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by foam-n-fibre
Sun Dec 31, 2017 12:40 pm
Forum: Hydrofoil
Topic: Wrap alu mast with carbon fiber for stiffness
Replies: 13
Views: 965

Re: Wrap alu mast with carbon fiber for stiffness

For someone who is stressing things more than most people, if you were to go with a foam core at very least you'd want a really good hardwood or carbon stringer in the centre. If the foam can compress you can start to have your cross-section thickness reduce, which then allows more bending than if i...
by foam-n-fibre
Sat Dec 16, 2017 1:09 pm
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1267

Re: Mast/Strut Fiber Angles

That windsurf mast article I don't think it very scientific. It's just a guy taking a semi-educated guess. A windsurfing mast in torsion? Torsion is twisting. The sail is not rigidly bonded to the mast. Only friction can apply any torsion on a windsurfer mast. If you have a cylinder in torsion (twis...
by foam-n-fibre
Sat Dec 16, 2017 1:31 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1267

Re: Mast/Strut Fiber Angles

I'll be interested to hear the results of adding fibers at 60 degrees if you think that is the solution. But just to be clear, I'm a mechanical engineer and have a pretty good idea about the physics here, and I can't understand why an angle this sharp would be the solution. This is not exactly my fi...
by foam-n-fibre
Fri Dec 15, 2017 3:51 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1267

Re: Mast/Strut Fiber Angles

I'm not talking about the weight of the carbon on the scale, I'm talking about the unit weight of the carbon. So 200g or 6 oz of carbon is 1 layer of 200g/m2 of cloth, regardless of the surface area you are covering. Sorry, I thought that was obvious from my description. I'm with you Plummet, I've a...
by foam-n-fibre
Thu Dec 14, 2017 3:41 pm
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1267

Re: Mast/Strut Fiber Angles

^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 n...
by foam-n-fibre
Wed Dec 13, 2017 9:44 pm
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1267

Re: Mast/Strut Fiber Angles

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. ...
by foam-n-fibre
Wed Dec 13, 2017 1:11 pm
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1267

Re: Mast/Strut Fiber Angles

Thanks for the replies. I'm not too clear on why we would run fibres at an angle as much as 60 degrees though. My thinking was that 45 was too steep of an angle to be ideal, and that less than 45 might be better. Is there someone that can explain why 60 might be good? It might just be that we can su...
by foam-n-fibre
Wed Dec 13, 2017 12:01 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1267

Re: Mast/Strut Fiber Angles

When I refer to +45 and -45, I mean that the cloth is woven that way, with fibers on both diagonals and none parallel with the roll (it's woven with very thin tracers along the 0 axis to hold the cloth together better). But you are right, it is possible to lay cloth on a diagonal at a shallower angl...
by foam-n-fibre
Tue Dec 12, 2017 7:07 pm
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1267

Mast/Strut Fiber Angles

OK, time for another theoretical question. What is the best angles for the fibers to run on a mast/strut? On the one I built, I used unidirectional carbon (0 degrees) and also some biax at +45 and -45 degrees. Obviously 0 degrees (top to bottom) is best for bending. Is 45 degrees the best for torsio...
by foam-n-fibre
Wed Dec 06, 2017 12:57 pm
Forum: Kitesurfing
Topic: Ram airs crash in 2017
Replies: 23
Views: 1667

Re: Ram airs crash in 2017

Ah c'mon, where is the usual cut and paste of a huge long post? It's trolling at its finest! After all these year I still get a laugh out of it. PMU you're not trying hard enough anymore, this latest one is a real disappointment :(

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