019 11:49 pm

Another fast candidate, easy to route because flat underneath (intrados) : Aquila9.3 smoothed and x0.8 = Aquila7.4
Airfoiltools.com allow to slim airfoil sections down using the "Airfoil plotter" menu on the left.

http://airfoiltools.com/airfoil/details ... quilasm-il
Aquila9.3 and 7.4  smoothed.png
Aquila9.3 and 7.4 smoothed.png (11.38 KiB) Viewed 1058 times

vakiter
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Re: Plywood surf foil wing

Postby vakiter » Wed May 06, 2020 7:01 pm

inspired by this thread, i made a plywood wing based off of stringy wing, which i really like. i made it a little longer le to te for more area, probably thicker overall, and added a slight anhedral to try and increase yaw-stability. i didnt go wider because i do a lot of shallow-water starts.

rode it on the LF setup , and i really like it. feels very similar to stringy, but slower top end and earlier planing.
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Re: Plywood surf foil wing

Postby fluidity » Mon Jul 06, 2020 10:23 am

I love it!
I'm 3D printing my one but I like that you are showing it doesn't take high tech to get a great result!

vakiter
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Re: Plywood surf foil wing

Postby vakiter » Wed Jul 08, 2020 1:49 pm

so, this wing quickly became my favorite. good compromise between surf-ability (of swell not waves), and speed. however it snapped when i was banking hard on a turn. next time i wont use a crappy piece of used plywood!

it was nice to know homemade wings are as good as (some) factory wings, and a good learning experience by modifying existing design.
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Last edited by vakiter on Wed Jul 08, 2020 5:28 pm, edited 1 time in total.

kollac
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Re: Plywood surf foil wing

Postby kollac » Wed Jul 08, 2020 2:29 pm

vakiter wrote:
Wed Jul 08, 2020 1:49 pm
so, this wing quickly became my favorite. good compromise between surf-ability (of swell not waves), and speed. however it snapped when i was banking hard on a turn. next time i wont use a crappy piece piece of used plywood!

it was nice to know homemade wings are as good as (some) factory wings, and a good learning experience by modifying existing design.

2020-06-02 13.23.15.jpg
bummer, but also - kickass project! How much glass did you have on it? From the picture it doesn't look like much. 2 layers of 4oz? Also, is it possible that you didn't "drill-fill-drill" the bolt holes and water got in and started doing it's thing with the core material?

vakiter
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Re: Plywood surf foil wing

Postby vakiter » Wed Jul 08, 2020 7:00 pm

yeah... probably 2 layers of glass, did epoxy. i did drill and fill the holes but since they were tapered to accept the bolts, they didnt have glass on them, which means the amount of glass across the center is less. this is what failed. also using a piece of solid wood is probably better. but the plywood guides are really nice for shaping as the OP noted.

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tegirinenashi
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Re: Plywood surf foil wing

Postby tegirinenashi » Wed Jul 08, 2020 8:16 pm

The load on the wing is not distributed evenly, it is linearly increasing towards the center. Therefore, the optimal design is something like:
- 4 layers (each side) at the center 1/4 center piece
- 3 layers covering 2/4 center piece
- 2 layers covering 3/4 of the wing
- 1 sheet at the wing tip area.

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Re: Plywood surf foil wing

Postby bay surfer » Thu Jul 09, 2020 12:15 am

I have made several wings past years all just have 1 layer of carbon and epoxy laminated ply, damn things are indestructible. Recently laminated 1/4 inch XPS yes the pink stuff with a wood insert where the bolts and hand pressed/pegged carbon on with 2 layers of glass over that, that also seems indestructible light and it floats.
Little wing and its big brother.Image
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