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Re: steve's dragon 12 Dec 2013 23:42 #755

here is a link to some plywood information. AS I was saying, it's better if you can get the plywood at 45 degrees (2 of the 3 plies anyway) for spar webs and leading edges, but it does cost more. Of course, I guess you could make your own. This could be one thing you could do to increase strength even without going to a composite and I guess there would be nothing stopping you from making your own 45 degree plywood by cutting the regular ply at 45 degrees and splicing them together (bit of a hassle, but id you got more time than money...

www.recreationalflying.net/tutorials/scr...builder/plywood.html

--- In This email address is being protected from spambots. You need JavaScript enabled to view it., russell wilson wrote:
>
> hi keeny
> iv got some ply here that was suposedly left over from the wing skins/d
> tube...couldent find my vernias...mesured with a ruler it looks like 0.8mm
>
> russ.
>
> On Thu, Jun 30, 2011 at 11:52 AM, Kenny <kennyrayandersen@...> wrote:
>
> > **
> >
> >
> > I can run the numbers, but I need to know the thinckness of the ply
> > wood and the stiffness if anybody has it. I have data for the composites
> >
> > Generally, for the same material stiffness the buckling allowable goes up
> > as a function squared, the in-plane shear stiffness is only linear -- I
> > think you might be confusing area?
> >
> > Keep in mind that the stiffness of the carbon is MUCH higher than the wood
> > as well, so you really have to run the numbers. It might also be that in
> > common thicknesses, plus the curved shape, the plywood may be thicker than
> > required. In addition to that, with the graphite fabric, you can tailor the
> > lay-up to get the stiffness in the direction you want (i.e. more plies in
> > the +- 45 degree direction, which helps with the shear buckling (D tube
> > should react the torsion).
> >
> > The density is around .06 Lb/in cu vs .1 for aluminum

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