[NSRCA-discussion] Elevator trim change

[Don Ramsey]

I have the same changes on both composite and wood frame models.


Don

----- Original Message ----- 
From: "Glenn Hatfield" <randy10926 at comtekmail.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Monday, May 08, 2006 10:39 AM
Subject: Re: [NSRCA-discussion] Elevator trim change


> Yes.  Many of us have this issue; even with wood planes using carbon-fiber 
> push rods. As you noted the expansion rates are different.
>
> Randy
>
> --- getterflash at yahoo.com wrote:
>
> From: Bob Kane <getterflash at yahoo.com>
> To: nsrca-discussion at lists.nsrca.org
> Subject: [NSRCA-discussion] Elevator trim change
> Date: Mon, 8 May 2006 08:04:04 -0700 (PDT)
>
> 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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