Author Topic: Carbon limbs  (Read 1032 times)

Offline AndyTurner

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Carbon limbs
« on: November 09, 2020, 07:11:46 AM »
So I’ve been having a look at BearPaws website and they sell two types of Carbon laminate. Stable core and Power Carbon.
Does anyone have experience with this stuff?
Is there a common layup? E.g. 2XPower carbon & 2XStable core?
Do you still use Fibre glass for the belly & Back or does the Carbon fibre replace this?

Online Longcruise

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Re: Carbon limbs
« Reply #1 on: November 09, 2020, 09:15:49 AM »
Stabile core is used to provide torsional stability.   It is a 90 degree carbon weave about .o15 thick.  It is flexible and without resin.  Easy to work with and is easily cut with scissors.   It takes on it's stabilizing properties when glued into the lay up.

I'll leave the carbon question to those who use it.

A picture of stabil core


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Online Flem

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Re: Carbon limbs
« Reply #2 on: November 09, 2020, 09:18:18 AM »
No first hand experience here. I don't know of anyone making carbon back or belly laminate. Bearpaw's are both core additions.

Online Mad Max

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Re: Carbon limbs
« Reply #3 on: November 09, 2020, 09:31:45 AM »
This subject comes up here every now and then. I don't think you will find your answer here. ;)
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Online Shredd

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Re: Carbon limbs
« Reply #4 on: November 09, 2020, 10:28:51 AM »
  why do you want to use carbon and what will you be using it for??

Offline AndyTurner

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Re: Carbon limbs
« Reply #5 on: November 09, 2020, 10:40:20 AM »
Well, moving from “just wood” to “fibre glass and wood” felt like a big step forward. CF intrigues me.
Bodnik provide a 30 year transferable warrantee on their bows which for me is phenomenal. I believe for their Ghost bow they say you can even leave it strung!!!
Now that for me says they must know how to make bows!!!!
They also sell BearPaw CF for making bows. I’d love to know how they use it!

Online Longcruise

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Re: Carbon limbs
« Reply #6 on: November 09, 2020, 01:52:09 PM »
There are American bowyers using carbon but I'm not sure where they get it.  Probably not from Bearpaw.
"In times like these, it’s important to remember – there have always been times like these.”  Paul Harvey

Online Shredd

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Re: Carbon limbs
« Reply #7 on: November 09, 2020, 02:20:01 PM »
   i would do glass bows for a while until you get your design wired and in the meantime educate yourself on carbon...  after you are satisfied with your design then try carbon...  from what i hear carbon can be difficult, brittle and expensive...  those guys that are successful at building carbon bows may have a few tricks up their leave, which could take years of working out the bugs...  I also hear the rewards are not that great with carbon...  carbon is a lot stiffer but glass is a lot tougher...

   just my 2cents...

Online Roy from Pa

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Re: Carbon limbs
« Reply #8 on: November 09, 2020, 02:28:29 PM »
In my experience, carbon limb bows were noisy.

Offline AndyTurner

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Re: Carbon limbs
« Reply #9 on: November 09, 2020, 04:11:16 PM »
Hey guys,
thank you for all your replies. It’s much appreciated.
Best regards,
Andy

Online jess stuart

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Re: Carbon limbs
« Reply #10 on: November 10, 2020, 08:32:54 AM »
The Rosewood Shop is or was selling carbon.  The same stuff Dale Stahl was selling.  I have no personal experience with it. 

Online Crooked Stic

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Re: Carbon limbs
« Reply #11 on: November 10, 2020, 10:15:07 AM »
I always thought Stable core is woven glass? And it would be better with 45 degree layup.
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Offline Mark R

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Re: Carbon limbs
« Reply #12 on: November 10, 2020, 10:53:52 AM »
 Stabil core is for torsion stability, there are different types of carbon lay ups, what you saw on the website I believe is unidirectional carbon used as a core and about .015 and binghams has it in .020 it's not used on the back or belly, that should be layerd woven carbon at a 45 degree weave usually around .040. I've used it for the back only with bow glass on the belly, some use the carbon on the belly also. Not easy to find the layerd weave but it is available a few places but you have to check around and ask for it. If you want to experiment it will work with I would say any glass designed bow using a similar core, its much more expensive than glass but with a good design can work really well which may take some tinkering. JMHO.

Offline bucknut

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Re: Carbon limbs
« Reply #13 on: November 11, 2020, 05:11:11 AM »
We have several sponsors on here that make carbon bows.  Morrison, Javaman and Zipper to name a few. They would most likely give you any info you need if you contact them.
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Online Flem

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Re: Carbon limbs
« Reply #14 on: November 11, 2020, 11:32:32 AM »
Well, moving from “just wood” to “fibre glass and wood” felt like a big step forward. CF intrigues me.
Bodnik provide a 30 year transferable warrantee on their bows which for me is phenomenal. I believe for their Ghost bow they say you can even leave it strung!!!
Now that for me says they must know how to make bows!!!!
They also sell BearPaw CF for making bows. I’d love to know how they use it!

30yrs sounds impressive until you consider that there are hundreds, if not thousands of laminate bows made
in the 50's, 60's and 70's that are still in use.

Online Flem

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Re: Carbon limbs
« Reply #15 on: November 11, 2020, 07:14:03 PM »
I just remembered reading about the laminate Buemaker uses. Exel of Finland. Too bad you guys bailed out of the EU, although you might still be able to get their products ;)
Looks like they have carbon fiber laminates for back and belly surfaces

https://exelcomposites.com/wp-content/uploads/2020/06/EN_Exel-Archery-Laminates_Datasheet-2017.pdf

Offline AndyTurner

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Re: Carbon limbs
« Reply #16 on: November 11, 2020, 07:42:10 PM »
Now that’s exactly the sort of thing I’m after. Will look properly tomorrow but looks like hot stuff!

I’ve been searching the web looking for data sheets on Gordon glass today. I know it’s not CF but I’d like to know the numbers to compare. Couldn’t find anything. Does anyone have one for UL and ULS?

Thanks
Andy

Online Mad Max

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Re: Carbon limbs
« Reply #17 on: November 11, 2020, 08:24:59 PM »
 "The minimum quantity for standard archery widths is 2000 meters/laminate type."
That's 1093  72" pieces :o

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Online Flem

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Re: Carbon limbs
« Reply #18 on: November 11, 2020, 09:19:21 PM »
Forget getting any info for "Gordons", they were bought by a large multinational corporation, PolyOne and have been eliminating the Gordons website slowly for a number of years now.
I listed some info I had for Gordons in a post long ago. Don't ask when.
By the way, Gordons does make CF laminates, but nobody sells it.

Online mmattockx

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Re: Carbon limbs
« Reply #19 on: November 11, 2020, 10:02:06 PM »
Now that’s exactly the sort of thing I’m after. Will look properly tomorrow but looks like hot stuff!

I’ve been searching the web looking for data sheets on Gordon glass today. I know it’s not CF but I’d like to know the numbers to compare. Couldn’t find anything. Does anyone have one for UL and ULS?

Thanks
Andy

Attached is a pdf of Gordon's composites info, current as of April 2020.


Mark

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