I usually put it on top of the upper spar and under the D-tube sheeting.
Tricky to do, but doable.
Jerry Miller
SOSS-Medford, OR
From: Bill Conkling <[EMAIL PROTECTED]>
To: Michael Conte <[EMAIL PROTECTED]>
CC: Barry Andersen <[EMAIL PROTECTED]>, RCSE <[EMAIL PROTECTED]>
Subject: Re: [RCSE] CF on spruce spars
Date: Sat, 20 Aug 2005 23:54:33 -0400 (EDT)
My thoughts are to put it on the outer surface of the spar. That way, it
will be as far as possible from the other carbon cap and provide the most
effect.
.........bc AG4YQ Williamsburg, VA
On Sat, 20 Aug 2005, Michael Conte wrote:
> The way I understand carbon fiber is that it's better in tension than
> compression. I was taught that it's essentially a rope and you're
> better off pulling a rope than pushing it. I"m thinking the bottom of
> each spar.
>
> My 2 cents.
>
> Mike
>
> On Aug 20, 2005, at 8:22 AM, Barry Andersen wrote:
>
> > I'm building a Challenger (Ray Hayes Skybench kit) and want to put
> > some CF on the spars. I don't want to re-engineer the wing and build
> > a full blown composite spar, just add a bit of stiffness.
> >
> > I have in the past bagged CF to existing spruce spars, but have never
> > been sure whether to put the CF on top of the top spar, or between the
> > spar and the shear webs, same with the bottom. It does seem to make
> > sense to put the CF between the spar and webs to avoid de-lamination.
> > I always lightly scuff the CF and vacuum bag it to the spar.
> >
> > I built a Sailaire wing with the CF between the spar and shear webs
> > that has held up well to my sometimes excessively enthusiastic
> > launches.
> >
> > Thoughts from the learned group??
> >
> > thanks
> >
> > Barry
> >
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