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Building my next mast

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SaulOhio
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Building my next mast

Postby SaulOhio » Sat May 19, 2018 1:17 am

I'm prepping the molds for my next mast. This one will be about 84cm. My previous one was about 54cm, and I've pretty much outgrown it.
20180518_200229[1].jpg
From what I have gleaned on this forum, the best way to get this stiff is to lay the carbon cloth so the fibers lie at a 45 degree angle.
The core is going to be a piece of bass wood without much shape to it, so there's going to be a lot of epoxy. Hopefully its not going to be too heavy to float.

I am also working on a new wing that will be about 55 X 20 cm, and a foam core. I still need to fill in a few spots and paint
it with epoxy paint.
20180518_201159[1].jpg
All of my molds were cut on my X-Carve CNC machine. I have had some pretty good success riding my foil so far.


NorCalNomad
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Re: Building my next mast

Postby NorCalNomad » Sat May 19, 2018 7:10 am

Think you need a bigger board...

pretty wood molds though

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SaulOhio
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Re: Building my next mast

Postby SaulOhio » Sat May 19, 2018 10:38 am

NorCalNomad wrote:
Sat May 19, 2018 7:10 am
Think you need a bigger board...

pretty wood molds though
Smaller, actually. I built that one out of an old windsurfer that I broke on a hard landing. And I overbuilt it. Its HEAVY. I am going to build something smaller and MUCH lighter.

The molds aren't wood. They are PVC, and covered in finishing putty. I'm going to paint them with appliance epoxy before I lay up carbon in them.

airsail
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Re: Building my next mast

Postby airsail » Sat May 19, 2018 9:44 pm

You need your carbon running at 45 degrees to prevent twisting, but at 90 degrees (along the mast ) to prevent flexing. It is hard to get a mast stiff enough when going longer in a homebuild, that's where the production masts have the edge.

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SaulOhio
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Local Beach: Mentor Headlands
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Favorite Beaches: Kite Point in the Outer Banks
Gear: Liquid Force Havoc, 12m and 16M
Slingshot Turbo Diesel 8M
Rossignol Escort skis
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Re: Building my next mast

Postby SaulOhio » Mon May 21, 2018 11:14 pm

airsail wrote:
Sat May 19, 2018 9:44 pm
You need your carbon running at 45 degrees to prevent twisting, but at 90 degrees (along the mast ) to prevent flexing. It is hard to get a mast stiff enough when going longer in a homebuild, that's where the production masts have the edge.
Thanks. I am going to alternate between a high K tow cloth at 45, unidirectional lengthwise, and a nice twill weave on the outside layer.

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SaulOhio
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Favorite Beaches: Kite Point in the Outer Banks
Gear: Liquid Force Havoc, 12m and 16M
Slingshot Turbo Diesel 8M
Rossignol Escort skis
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Re: Building my next mast

Postby SaulOhio » Wed May 23, 2018 10:59 pm

I love trimming a carbon/epoxy part. All that lovely dusk to get in your skin.
ZZ.jpg

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SaulOhio
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Local Beach: Mentor Headlands
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Favorite Beaches: Kite Point in the Outer Banks
Gear: Liquid Force Havoc, 12m and 16M
Slingshot Turbo Diesel 8M
Rossignol Escort skis
Brand Affiliation: None

Re: Building my next mast

Postby SaulOhio » Sun Jun 03, 2018 3:43 am

The much longer mast came out good, and makes a big difference. Because I have a much larger margin for error, I got my longest rides so far today.



Its still a little twisty, but much stiffer than my previous masts.

The larger front wing I made worked OK, but seemed a bit unstable, and I couldn't ride downwind with it. It may need a bigger stabilizer behind it. I switched to my older wing, and that rode great.

I may also add a vertical fin to the back of my fuselage.

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Re: Building my next mast

Postby Dar73 » Mon Aug 20, 2018 1:52 pm

Why dont you stick 1 or 2 longitudinal spars down the length of the mast the help with siffness?

Something like this where he fits the spars..... https://www.youtube.com/watch?v=NxUQJls26OQ


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