Forum Index

 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Carbon and Flax Fiber Layup

 
Post new topic   Reply to topic     Forum Index -> Ski/Snowboard Design and Layup
View previous topic :: View next topic  
Author Message
palumpia



Joined: 26 Dec 2015
Posts: 1

PostPosted: Wed Aug 09, 2017 11:24 am    Post subject: Carbon and Flax Fiber Layup Reply with quote

Hello everyone

in my new ski design i want to do a layup with uni CF and a biax flax fiber under and over the wood core. does anyone has some experience with this kind of layup?

Any answers gratefully received

Thanks palumpia
Back to top
View user's profile Send private message
24Dave



Joined: 03 Oct 2011
Posts: 80

PostPosted: Wed Aug 09, 2017 2:17 pm    Post subject: Reply with quote

never even seen flax fabric at least any intended to be a laminate layer. Black Diamond Helios seem to describe flax as part of the core like this:

https://www.skibaumarkt.de/en/product/bcore-d200-balsa-190-x-14-cm/

dps core looks like the same material:

https://www.wildsnow.com/15521/outdoor-retailer-2015-good-stuff/
Back to top
View user's profile Send private message
mammuth



Joined: 28 Oct 2014
Posts: 242
Location: somewhere in the alps

PostPosted: Wed Aug 09, 2017 2:20 pm    Post subject: Reply with quote

http://bcomp.ch/en/products/amplitex

you need high pressure to get a decent flax/epoxy laminate, otherwise it tends to become heavy afaik
_________________
Tom
Back to top
View user's profile Send private message
pmg



Joined: 01 Dec 2012
Posts: 432
Location: Sonthofen

PostPosted: Mon Aug 14, 2017 10:16 am    Post subject: Reply with quote

AFAIK flax has great dampening properties, and I think dampening along the length of the ski is more important than torsional dampening, hence I use thin Uni flax and normal triax/biax carbon. I love riding the results!
Back to top
View user's profile Send private message
Hannes



Joined: 09 Nov 2011
Posts: 74
Location: NRW, Germany

PostPosted: Sun Aug 20, 2017 7:41 pm    Post subject: Reply with quote

I made a pair with flax biax and uni glass. It was a very smooth ride but heavy as mammoth wrote. The pressure of a vacuumsetup ist not high enough to get a good fibre-resin ratio.
Next pair will get glass triax and a thin layer Uni flax. I will take a closer look at the amount of resin I use.
Back to top
View user's profile Send private message
mammuth



Joined: 28 Oct 2014
Posts: 242
Location: somewhere in the alps

PostPosted: Mon Aug 21, 2017 2:37 pm    Post subject: Reply with quote

5bar pressure says bcomp afair
_________________
Tom
Back to top
View user's profile Send private message
SleepingAwake



Joined: 11 Oct 2010
Posts: 109

PostPosted: Sat Aug 26, 2017 11:56 pm    Post subject: Reply with quote

The fiber volume content you get with a flax fabric depends hugely on the fabrics architecture. With the stitched biax or the uni fabric from bcomp the fiber volume ratio is quite good. It seems tho that you need a lot of resin as well, as the density of flax is so low. So a fabric with 350gsm is just thicker than 350gsm of glass and will use therefore more resin to impregnate. But on the other hand it is stiffer than 350gsm of glass as well.

You will get the most damping effect when the fibers are in off axis. Furthermore has flax the biggest advantage if used in a design for stiffness. Therefore I like to combine biax flax at +-45° for torsion with UD carbon or glass. Over the years I made multiple ski like this and love the results.

Here a video of my last build: https://youtu.be/o11Q4Iv7LuI

Cheers, Reto
Back to top
View user's profile Send private message
skidesmond



Joined: 07 Apr 2009
Posts: 2259
Location: Western Mass, USA

PostPosted: Thu Aug 31, 2017 5:29 pm    Post subject: Reply with quote

I use flax with Uni CF exclusively now. I ordered my flax from Bcomp. I just made a pair of skis and I used Entropy Resin that has about a 2:1 ratio. I used 28oz of epoxy with the appropriate amount of hardener. The ski is 174cm with 72mm at the mid point.

The trick to spreading the resin on the flax is to pour resin on a third to half the ski and spread it out. Otherwise the resin will soak straight down into the flax before you get a chance to spread it out evenly. Also you need to be rather quick about it.

I pressed this last pair at 45psi. I get good penetration of resin throughout the layup.

I'll post the specs, weight and pics of the skis when they are done in a few days.
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic     Forum Index -> Ski/Snowboard Design and Layup All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group