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Hydrofoil mast wooden precision part?

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B19 ELS
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Hydrofoil mast wooden precision part?

Postby B19 ELS » Thu Dec 20, 2018 8:49 pm

Like the wooden clear water hydrofoils, what is the best way to shape the mast so that it is perfect to glass?

I am doing a DIY project.

I'm thinking of using a router with a bearing attachment and then following a template.

How have others done this? Help appreciated.

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Re: Hydrofoil mast wooden precision part?

Postby kitexpert » Thu Dec 20, 2018 9:06 pm

If you are making glassed wood mast it is not that critical, then you will have quite a lot thickness and chord in it and it won't be a low drag mast. But don't worry, it will still work fine and it will be fast enough until you want/need something better/faster.

Shape can be some hydrofoil, just decide the dimensions, thickness and chord length. Glassing will increase measures, depending of course how many and thick layers you will have. You can make a cardboard/plywood template from airfoil to check the shape of the core but you can eyeball it as well, at least if you have some wood working skills.

Symmetry is of course essential.

IDK what router has to do with this kind of work, it is just simple shaping. Plane, spokeshave, rasp and coarse sandpaper are correct tools. If powertools are used electric hand plane and angle grinder are useful but not at all necessary.

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Re: Hydrofoil mast wooden precision part?

Postby BWD » Thu Dec 20, 2018 10:41 pm

Use the cutting tool of your choice to get mast core “close” to needed foil, maybe 1-2mm bigger than final, and faceted. Study how they cut rails on surfboards by progressively beveling the blank in stages, adapt this to the mast.

To get a uniform final shape, you could transfer the foil shape to a block of wood and cut it out, leaving the “female” shape of the foil, sort of like a small, maybe 10-12cm, female half-mold for a mast. Use contact glue to glue sandpaper to the foiled side. This makes a sanding block with the foil shape built in. Can help make both sides the same final shape, if you use the tool the same way on both sides of the mast. Finish sand with a soft block or by hand...

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Re: Hydrofoil mast wooden precision part?

Postby KiterDon » Fri Dec 21, 2018 1:43 am

Any thoughts on how to mate the mast to the screws which attach it to the board and fuselage?

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Re: Hydrofoil mast wooden precision part?

Postby Jyoder » Fri Dec 21, 2018 2:14 am

Unless you have extra epoxy and glass lying around, consider buying a used aluminum mast instead. About as expensive and much stronger and more durable.

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Re: Hydrofoil mast wooden precision part?

Postby KiterDon » Fri Dec 21, 2018 2:22 am

I've alresdy got glass and epoxy. Unless it's a fools errand I mught be willing to try making one. I have two aluminum masts already and would like to try one sized in between the two I have. The main mast strikes me as straight forward. It's the construction of the female threaded part that I am wondering about.

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Re: Hydrofoil mast wooden precision part?

Postby PrfctChaos » Fri Dec 21, 2018 3:10 am

Nave you considered cross barrel nuts? (Might want to put it in a epoxy plug if the wood is weak.)
Attachments
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Re: Hydrofoil mast wooden precision part?

Postby plummet » Fri Dec 21, 2018 5:13 am

The best way would be to cnc cut your profiles..... but that is most likely not an option.

An easy, but labour intensive way, is to cut out a profile of the wing/mast shape tenplate you want and sand/grind the wooden core until it meats the template.

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Re: Hydrofoil mast wooden precision part?

Postby downunder » Fri Dec 21, 2018 6:48 am

Hand plane mate. And sand paper.

Elbow grease and done in a few hrs. Nothing beats an eye.

Your bigger problem atfer that is wrapping in carbon, plus this barrel nuts.

Remember, nuts are brass for a reason, they must give away before bolts. If the bolts snap inside of brass, its game over.

And glass? That’s wobbly mast...

D.


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