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<DIV><FONT face=Arial size=2>Matt,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The negative CTE of Kevlar seems as though it would
exaggerate the loosening and tightening of the cables. As the fuse shrinks the
cables will lengthen and visa versa. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>How would this be better than metal
cables?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keith Black</FONT></DIV>
<DIV><FONT face=Arial size=2></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=Rcmaster199@aol.com
href="mailto:Rcmaster199@aol.com">Rcmaster199@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> Tuesday, November 25, 2003 7:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: CTE</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 face=Arial size=2
FAMILY="SANSSERIF">In a message dated 11/25/2003 1:12:08 PM Eastern Standard
Time, <A href="mailto:geobet@gis.net">geobet@gis.net</A> writes:<BR><BR><BR>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"
TYPE="CITE">Subj:<B>Re: CTE </B><BR>Date:11/25/2003 1:12:08 PM Eastern
Standard Time<BR>From:<A
href="mailto:geobet@gis.net">geobet@gis.net</A><BR>Reply-to:<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR>To:<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR><I>Sent from
the Internet </I><BR><BR><BR><BR>Sorry to disagree here, but it would appear
that the conclusion being drawn by the respondants is that the pushrod
expansion and contraction is the major cause of the problem. Not so, in my
experience! Going to pull-pull cables, whether they be steel or kevlar
thread will not get rid of the elevator trim change under consideration
here.The coefficient of thermal expansion between the cables, which is very
small, and the balsa in the fuse, which is significantly greater(glass too)
will generate a differential of sufficient magnitude that the "devil" will
still attack you when you least expect it. <BR>The best solution that I have
observed is to put the servos in the stabs. Short of this, I have been using
servos mounted just at the L.E. of the stab and using a very short
pushrod(approx. 6"). My current thinking is that I will still mount the
servo in the same area and go with cables.Very light and direct. As regards
Kevlar, I currently have a pattern practise ship that I do almost all of my
flying with that has kevlar on the rudder and it has two years of mucho
sequences to it's credit with no apparent wear or abrasions to the thread.
At this point in time I have still not acquired the necessary intestinal
fortitude to use kevlar on the elevator. <BR>Georgie Amir Neshati wrote:
<BR>
<BLOCKQUOTE
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TYPE="CITE">Pull-pull will eliminate the trim change...</FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=3
FAMILY="SANSSERIF"> </FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff"
face=Arial color=#000000 size=2 FAMILY="SANSSERIF">Amir</FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=3
FAMILY="SANSSERIF"> </BLOCKQUOTE><BR></FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2
FAMILY="SANSSERIF"></BLOCKQUOTE><BR><BR>Georgie,<BR><BR>Don't fret it. I have
used Kevlar every where in the tail without problems at all. <BR><BR>BTW
Kevlar has a negative CTE, that is it gets shorter as temp increases. Kevlar
cables actually get a little tighter in summer and looser in Winter, or
opposite what you would expect. I have never had a set-up that retained it's
trim as well <BR><BR>All, I still have a quantity of 40 pound test and 80
pound testTeflon coated Kevlar for sale. These are the smallest profiles
around, for all you discriminating modelers. The teflon coating eliminates the
chafe on composite fuse sides. Contact me directly please<BR><BR>Matt K</FONT>
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