Re: Re: Boron safety data sheet

From: Bill Gowen <wdgowen_at_gmail.com>
Date: Wed, 5 Jan 2011 15:05:23 -0500

Or for a different solution carbon tow pulled from Russian unidirectional carbon fabric weighs 8.4 mg for 24". Probably not as strong as boron but is breakage a problem for boron on wing spars?

  ----- Original Message -----
  From: leop12345
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Wednesday, January 05, 2011 1:55 PM
  Subject: [Indoor_Construction] Re: Boron safety data sheet


    


  To find out what core is in your fiber, just weigh a fiber (or a bunch). For 24" long tungsten cored fibers, the 0.004" fibers weigh about 13 mg while the 0.003" weigh about 8 mg. Using Ray's numbers for the carbon cored fibers, 24" x 0.004" carbon cored fibers should weigh about 10 mg each.

  BTW, an F1D today might use up to 80 mg of tungsten cored boron fiber. Using the lighter carbon cored fiber could result in a savings of 18 mg, about 1.5% of the minimum weight of 1200 mg, a significant savings.

  Leo

  --- In Indoor_Construction_at_yahoogroups.com, "ray_harlan" <rbharlan_at_...> wrote:
>
> It must be tungsten core. I haven't had carbon for quite a few years.
>
> Ray
>
> --- In Indoor_Construction_at_yahoogroups.com, Tapio Linkosalo <tapio.linkosalo_at_> wrote:
> >
> > On 4.1.2011 18:38, ray_harlan wrote:
> > > The boron that I have now all has tungsten core. They no longer make a
> > > carbon core and did so only for .004" or larger. The weight savings for
> > > the carbon-cored material was about 30%.
> >
> > The boron I have was bought in the spring 2004. Which core did that have?
> >
> >
> >
> > -Tapio-
> >
>



  
Received on Wed Jan 05 2011 - 12:14:42 CET