<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.2802" name=GENERATOR></HEAD>
<BODY bgColor=#ffffff>
<DIV><SPAN class=810145814-29032006><FONT face=Arial color=#0000ff size=2>Hi
Don,</FONT></SPAN></DIV>
<DIV><SPAN class=810145814-29032006><FONT face=Arial color=#0000ff size=2>You
have to love that Oddessey of the Mind program.</FONT></SPAN></DIV>
<DIV><SPAN class=810145814-29032006><FONT face=Arial color=#0000ff size=2>I
taught basic indoor rubber trimming to the boss's son, last year for the
airplane project.</FONT></SPAN></DIV>
<DIV><SPAN class=810145814-29032006><FONT face=Arial color=#0000ff size=2>That's
another good article idea.</FONT></SPAN></DIV>
<DIV><SPAN class=810145814-29032006><FONT face=Arial color=#0000ff
size=2>Dean</FONT></SPAN></DIV>
<DIV> </DIV>
<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT
face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT
face="Times New Roman">Kodeos Communications</FONT> <BR><FONT
face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT
face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT
face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT
face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT
face="Times New Roman">d.pappas@kodeos.com</FONT> </P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Don
Ramsey<BR><B>Sent:</B> Wednesday, March 29, 2006 9:52 AM<BR><B>To:</B> NSRCA
Mailing List<BR><B>Subject:</B> Re: [NSRCA-discussion] An education in balsa
usage for pattern<BR><BR></FONT></DIV>
<DIV><FONT size=2>My daughter, in a high school class, built a bridge using
1/4 sq balsa. She still holds the record at her school. The bridge
was 12 inches long, 1 inch wide, weighed 14 grams and supported 70.5 lbs hung
under the bridge. Last year the max weight held was 42 lbs.
She did use good techniques in the construction but with a little more testing
she could have gone much higher.. I've seen balsa towers 12 inches tall
weighing in the 15 gram range hold over 300 lbs in compression.</FONT></DIV>
<BLOCKQUOTE
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=wgalligan@goodsonacura.com
href="mailto:wgalligan@goodsonacura.com">Wayne Galligan</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, March 29, 2006 8:35
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] An
education in balsa usage for pattern</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Matt,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>My son did his 5th grade science project using
balsa construction. His project was to determine what bridge truss
design held the most weight for a given span. It was truly amazing how
much weight the structure would hold. The spans he built
where 7"x7"x24" and weighted 1.5 oz, made of 1/4" square med grade
balsa glued together with thin c/a. The Warren truss held 42 lbs
before collapsing and the two other structures were close behind holding 32
to 38 lbs. It was a learning experience for both of us. It gave
me a better understanding of how certain truss structure builds stiffness,
strength and be light weight. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Wayne Galligan</FONT></DIV>
<BLOCKQUOTE
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=rcmaster199@aol.com
href="mailto:rcmaster199@aol.com">rcmaster199@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, March 28, 2006 6:58
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] An
education in balsa usage for pattern</DIV>
<DIV><BR></DIV>
<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana'">
<DIV>
<DIV>Balsa is pretty amazing stuff overall, particularly for a natural
material. The Xylem that makes up much of the superstructure of any wood
(that's what we commonly hear as grain), is essentially a huge number
of tubes arrayed side by side, but interconnected along the length. The
tubes serve a terrific function in the long direction and the
interconnects make the structure have reasonable transverse strength as
well. </DIV>
<DIV> </DIV>
<DIV>The closest thing manmade that will surpass it in terms of mechanical
strength vs flex vs weight vs cost will likely be Buckytube if
you excluded the cost. That's just in laboratories now, being made in very
small quantities supporting very high end applications. This stuff is
the true unobtainium that some have complained about. But that's another
subject.</DIV>
<DIV> </DIV>
<DIV>There used to be an annual competition in colleges where a very
small, known quantity of balsa and glue were used creatively by students
to build some kind of support structure like a small bridge. These things
would hold unbelievable amounts of weight. </DIV>
<DIV> </DIV>
<DIV>Alas, the weakness is shock loading. </DIV>
<DIV> </DIV>
<DIV>Matt</DIV> <BR>-----Original Message-----<BR>From: Adam Glatt
<adam.g@sasktel.net><BR>To: NSRCA Mailing List
<nsrca-discussion@lists.nsrca.org><BR>Sent: Tue, 28 Mar 2006
16:44:02 -0600<BR>Subject: Re: [NSRCA-discussion] An education in balsa
usage for pattern<BR><BR>
<STYLE>.AOLPlainTextBody {
FONT-SIZE: 12px; MARGIN: 0px; COLOR: #000; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; BACKGROUND-COLOR: #fff
}
.AOLPlainTextBody PRE {
FONT-SIZE: 9pt
}
.AOLInlineAttachment {
MARGIN: 10px
}
.AOLAttachmentHeader {
BACKGROUND: #f9f9f9; BORDER-BOTTOM: #e9eaeb 2px solid
}
.AOLAttachmentHeader .Title {
PADDING-RIGHT: 0px; PADDING-LEFT: 10px; BACKGROUND: #e9eaeb; PADDING-BOTTOM: 1px; FONT: bold 11px Tahoma; COLOR: #666666; PADDING-TOP: 3px
}
.AOLAttachmentHeader .FieldLabel {
PADDING-RIGHT: 10px; PADDING-LEFT: 9px; PADDING-BOTTOM: 1px; FONT: bold 11px Tahoma; COLOR: #666666; PADDING-TOP: 1px
}
.AOLAttachmentHeader .FieldValue {
FONT: 11px Tahoma; COLOR: #333333
}
</STYLE>
<DIV class=AOLPlainTextBody
id=AOLMsgPart_0_a3a3b4df-d994-412a-a29e-2c471d7b45f7><PRE><TT>Not directly applicable to pattern, but certainly a good start:
Buy and build a Stevens Aeromodel kit. The planes are small (35-50"
span, 1-2.5lbs) and electric powered. I'm about 1/2 done building the
Edge 540, and am actually enjoying the build because I am constantly in
awe of the genius wood design and its results (consider that this Edge
540 is 40-sized, but will weigh only 2lbs with more performance than all
but the most dedicated 40-sized 3D glow planes).
-Adam
White, Chris wrote:
>
> Can anyone tell me where a person can get a "Crash" course in learning
> about balsa weights and strength and its proper use in balsa pattern
> models.
>
> I notice a few years ago that in the 99 world champs most of the
> Japanese pilots models were balsa and light weight too. It seems that
> everything I read of late seems to indicate that light weight and
> strength only come with composite construction.
>
> Thanks..Chris
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> NSRCA-discussion mailing list
> <A href="mailto:NSRCA-discussion%40lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</A>
> <A href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A>
>
_______________________________________________
NSRCA-discussion mailing list
<A href="mailto:NSRCA-discussion%40lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</A>
<A href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A>
</TT></PRE></DIV><!-- end of AOLMsgPart_0_a3a3b4df-d994-412a-a29e-2c471d7b45f7 --></DIV></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>NSRCA-discussion
mailing
list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE>
<P>
<HR>
<P></P>_______________________________________________<BR>NSRCA-discussion
mailing
list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>