Pure carbon skis?

MontuckyMadman · Post by **MontuckyMadman** » Thu Nov 01, 2012 10:04 pm

where are you getting this fiber please?

Sonny · Post by **Sonny** » Thu Nov 01, 2012 10:18 pm

MontuckyMadman wrote:where are you getting this fiber please?

A german company: http://www.hp-textiles.de/
Don't know if they ship worldwide but in E.U. It's fair shipping rates.

MontuckyMadman · Post by **MontuckyMadman** » Thu Nov 01, 2012 11:24 pm

wow. huge company.
what is the cost for what you ordered?

Sonny · Post by **Sonny** » Fri Nov 02, 2012 2:31 am

MontuckyMadman wrote:wow. huge company.
what is the cost for what you ordered?

€368 for 13m2 of 450gram triax carbon, incl shipping to sweden.

Also I couldn't resist ordering some aramid fabric, i'm just to curious if that could be put to use somewhere

chrismp · Post by **chrismp** » Fri Nov 02, 2012 4:37 am

i buy all my composites at hp-textiles as well! though i never order their triax because the weight is spread evenly across all axes, but according to mike from happy monkey you want more fibers running longitudinally. thats why i always buy 320g biax and 440g uni glass.

Sonny · Post by **Sonny** » Fri Nov 02, 2012 10:25 am

chrismp wrote:i buy all my composites at hp-textiles as well! though i never order their triax because the weight is spread evenly across all axes, but according to mike from happy monkey you want more fibers running longitudinally. thats why i always buy 320g biax and 440g uni glass.

Correct, it's 150gram in each direction. Though I figured there pther ways to stiffen up longitudinally. I'll find out how that works in a couple of weeks

Brazen · Post by **Brazen** » Fri Nov 02, 2012 11:27 pm

BGF has a seconds price list, 10/12 oz triaxial weave (faultless) runs about 18 a meter. Ask your glass rep (North American Composites or Composites One) to call them for it.

MontuckyMadman · Post by **MontuckyMadman** » Fri Nov 02, 2012 11:35 pm

Bgf? What?

Brazen · Post by **Brazen** » Fri Nov 02, 2012 11:39 pm

Not you too...BGF ffs, http://www.bgf.com/industries_served/co ... on_fabric/ . The largest manufacturer of this material in the US?

kylea · Post by **kylea** » Tue Nov 06, 2012 12:27 pm

Brazen wrote:BGF has a seconds price list, 10/12 oz triaxial weave (faultless) runs about 18 a meter. Ask your glass rep (North American Composites or Composites One) to call them for it.

The last I spoke with BGF they made no triax carbon and nothing with a +/- 45° orientation. Maybe my sales rep just didn't know something?

Sonny · Post by **Sonny** » Wed Nov 07, 2012 11:50 am

Ok so the fibers I ordered are as stated 450gram 33/33/33% triax carbon. 150g carbon in the 0 degree.
Do you think that will be enough if I make the core slightly thicker then if I'd used 450g FG with more fibers in the 0 degree direction?
Or would you have used uni carbon instead of thicker core for more stiffness?

I realize many of these questions are impossible to answer but I have never tried carbon and since alot of you have all th input I can get is immensly helpfull.

skidesmond · Post by **skidesmond** » Wed Nov 07, 2012 3:09 pm

I have only a little experience w/ CF. I ran some tests with 9.4oz (270g?) Uni-CF comparing it to 20oz (570g?) triaxial FG. The CF was just as strong as the FG at less than 1/2 the weight.

The triaxial CF sounds very light to me. Just a gut feeling.

http://www.skibuilders.com/phpBB2/viewtopic.php?t=3868

Sonny · Post by **Sonny** » Sun Nov 11, 2012 2:41 am

Ok, so I've been playing around with some CAD software and thinking how to get the weight down as much as possible.

I measured and the first and only pair of skis I made were huuuge (194cm), with 2753 cm2 @ roughly 2480g
= 0,90gr/cm2

My new pair are also fairly large but weighs in at:
2453 cm2

Have anyone out there calculated the same numbers? I would be thrilled to have something to compare to.

MontuckyMadman · Post by **MontuckyMadman** » Sun Nov 11, 2012 9:48 am

per pair or each?

big pow skis made from poplar and glass will not really be under 1800g each unless you do something crazy.
a 1240 gram ski will be insanely light, that's like 2 lbs per ski.

Most of the skis we make weigh right around 2200g per ski.
Big pow skis with plastic topsheets and plastic sidewalls.

Sonny · Post by **Sonny** » Sun Nov 11, 2012 11:43 am

MontuckyMadman wrote:per pair or each?

big pow skis made from poplar and glass will not really be under 1800g each unless you do something crazy.
a 1240 gram ski will be insanely light, that's like 2 lbs per ski.

Most of the skis we make weigh right around 2200g per ski.
Big pow skis with plastic topsheets and plastic sidewalls.

Yes, I meant each. I did another measure today and mine are 2350g per ski, but as i said they are extremely wide. What I was curious about was if anyone have measured the gram/cm2 and come up with a comparable number. Since I'm no genius on CAD software we did use SnoCad-X and with the DXF file exported into a real CAD program you can measure the area of the ski and get a comparable number.

Have anyone of you made some similar calculations?
My first pair which are to soft get a number of roughly 0,85gr/cm2
With plastic sidewalls, plastic topsheet and fiberglass.

For example: (According to Brant Ski magazine Sweden) (each ski)
K2 Sideseth 188cm: 2382cm2 - 2498gr = 1,05gr/cm2
Rossignol S7 190cm: 2310cm2 - 2432gr = 1,05gr/cm2
Völkl Kuro 185cm: 2640cm2 - 3121gr = 1,18gr/cm2
Salomon rocker2 115 188cm: 2266cm2 - 2300gr = 1,02gr/cm2

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Pure carbon skis?