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<DIV><SPAN class=265505002-28072005>IMO, the best way to save a couple of ounces
is by careful wood selection of contest grade balsa resulting in less
compromise of wing integrity.</SPAN></DIV>
<DIV><SPAN class=265505002-28072005>Dave</SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org]<B>On Behalf
Of </B>David Lockhart<BR><B>Sent:</B> Wednesday, July 27, 2005 10:44
PM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> Re: Foam Honey-Coming
Weight savings<BR><BR></FONT></DIV>
<DIV>With regard to the weight savings of the glue that has been mentioned by
several people..............you can save the glue weight whether you honeycomb
or not.</DIV>
<DIV> </DIV>
<DIV>I've done wings both ways - to me, it is clearly not worth the fuss on
thin airfoils (or stabs, or rudders/fins). I use the same amount of glue
either way, so even on the fatter wings, the weight savings is at most 1 oz
per panel - and without a doubt, the wing becomes more prone to damage from
hanger rash.</DIV>
<DIV> </DIV>
<DIV>Dave</DIV>
<DIV> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=AtwoodDon@aol.com
href="mailto:AtwoodDon@aol.com">AtwoodDon@aol.com</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> Wednesday, July 27, 2005 10:30
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Foam Honey-Coming Weight
savings</DIV>
<DIV><BR></DIV><FONT id=role_document face=Arial color=#000000>
<DIV>
<DIV>The amount of weight saved by honeycombing a wing is more than the foam
weight. It is a combination of the foam weight and the epoxy or
adhesive you don't use in those areas. Once the foam is honeycombed,
take the template and very lightly mark the outline of the honeycomb on the
inside of each wing skin. Then only apply adhesive to the areas of the
balsa skin that will contact the foam. The combination of the foam
weight reduction as well as the reduced adhesive will give you the greatest
reduction. Admittedly, the reduction is not large but when you
consider reducing an ounce in a 11 or 12 oz wing panel, the percentage is
respectable.</DIV>
<DIV> </DIV>
<DIV>Don Atwood</DIV>
<DIV> </DIV>
<DIV>you have the wing honeycombed, In a message dated 7/27/2005 7:22:37
P.M. Pacific Daylight Time, kerlock@comcast.net writes:</DIV>
<BLOCKQUOTE style="PADDING-LEFT: 0px; MARGIN-LEFT: 0px"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000>
<DIV><FONT face=Arial>Yup a little.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Whether it's worth it or not totally depends on the
amount of weight you're looking for. Actually cutting the honeycomb isn't
too difficult or time consuming, but making the templates can be a little
painstaking. However once you have them, you have them for a few
planes.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I am currently running a fairly thick tip section,
and performed honeycombing on the outer half of the wing panel past the
spars. It saved about an ounce per panel compared to the first set I made.
So, you save a couple of ounces, and remove some mass from your wingtips.
Does it help? I'm sure it doesn't hurt, and theoretically (being the
operative word) it can help in dampening snaps and spins...but not a lot,
unless your tips are really heavy to begin with. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>If you're building an electric or a plane that
historically comes out close to the limit, it could be worth the effort.
I'm not sure it's worth it on a 10 lb or less plane.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Just my 2 cents.</FONT></DIV>
<DIV><FONT face=Arial>-Mike</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mailto:Jim_Woodward@beaerospace.com
href="mailto:Jim_Woodward@beaerospace.com">Jim_Woodward@beaerospace.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=mailto:discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, July 27, 2005 4:46
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Foam Honey-Coming Weight
savings</DIV>
<DIV><BR></DIV><BR><FONT face=sans-serif>Hi Guys,</FONT> <BR><BR><FONT
face=sans-serif>Does anyone happen to have some experience in weight
reductions from foam honey-combing? Wing cores, stab cores,
vertical fin and rudder cores? Maybe a 25% weight
reduction?</FONT> <BR><BR><FONT face=sans-serif>Thanks,</FONT> <BR><FONT
face=sans-serif>Jim W.</FONT> </BLOCKQUOTE></FONT></BLOCKQUOTE></DIV>
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