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<DIV><FONT face=Arial size=2>Hi Wayne:</FONT></DIV>
<DIV><FONT face=Arial size=2>I would definitely be interested in seenig pictures
of how you do your wings. </FONT></DIV>
<DIV><FONT face=Arial size=2>Thanks!</FONT></DIV>
<DIV><FONT face=Arial size=2>Ed</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=wgalligan@goodsonacura.com
href="mailto:wgalligan@goodsonacura.com">Wayne Galligan</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, December 21, 2004 10:09
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: fiberglass mesh in foam
wings</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>ED,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I can send you some photo's of how I do it when I
get home tonight.</FONT></DIV>
<DIV><FONT face=Arial size=2>The spars, whether they are c.f or glass,
do provide a definite increase in strength. It is important to
have the upper and lower spars directly in line with each other top and
bottom. I also tie the aileron box together with a square of
thin c.f. between the forward and aft spar top and bottom with negligible
weight gain. This has little effect on raising the
balsa and what it does can be sanded smooth. I use urethane
glue and lay up the c.f. strips with the sheeting and cores at one
time. The urethane works great and your wing will be plenty
strong. There are several methods of sheeting and I am sure they
all have their good points.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Wayne G.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Ed_Alt@hotmail.com href="mailto:Ed_Alt@hotmail.com">Ed Alt</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, December 21, 2004 6:39
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> fiberglass mesh in foam
wings</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I'm getting ready to sheet a pair of Temptation
wings and have questions about using the fiberglass screen mesh
reinforcement strips they call for. First, how necessary is it to even
use any? I can see where it obviously adds strength and
stiffness in those sections directly under the mesh, but at the same
time, it will also create a raised-up section of sheeting directly adjacent
to the mesh strip. It seems possible that there would be no bonding of
sheeting to foam for about 1/4" to 1/2" wide all along those seems, at least
not if a thin layer of epoxy is used. It also seems that at the point
where the sheeting does begin to bond with the foam again, it would be
subject to shearing forces that might tend to pop the foam beads out over
time due to bending loads on the panel. Maybe not? I have no
experience with this method, so it's all speculation. It seems that a
fairly heavy application of epoxy would be needed to bond foam to mesh, mesh
to sheeting. Is it possible that the same or better strength result
could be accomplished with a slightly heavier wood selection and still be as
light or lighter than adding mesh and extra glue?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Asuming the mesh is really necessary: The
2nd question is about the adhesive to use if the mesh is used. I
normally use either Pro Bond or Elmers polyurethane glue, which does a
terrific job of bonding several bead layers deep into the core. I
think it probably stiffens the structure alot as a result. However,
it's not clear to me if this would be a good adhesive with the mesh
applied. In theory, it would do a good job of filling that gap I'm
worried about along the mesh edges. Has anyone tried this and are you
happy with the results?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The last question is about how far to run the
aft reinforcement strip. Do you really need to run it all the way to
the tip? At some point, you really get diminishing returns as you get
further out in the panel. Sorry for so many questions!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial
size=2>Ed</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>