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by downunder
Fri Dec 15, 2017 3:02 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 20
Views: 598

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: 20
Views: 598

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: 20
Views: 598

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: 20
Views: 598

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: 20
Views: 598

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: 11816

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: 599

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: 599

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!
by downunder
Sat Dec 09, 2017 3:54 am
Forum: Board Builders
Topic: vac pump (a fridge compressor) problem
Replies: 11
Views: 635

Re: vac pump (a fridge compressor) problem

Thanks guys, all valid points. As said, it is not about the technicality of the setup, ie for fans see: http://geoffg.net/fancontroller.html No vac tank coz worked in confined space for years. That has changed now with a new house. It is about the new pump which just refuses to start in less than 3m...
by downunder
Fri Dec 08, 2017 6:53 am
Forum: Kitesurfing
Topic: Tuning the Flysurfer Boost v1 9m? Flutter issue.
Replies: 6
Views: 398

Re: Tuning the Flysurfer Boost v1 9m? Flutter issue

So here it is guys, a proof that all attachments are waaay off from the design OR the lines shrunk so badly (which I do not believe). This is particularly important for lines a1, a2 and a3 since we talking 4cm shorter a3 line: Boost-LP_9.jpg If the kite is powered well and the line a3 is shorter tha...

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