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Mast/Strut Fiber Angles

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plummet
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Re: Mast/Strut Fiber Angles

Postby plummet » Wed Dec 13, 2017 5:56 pm

Sorry your right. My bad.

Should have been 0,15,30,45

You could potentially omit 45's and run 0,15,30. But dual 45 angles are easy to achieve so why not.

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foam-n-fibre
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Re: Mast/Strut Fiber Angles

Postby foam-n-fibre » Wed Dec 13, 2017 9:44 pm

bacon2109, Do I understand correctly from the link you provided that you have a total of 800g or 24oz of carbon on each side of your core? I think that's a light layup, and I don't think you are going to make it stiffer with fibers at 60 degrees. I think you should get some unidirectional in there.

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Re: Mast/Strut Fiber Angles

Postby downunder » Thu Dec 14, 2017 4:42 am

^Than what's my layup? An ultralight? A feather light? :)

Ok, I'll try to do some flex tests with no plug.

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Re: Mast/Strut Fiber Angles

Postby bacon2109 » Thu Dec 14, 2017 4:56 am

yes, it's light. 6K CF (370g/m2)

---reading what i wrote on french forum---

..... sorry small mistake .... big one ......memory failing.
I used 18oz UD carbon fibre. about 610 g/m2.

good enough for learning foiling

I should have put 2 layer at 0 degree, but was getting to thick

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Re: Mast/Strut Fiber Angles

Postby plummet » Thu Dec 14, 2017 5:33 am

If mast is critical for stiffness. The stiffer the better. The difference between too flexible and stiff is only a few hundred grams. My call is to make sure the mast is STIFF. If you want to skimp on weight take it out of the board, fuse and wings.

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downunder
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Re: Mast/Strut Fiber Angles

Postby downunder » Thu Dec 14, 2017 5:44 am

^
Uhm, man, try Levitaz. You'll be surprised. Yes, people actually race with those, so all torsion stiffness is questionable.

Earnestly, with all that carbon, 610 g/m2, we talking weight similar to ALU. Why bother than? Plus, ALU is way thinner.

BTW, 610g/m2 would be impossible to wrap.

If carbon is not wrapped around the LE, than all it does for torsion is up to the LE strength. If LE is just wrapped in UNI and eventually 45/45 (or whatever), the torsion max strength is coming from 45/45 fibers. Not UNI.

We reach the max torsion strength on LE, it snaps.

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Re: Mast/Strut Fiber Angles

Postby bacon2109 » Thu Dec 14, 2017 3:20 pm

I just weighed the mast = 1.60x Kg
the mortise are made of fiberglass, stainless steel flange nuts (4 x 6mm );
-board side=KBox,
-fuselage side=homemade
and for learning, fiber glass wings

I dont know the weight of a alu one, only hand weight a Shinn one, board and foil

home made, board and foil weight, with body scale, 6.8Kg
BTW, 610g/m2 would be impossible to wrap.
, if you looked at the picture , it's a ugly think to ride on

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foam-n-fibre
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Re: Mast/Strut Fiber Angles

Postby foam-n-fibre » Thu Dec 14, 2017 3:41 pm

downunder wrote:
Thu Dec 14, 2017 4:42 am
^Than what's my layup? An ultralight? A feather light? :)
Downunder, what is your layup then? Are you saying you have less than 800g per side? That would be less than 4 layers of 6oz (200g) cloth per side. If so then what is your core? I think the layers that I wrapped around my leading edge were no more than 6oz/200g in weight, but there were quite a few

Mine has more than twice that amount of carbon over a corecell core, and it is way lighter than aluminum, especially if the Aluminum is full of water!

Also, you say "try Levitaz". I've never seen one, what are you saying about it - are they really flexible?

Peter

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Re: Mast/Strut Fiber Angles

Postby downunder » Fri Dec 15, 2017 3:02 am

Heaps less than 800g. I mean, 800g would be 4 times by one square meter per side:)

Here is the carbon weight: http://kiteforum.com/viewtopic.php?f=19 ... ht#p966747

From above: "Used 130ml epoxy for this job. All together 8 layers (4 each side), 2x 45degrees, 1x UNI, 1x big squares finish layer. Will see."
Mast weight at that time 725 grams.

The build: http://kiteforum.com/viewtopic.php?f=19 ... 8&p=951592

ALU Manta mast is 1.8kg if remember well. The only benefit to build in carbon is to float. But, now I see paid $50 for Manta, so...

Levitaz, specially for torsion, is surprisingly flexy. That is the HF with stainless steel fuselage.

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Re: Mast/Strut Fiber Angles

Postby plummet » Fri Dec 15, 2017 3:20 am

Hehe.... I have 800gm uni and 800gm twill in the mast.
Needless to say it doesn't break when I hit the sea floor, fish and submerged logs!
It also weighs heaps less than a alloy mast and floats.... so win win.


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