Glassing wing center section

[ed.schummer]

Is this sort of diatribe referred to as a "camel buster"?

Thanks for sharing all this useful stuff Aimer, happy Thanksgiving!

Ed


----- Original Message ----- 
From: "Amir Neshati" <amirneshati at earthlink.net>
To: <discussion at nsrca.org>
Sent: Tuesday, November 25, 2003 12:51 AM
Subject: Re: Glassing wing center section


> Multi layers of lighter glass will yield a stronger part than the same
> weight of
> one cloth layer....And you will have control over where  the most strength
> is needed.
>
> Looking at the wing from a top view, the final glassed section should look
> like
> a diamond, with the wides point at the thickest part of the wing, keeping
> the
> front (LE) and rear (TE) about and  inch  wider than the fuselage
> sides....the next best thing
> is a "V"  viewed from the top, again, nearly an inch outside the fuse at
the
> TE and get
> to the widest part at the LE....
>
> One way to easily control resin weight is to lay the first layer of glass
> down and
> wet it out sparingly, then add the next layer on it and let it soak up any
> excess.
> A  little heat will help wet out the overlay cloth. Each consecutive top
> layer will
> be a little wider than the previous. Usually two layers of 3ish oz cloth
and
> a final
> light layer should do. I fill the weave with a fairly dry mixture of the
> same epoxy
> and micro balloons spread over with a plastic squeegee.
>
> A shear web would be a good idea too.....1/4" vertical grain balsa about
an
> inch past
> the fuselage sides, then glassed, will do wonders......Another alternative
> is Spyder foam.
> 2.3ish lbs. density and a compressive strength of 80 PSI.....Spyder foam
is
> what I believe
> the Angel's Shadow should have in its wings for spars instead of what
> appeared to be white
> foam (bead board stuff).
>
> Another thing to consider is the bi-directional cloths that are
unbalanced,
> which means they
> have a slightly higher thread count (and are stronger) in one direction
than
> the other...lay the stronger
> direction with the higher thread count span wise...
>
> And while I have the stage ;-) when using the really light balsa wood for
> sheeting wings, take each sheet
> by the ends and bend to get a big Uish shape, then reverse
direction....the
> lighter balsa comes from the
> younger trees, which grow fast in storms (swing from side-to-side)....
This
> causes some microscopic
> tears in the very light wood that we can't see! The bending will show
these
> cracks, which are generally
> straight across the grain, as if they were  scored  with a knife.
>
> have fun,
> Amir
>
>
>
>
>
>
>
> > I'm glassing the center section of my Elan.  Using 6 oz/yard K&B cloth
> > and 30 minute epoxy warmed with a heat gun on application.  The epoxy
> > brushes on well and when dry the weave of the cloth is noticeable.  In
> > other words the surface is not a smooth glasslike finish.  Is this OK or
> > do I need more epoxy applied for strength?
> >
> > Thanks,
> > Jerry Wilson
> > Katy,TX
> > NSRCA#3107
> > AMA#119585
> >
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> >
>
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