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DIY Foil- putting it all together

Forum for hydrofoil builders.


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darippah
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DIY Foil- putting it all together

Postby darippah » Thu May 01, 2014 11:43 pm

what are you guys using to attach all your parts together ? mast to fuselage, mast to board, wings to fuselage ...

currently i'm using stainless steel T-nuts and Machine screws for everything aside from the mast to fuselage which is permanently attached with fiberglass/carbon.

I Will be making a second foil which I'd like to have everything removable for travel, I can't figure out a way to get put a nut/ threaded insert in the mast to attach to the fuselage with enough strength. Anyone have any ideas?

I'm also having an issue with my front wing attachment to fuselage; the fuselage is built from two pieces of wood glued together vertically which was a newbee Mistake! now the wood is beginning to split which is causing the fin to get loose.

any suggestions how to fix this? Would hate to have to cut off the fuselage and replace ...

here's what was used to build my foil- all covered with lots of fiberglass and carbon

-Mast is 1 inch thick oak wood
-wings are 3/4 inch Plywood
-fuselage is 2 1 inch thick oak wood glued together

here's My baby :)
Attachments
unnamed.jpg

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windfreak74
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Re: DIY Foil- putting it all together

Postby windfreak74 » Fri May 02, 2014 12:38 am

great job !! lots of improvements!! did you do wet layup withou vaccum bag?
how much carbón did you use?
do you feel its stiffer that your first versión?
have you ridden it?
:thumb:
Pedro

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darippah
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Re: DIY Foil- putting it all together

Postby darippah » Fri May 02, 2014 1:36 am

windfreak wrote:great ! lots of improvements!! did you do wet layup withou vaccum bag?
how much carbón did you use?
do you feel its stiffer that your first versión?
have you ridden it?
:thumb:
Pedro


Thanks buddy. Thing is really fun although I'm just learning and haven't ridden it since adding carbon. It's actually a modified version of the first one you saw.

For the mast and fuselage I used 1 layer of 12k 300gsm and about 3 layers of 3k 5.7oz plain - 1 90 degrees and 2 45 degrees

Front wing-3 layers of 5.7 ounce; rear wing just one

Much stiffer since adding carbon

I'm able to get up and going for about 12 seconds on my 4th short session. Like many others, my high aspect wing seemed much more stable and easier to learn on.. Hoping for a great session tomorrow!

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Peter_Frank
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Re: DIY Foil- putting it all together

Postby Peter_Frank » Fri May 02, 2014 7:08 am

Looking good :thumb:

But no vertical stabilizer ? (rudder)

Maybe the fuselage can act as one, but would highly recommend it.

Will give better yaw stability (clean riding not nervous) and better turning so a win win :D

Remember, a hydrofoil can NOT be turned at all by edging :roll:
A twintip or surfboard is typically turned by putting weight on the edges (toe/heel pressure )

Doing this on a hydrofoil will have no effect whatsoever, which is why it takes so long to learn - as nothing you have learned from other board sports apply, not even balancing...

You turn and balance a foil by twisting the board around the vertical axis.
So the "yaw" direction is what it is all about, that has to be learned in muscle memory.

8) PF

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Re: DIY Foil- putting it all together

Postby zfennell » Sat May 03, 2014 1:42 pm

darippah wrote:what are you guys using to attach all your parts together ? mast to fuselage, mast to board, wings to fuselage ...

........:)



to the original question,
i think you'll find that the most durable assemblies attempt to have the individual componets carry the loads from piece to piece. as opposed to relying on just the fasteners to transmit all forces.

for example:
mating surfaces with large area to support and constrain parts.
-a flat plat on top of your strut.
-a mortise/tenon joint (best if tapered) like those used for tuttle boxs
- the use of dowl-pins and bushings
-use crush sleeves (bushings) in the clearance holes for threaded fasteners and washers under the screw heads to prevent damage to part from over-tightening.
-Tnuts are good. Barrel nuts are popular when you dont have the luxury of (or dont want) a thru hole



i think you are starting to see 'tuttle' style joints between mast and fuselage.
as well as 'ferrule' style fittings between the main wing and fuselage.
..wing is molded around a hollow stringer along its centerline. Attachment to fuselage is then made by sliding wing over the nose of fuselage.

i'm sure there will be many effective methods, but most try to minimise the loads actually carried by the fasteners.

-bill


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