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<DIV><FONT size=2>There's a case where a spring tensioning system might
help....</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Which would be heavier? The change to wood pushrod or
the spring tensioning system putting the servo on rails and that pulley trick to
take side-load off the servo output shaft?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Just what would it take to beef up the rudder hinge at the
control horn to deal with the tension? (spring tension = servo rated torque to
prevent slack line under flight loads)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>**********</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>There's a trick with a spring in-line that is used in some
boat steering setups (I've seen it in person-carrying runabouts) Keeps the
cables tight but allows for differential expansion of the hull vs the
cables... Not a total cure for the differential expansion load on the
servo, but it would be an improvement vs the case that pulled a servo
apart. If appropriate springs could be found, it would be
light.</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=natpenton@centurytel.net href="mailto:natpenton@centurytel.net">Nat
Penton</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> Thursday, January 11, 2007 9:08
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] Controll
Systems</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I'm probably the originator of the
.070 carbon-dep system - about 86. Carbon/balsa fuses and kevlar/balsa
fuses , are poor combinations, and I'm still using them. Both
systems are vulnerable to temp and/or humidity changes and are a pain. Since
I've been doing this since 86 I must be a slow learner. No slop but sometimes
a trim change every hour.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>With balsa fuses, for elev, I plan to go (back)
to a balsa dowell pushrod and use a crossover ( MK, or custom ? ) just in
front of the stab. Not sure how to handle the rudder, two small hard balsa
dowells ? I've had undue kevlar tension ruin two DS8411sa servos on an
electric.
Nat</FONT></DIV>
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