8411SA oscillation

[Lance Van Nostrand]

Keith,
It may not stop in the air.  I made that assumption once and after a few weeks with it did a slow fly by and actually saw the rudder flitting around.  Servo was pretty new so I sent it to Horizon and they adjusted the dead band and returned it.  Still using it.
--Lance

  ----- Original Message ----- 
  From: Keith Black 
  To: discussion at nsrca.org 
  Sent: Sunday, August 22, 2004 11:24 PM
  Subject: 8411SA oscillation


  I have a new JR 8411SA on the rudder of my new plane and it frequently oscillates back and forth.

  In the past I've experienced oscillation problems on the rudder using a JR 8411SA, however when this has occurred in the past (with a relatively new servo) it normally indicated that the pull-pull cables are a bit loose and tightening them will solve the problem.

  However, in this case I've tightened the cables quite a bit tighter than my other plane and still have the oscillation problem even with the new servo. If I touch the rudder with my hand it will stop, and I can also stop it by moving the stick back and forth a couple of times very slowly. However, any quick moves of the rudder stick to center, or when the plane is first turned on will result in the oscillation.

  As far as flying goes, I imagine that the prop wash normally stops the oscillation, much like putting my hand on the rudder, but the fact that this occurs so much and my other plane doesn't often have this problem is somewhat troubling.

  Any suggestions or advice?

  Thanks,
  Keith Black
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