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<DIV>Bob, originally I had my Temptress' elevator set-up on pull-pull (K-Kord, my stuff) and experienced practically no drift in elevator trim. One day, one of crimps I was using pulled apart. It really wasn't a big deal to land on one elevator half. The other half only allowed down command so it wasn't really trivial matter but wasn't terribly serious either. Note Temptress uses a Temptation fuse.</DIV>
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<DIV>Rather than replacing the K-Kord, I decided at that time to try the carbon pushrod arrangement that CST sells that is similar to a DEPS. I have been experiencing exactly what you describe ever since. Not exactly the identical set-up you have but the materials used are very similar.</DIV>
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<DIV>Usually, once the plane is trimmed at the start of the flying session, it doesn't drift the rest of the day but still I don't care much for that arrangement and will replace the carbon with pull-pull again. I will probably never use full length carbon rods again unless the fuse is carbon also.</DIV>
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<DIV>FWIW</DIV>
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<DIV>Matt</DIV> <BR>-----Original Message-----<BR>From: Bob Kane <getterflash@yahoo.com><BR>To: nsrca-discussion@lists.nsrca.org<BR>Sent: Mon, 8 May 2006 08:04:04 -0700 (PDT)<BR>Subject: [NSRCA-discussion] Elevator trim change<BR><BR>
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<DIV class=AOLPlainTextBody id=AOLMsgPart_0_9a859142-fd1e-4b5d-8025-55938399e397><PRE><TT>My new Temptation is using a carbon pushrod system for
the elevator. The length is roughly 30" and it is all
carbon from the servo to the elevator horns except for
the titanium ends.
I have been experiencing significant (more on what I
consider significant later) trim changes in elevator
from one flight to another. I did some searching in
the RCU forums and found a two year old thread, the
conclusion (if there is such a thing in online forums)
is the expansion/contraction of the composite fuselage
is large relative to the change of a carbon pushrod
system if both are subjected to the same change in
temperature.
What I mean by significant is two or three clicks as
measured by my Stylus trim levers. My three previous
pattern planes all featured rear mounted elevator
servos with short (< 12") pushrod systems. These
planes exhibited little trim change (1 click) with
temperature swings.
I changed servos last night and will be test flying
this evening to see if the servo was contributing to
the trim change.
What are other experiences with carbon
pushrod/composite fuselage combinations?
Bob Kane
<A href="mailto:getterflash%40yahoo.com">getterflash@yahoo.com</A>
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