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<DIV>Brian, I didn't realize that some outer tubes were different plastic that
PTFE Teflon. Carbon fiber normally has a low coefficent of friction,
however, the binder material is usually a vinyl ester which has high
cof. When that comes in contact with most common plastics like nylon for
example, friction can get too much for our purposes.</DIV>
<DIV> </DIV>
<DIV>Best outer sheath material is PTFE (teflon), bar none. PTFE has the lowest
CoF of any plastic. Only way to make it better is to extrude teflon with ridges
in the ID, reducing the contact area (sort of reverse nyrod). </DIV>
<DIV> </DIV>
<DIV>BTW, Hobby Lobby sells steel threaded couplers (not the more common brass
we see from others) that will work great with this size carbon rod. Slip the rod
in place and Epoxy it in.</DIV>
<DIV> </DIV>
<DIV>Matt</DIV>
<DIV> </DIV>
<DIV> n:34:54 PM Eastern Standard Time, auto7832@bellsouth.net
writes:</DIV>
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<DIV><FONT face=Arial size=2>Speaking of the CF push rod set ups, I would like
to share a little info. I just finished installing my second CF. elev. pushrod
assem. in a Impact, the first was in my Majestic. In the Majestic I got the
DEPS setup from CST seen here <A
title=http://www.cstsales.com/CCPush-rodKits.htm
href="http://www.cstsales.com/CCPush-rodKits.htm">http://www.cstsales.com/CCPush-rodKits.htm</A></FONT></DIV>
<DIV><FONT face=Arial size=2>This kit comes with a thin walled Teflon outer
case and even with a slight bow or arc in the assem. the system remains
Very friction free.</FONT></DIV>
<DIV><FONT face=Arial size=2>For the Impact I purchased the kit from
Central and it comes with plastic outer cases and these were difficult to
get smooth and friction free, the slightest bend or arc made the movement very
stiff and as a matter of fact, I could not even use them and ended up using
hollow CF. rod for the outer case which worked very well but slight bends or
arcs are out of the question. Just my personal experience, yours may
differ.</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=mailto:wgalligan@goodsonacura.com
href="mailto:wgalligan@goodsonacura.com">Wayne Galligan</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> Thursday, February 03, 2005 4:49
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: MK Dual Elavator Bellcrank
& Pushrod?</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I am in the middle of a major on mine
and if it shows any signs of fatigue am going with the pull/pull like Matt
described. I all ready have my servo sideways so why not? And
save a few grams in the process.</FONT></DIV>
<DIV><FONT face=Arial size=2>Still the slickest way and most worry free is
the .070 dual c.f. rods. And that will be the way I set up any
new plane in the future.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>WG<BR></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=mailto:d.pappas@kodeos.com href="mailto:d.pappas@kodeos.com">Dean
Pappas</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> Thursday, February 03, 2005
3:25 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: MK Dual Elavator
Bellcrank & Pushrod?</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=726502421-03022005><FONT face=Arial color=#0000ff
size=2>That makes you want to run cables in full length guide
tubes.</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"><A title=mailto:d.pappas@kodeos.com
href="mailto:d.pappas@kodeos.com">d.pappas@kodeos.com</A></FONT> </P>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> <A
title=mailto:discussion-request@nsrca.org
href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</A>
[mailto:discussion-request@nsrca.org]<B>On Behalf Of </B>Wayne
Galligan<BR><B>Sent:</B> Thursday, February 03, 2005 4:24
PM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> Re: MK Dual
Elavator Bellcrank & Pushrod?<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>I took a (2) pieces of foam about 2"sq x 4"
long and pushed them onto the c.f rod and placed them about 6 inches
from each end. I could then move the pieces back and forth
to tune out the harmonic resonants. Just watch the rod at various
engine speeds to see what it does. When it vibrates it is amazing
that any of them would hold together. </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=mailto:rickwallace45@hotmail.com
href="mailto:rickwallace45@hotmail.com">Rick Wallace</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> Thursday, February 03, 2005
11:43 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: MK Dual Elavator
Bellcrank & Pushrod?</DIV>
<DIV><BR></DIV>
<DIV>
<DIV class=RTE>
<P>Agree w/ John about using foam as a vibration damper. Also, someone
much wiser than me pointed out that whatever is installed should NOT
be halfway, 1/4 way, or any reasonable fraction of the pushrod
length because these may end up as stationary nodes in the
vibrating rod, and end up doing no good. </P>
<P>Rick<BR><BR></P></DIV>
<DIV></DIV>>From: "John Ferrell" <<A
title=mailto:johnferrell@earthlink.net
href="mailto:johnferrell@earthlink.net">johnferrell@earthlink.net</A>>
<DIV></DIV>>Reply-To: discussion@nsrca.org
<DIV></DIV>>To: <discussion@nsrca.org>
<DIV></DIV>>Subject: Re: MK Dual Elavator Bellcrank & Pushrod?
<DIV></DIV>>Date: Thu, 3 Feb 2005 09:07:36 -0500
<DIV></DIV>>
<DIV></DIV>>Be very careful about alignment. An extra bushing on
the shaft can cause a lock up under vibration.
<DIV></DIV>>A foam rubber damper is safer. It can be as simple as a
wad of foam or as complicated as another bulkhead.
<DIV></DIV>>
<DIV></DIV>>John Ferrell
<DIV></DIV>>http://DixieNC.US
<DIV></DIV>>
<DIV></DIV>> ----- Original Message -----
<DIV></DIV>> From: Jerry Wilson
<DIV></DIV>> To: discussion@nsrca.org
<DIV></DIV>> Sent: Wednesday, February 02, 2005 10:59
PM
<DIV></DIV>> Subject: MK Dual Elavator Bellcrank &
Pushrod?
<DIV></DIV>>
<DIV></DIV>>
<DIV></DIV>> I've mounted the bellcrank and will use
Central's carbon fiber push rod. The pushrod length from
servo to crank is about 28".
<DIV></DIV>>
<DIV></DIV>>
<DIV></DIV>>
<DIV></DIV>> Is it necessary to install a support of
the rod halfway down the fuselage to prevent
flexing. And if so does anyone have a simple way of doing
this inside a fiberglass fuselage?
<DIV></DIV>>
<DIV></DIV>>
<DIV></DIV>>
<DIV></DIV>> TIA
<DIV></DIV>>
<DIV></DIV>> Jerry
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