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Re: Wing ribs 09 Dec 2013 01:08 #417

I mentioned one time I have some experience in composites. I think you can make carbon tubing pretty easy. I made this hollow carbon tube that was in the shape of a prop once. It whizzed around at about 6000 rpm. It was really pretty strong and I didn't break it until I miss judge the slip angle landing and ended up in the top of a tree. This is a 30 in prop on a 150cc twin.

I posted some pictures on our site. Here's the link.

groups.yahoo.com/group/Carbondragonbuild.../1955791425/pic/list

Making a carbon tube assembly that doesn't spin at 6K could be done easily.

Karl

--- In This email address is being protected from spambots. You need JavaScript enabled to view it., "Philip Lardner" wrote:
>
> I don't know how Atos fabricate their hollow ribs (I'll take a look at a
> friends VQ next time we're flying), but one process that might work is to
> form them around a foam core as already described and then (through a couple
> of small holes at non-critical locations) to inject a solvent (acetone) to
> remove the PVC foam, which comes out as a gloopy snot! I read about this in
> John Wanberg's Composite Materials Fabrication Handbook #1 of 2 (available
> from Amazon.) I'm not sure the extra work would be worth the effort given
> the weight of the foam involved.
>
> Phil.
>
> _____
>
> From: This email address is being protected from spambots. You need JavaScript enabled to view it.
> [This email address is being protected from spambots. You need JavaScript enabled to view it.] On Behalf Of Rick
> Mullins
> Sent: 06 March 2012 12:21
> To: This email address is being protected from spambots. You need JavaScript enabled to view it.
> Subject: Re: [Carbondragonbuildersandpilots] Re: Wing ribs
>
>
>
>
>
> I don't know if you are familiar with the ATOS hang glider. They fabricate
> carbon fiber ribs that have a hollow box structure and are very light and
> strong. I always wondered how they make them. I suppose they vacuum form
> them over a male mold which would give a U shape, Then after removing them
> from the mold you then somehow do that last surface, but how do you keep the
> cloth from collapsing without internal support?
>
>
> : Philip Lardner <philiplardner@...>
> To: This email address is being protected from spambots. You need JavaScript enabled to view it.
> Sent: Monday, March 5, 2012 7:55 PM
> Subject: RE: [Carbondragonbuildersandpilots] Re: Wing ribs

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