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by downunder
Sat Dec 16, 2017 2:07 pm
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 27
Views: 878

Re: Mast/Strut Fiber Angles

I did not say WS mast is under torsion! :) but, have a look how they are made in recent years. Nope, the angled and spiral reinforcement is used in ie concrete anchorages. Which might not be cylindrical. Also used in concrete elsewhere. Nothing new in civil engineering. That is what I've said: "Only...
by downunder
Sat Dec 16, 2017 3:56 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 27
Views: 878

Re: Mast/Strut Fiber Angles

I recon, initially, only 0 carbon is opposing torsion anyway. This is for the first torsion angles. 0/90 in a sense of 0 being the mast length. Correct? Only if there is carbon placed on extreme low angles, it would kick in initially. But does anyone build in such a way? So, we can simplify and say ...
by downunder
Fri Dec 15, 2017 3:02 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 27
Views: 878

Re: Mast/Strut Fiber Angles

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=199&t=2395452&p=966747&hilit=weight#p966747 From above: "Used 130ml epoxy for this job. All together 8 layers (4 each side), 2x 45degrees, 1x UNI, 1x big...
by downunder
Thu Dec 14, 2017 5:44 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 27
Views: 878

Re: Mast/Strut Fiber Angles

^ 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...
by downunder
Thu Dec 14, 2017 4:42 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 27
Views: 878

Re: Mast/Strut Fiber Angles

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

Ok, I'll try to do some flex tests with no plug.
by downunder
Wed Dec 13, 2017 7:56 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 27
Views: 878

Re: Mast/Strut Fiber Angles

Yep. I ran uni-on the angle from corner to corner of mast. Maybe 10 deg? This means it's not wrapped, correct? Because very hard to go 'around' mast LE with Uni. Not impossible, but hard. I still need to make a plug, so no. No tests for now. Also, I'm building for 60kg rider, and you are 80-90 :)
by downunder
Wed Dec 13, 2017 1:58 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 27
Views: 878

Re: Mast/Strut Fiber Angles

been writing to long, some answer were posted; @ tegirinenashi; for a mast , a DIY build, to reach a fair stiffness and torsion, you put 2 to 3 mm wall tickness of fibre carbon on each side. If using about 200g/m^2 cloth, 1mm thick carbon is 5 layers. 3mm carbon would be 15 layers. 15 layers each s...
by downunder
Tue Dec 12, 2017 7:37 am
Forum: Kitesurfing
Topic: Free kite plans on GitHub
Replies: 92
Views: 11861

Re: Free kite plans on GitHub

Face it, it's a feminine, better (?), part of you :)
by downunder
Tue Dec 12, 2017 3:57 am
Forum: Kitesurfing
Topic: Tarifa to Vladivostok
Replies: 8
Views: 623

Re: Tarifa to Vladivostok

It might be worth a shot to contact Jaros from SL, and direnc from TR, both active on this forum...They both know me via email.

Best

D.
by downunder
Mon Dec 11, 2017 3:19 am
Forum: Kitesurfing
Topic: Tarifa to Vladivostok
Replies: 8
Views: 623

Re: Tarifa to Vladivostok

You are a Legend Bojan! I think the most dangerous part is Italy :)

I always watch Turkey from the plane when crossing over to the EU, gorgeous beaches from above!

All the best and good luck!

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