[NSRCA-discussion] Elevator trim change

[mike mueller]

 That's when having 2 planes flying with the same Transmitter really helps. 

John Ferrell <johnferrell at earthlink.net> wrote:  Beware of worn pot in transmitter, very hard to identify...

John Ferrell W8CCW
"My Competition is not my enemy"
http://DixieNC.US

----- Original Message ----- 
From: "Bob Kane" 
To: 
Sent: Monday, May 08, 2006 11:04 AM
Subject: [NSRCA-discussion] Elevator trim change


> 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
> getterflash at yahoo.com
> 
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