<HTML><FONT FACE=arial,helvetica><FONT SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">In a message dated 11/25/2003 5:14:27 PM Eastern Standard Time, perkinsrx@centurytel.net writes:<BR>
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<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Subj:<B>Re: CTE </B><BR>
Date:11/25/2003 5:14:27 PM Eastern Standard Time<BR>
From:<A HREF="mailto:perkinsrx@centurytel.net">perkinsrx@centurytel.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>
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I see a reference to 40# Kevlar, which triggers a question. </FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">What strength Kevlar is needed. The airplane pull-pull system I've seen state 100#. I've read you can use Spiderwire fishing Kevlar but the strongest I've seen in that is 65#.</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">This may be a dumb question, but I'm attempting to setup elevator pull-pull for the 1st time & don't want to creat a problem with line that's too small.</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">thanks Eddie</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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For pattern planes, 40 pound line is overkill by a wide margin. Several people are using my 40 lb PTFE coated Kevlar material on their larger 1/3 and 40% models. But it's difficult to make the line really small; around 40 pound test is easy to get<BR>
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Typically it's hard to find smaller yarn than around 100 denier, that is cost effective. DuPont makes some pretty small denier yarn but even I can't get it easily. 400 dn yarn is fairly readily available and a few strands of this material are braided or twisted to make the necessary cable stock. But this material will have terrific strength and toughness, in the several dozen pounds pull area. <BR>
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Consider that one end of 400 dn yarn has a diameter of around .010" and around 25 pounds break strength. Four of these twisted together will be in the 80 to 100 pounds break area, hence the 40 pound test. <BR>
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One more thing, carbon is considerably stronger than Kevlar weight for weight. However carbon doesn't have the leather-like toughness and resiliency of Kevlar and is no good as a pull cable unless it's in a carrier matrix.<BR>
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MattK</FONT></HTML>