[NSRCA-discussion] DS 8411sa Servo Oscillation on Rudder

[Tommy Scarmardo]

I have used 8411sa's on three different airplanes so far without any issues I don't
  know if it makes any difference but I used round Hanger 9 servo wheels on the servo
  with stainless control line cable instead of the regular servo arms. The round wheel
  makes the non pulling wire have slightly less tension when the rudder is moved. It
  doesn't get loose, just very slightly less. Maybe less wear on the servo ??
   
  tommy s

jonlowe at aol.com wrote:
  Thanks to all who responded. I will try the o-ring/rubberband trick, 
though I HATE to add friction! The surface is definitely not heavy in 
this instance, (I have a heavy Impact rudder that I won't use, so I 
know what that is like).

I sent one servo back to Horizon. We will see how it does when I get 
it back. I just got an 8611 I will stick in it for the time being. I 
WAS using Hitec 5945's digital coreless' on rudder, but I thought I'd 
move up! Oh, well!

>From all of the replies, it sounds like this is a chronic issue with 
the 8411s used on rudder, unfortunately.

Thanks again,

Jon

-----Original Message-----
From: bob at toprudder.com
To: nsrca-discussion at lists.nsrca.org
Sent: Thu, 24 Aug 2006 9:53 AM
Subject: Re: [NSRCA-discussion] DS 8411sa Servo Oscillation on Rudder

Dave,
 
There is deadband, and there is dampening. Sounds like the problem, as 
it is related to heavy control surfaces, is dampening.
 
I remember reading Jim Oddino's column in RCM many years ago, where he 
touched on this subject. (I always looked forward to his column, as I 
was just getting into electronics at that time).
 
Bob R.


DaveL322 at comcast.net wrote:
Jon,
 
It is basically a "deadband" issue, which is always a compromise 
- tighter deadband yields more accurate centering but increases the 
probability of oscillation (especially with heavy surfaces as has been 
noted).
 
Since introduced, there have been some minor changes to 8411, but 
Horizon should be able to increase the deadband for you.
 
Regards,

Dave Lockhart, Team JR
DaveL322 at comcast.net

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