Servo oscillation help

[Jim Ivey]

Tom
I have had similar problems. Since you changed servos,You may have two servos with bad pots or servo gear slop due to wear.Also make sure the pushrod and connectors are slop free on this aileron.This may not be the case.What has happened to me is when you plug and unplug the ailerons every time you assemble the plane,this wears the pin connections in the connectors. The pins get corroded and dirty over time.You can try to clean the pins with a good electronic cleaner (spray),make and break the connectors a few times. Make sure the spray cleaner is plastic friendly.If this solves the problem you need to change the extension.
Hope this helps solve the problem.

Jim Ivey
  
> From: Tom Simes <nsrca at shinymetalass.com>
> Date: 2005/01/27 Thu PM 12:26:25 EST
> To: discussion at nsrca.org
> Subject: Servo oscillation help
> 
> 
> I've got a problem with an aileron servo that I'm hoping the collective
> wisdom here knows an easy remedy for.  On one of my ailerons about one
> in three times when the surface is at neutral if I pluck the aileron or
> let the stick bang back to center, the servo will go into oscillation. 
> A very light pressure or slight stick displacement will stop it, and it
> only occurs when the servo is at center.  As far as I can tell it's
> not happening in flight (my guess is the aerodynamic forces are
> dampening it).  The first time I noticed it, I immediately thought the
> pot had a problem around it's center point so I swapped in a brand new
> servo (same type, Futaba 3004). To my surprise the new servo acted
> exactly the same way, so that lead me to believe the problem is not with
> the servos.  Now my guess is I've somehow perfectly balanced the
> mechanical linkage resistance to the servo's startup force.
> 
> At this point I'm thinking about sealing the aileron gap in hopes of
> changing the mechanical resistance a smidge.  Has anyone else seen or
> solved this problem?
> 
> Thanks!
> 
> -- 
> Tom
> 
> _____________________________________________________________________
> 
>        |  ,  |               Tom Simes
> ---------(@)---------        AMA 230068
>         --|--                NSRCA 3830
>           '                  nsrca at shinymetalass.com
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