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

[Wayne]

No they are all figuring out how much to cut off their antenna so their 
models won't glitch and crash. After all the new RX is so sensitive that you 
need to cut off exactly to a specific length or it might pick up the young 
and the restless. If that happens oh man your model is going to do a new 
version of a humpty bump. The good news is you can watch the video on the 
screen as your model does the ground bump.

The 10X needs an update its long overdue. I hope JR is listening

----- Original Message ----- 
From: <jonlowe at aol.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Thursday, August 24, 2006 12:47 PM
Subject: Re: [NSRCA-discussion] DS 8411sa Servo Oscillation on Rudder


>I was wondering when the FOO TAW BAH crowd would show up!  I figured
> they were all busy trying to figure out how to program their 14MZs
> which still aren't as easy as a 10x  ;)
>
> Jon
>
> -----Original Message-----
> From: jim.woodward at schroth.com
> To: nsrca-discussion at lists.nsrca.org
> Sent: Thu, 24 Aug 2006 11:28 AM
> Subject: Re: [NSRCA-discussion] DS 8411sa Servo Oscillation on Rudder
>
> I get a kick out of these threads about installing new JR gear sets,
> and we
> can now add, using rubberbands on them. :)
>
> Jim W.
> Team Futaba
>
>
>
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
> jonlowe at aol.com
> Sent: Thursday, August 24, 2006 12:21 PM
> To: nsrca-discussion at lists.nsrca.org
> Subject: Re: [NSRCA-discussion] DS 8411sa Servo Oscillation on Rudder
>
> Jim,
> This only manifests itself at neutral, and both cables are tight.
> Nothing is slipping, and I don't use ferrules.  In this particular
> case, I don't see how ackerman would be involved.
>
> Jon
>
> -----Original Message-----
> From: jivey61 at bellsouth.net
> To: nsrca-discussion at lists.nsrca.org
> Sent: Thu, 24 Aug 2006 7:21 AM
> Subject: Re: [NSRCA-discussion] DS 8411sa Servo Oscillation on Rudder
>
> Jon
> Read this about pull-pull.
> This will also happen if your cable ends slip. If you put the cable
> through the ferrule just one time it may be slipping. Bad geometry will
> cause this also.
>
> Jim Ivey
>
>
>
> http://members.cox.net/bdfelice/Ackerman/ackerman.htm
> ----- Original Message -----
> From: JonLowe at aol.com
> To: nsrca-discussion at lists.nsrca.org
> Sent: Thursday, August 24, 2006 7:38 AM
> Subject: [NSRCA-discussion] DS 8411sa Servo Oscillation on Rudder
>
>
> I'm running a JR 8411sa on rudder on my Aggressor, pull-pull, using the
> setup that Troy Newman recommends (ss control line cable, NMP links at
> the servo end, and MK links at the rudder, etc.). For the first 75 or
> so flights, I had no issues. Then, the servo started self oscillating
> around neutral, even with the engine not running, on the ground if the
> rudder stick was bumped. The surface buzzes back and forth about 1/4",
> until damped out by grabbing the surface. Thinking it was a servo pot
> going bad, I changed out the servo. After two or three flights, same
> problem appeared. Then thinking it must be a natural frequency issue
> in the linkage exciting the feedback loop in the servo, I tightened up
> on the pull-pull somewhat. It wasn't loose before (these cables, as
> Troy says, don't stretch at all), but I increased tension somewhat.
> That helped for about 3 flights, then the problem reappeared. These
> servos are new 8411's, self converted to SA with a new plastic gear
> package. I've gone thru the linkage completely, and find no evidence
> of anything amiss. I've changed nothing in the setup from the
> first flight.
>
> I believe I read somewhere in the past, about some 8411's doing this
> because the feedback loop in the servo was too tight, and could be
> corrected by sending them back to Horizon. Can anyone shed some light
> on this? I'm about to install an 8611 on rudder, but would like to
> track down this issue with the 8411s.
>
> Thanks.
>
> Jon Lowe
>
>
>
> --------
>
>
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