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<DIV><SPAN class=140412310-23082004><FONT face=Arial color=#0000ff size=2>I had
the same problem not too long ago. Turned out the tail wheel steering
spring was just strong enough to sustain the oscillations. The fix was to
remove the spring and install a piece of yellow nyrod for a tiller.
</FONT></SPAN></DIV>
<DIV><SPAN class=140412310-23082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=140412310-23082004><FONT face=Arial color=#0000ff size=2>I've
also seen pieces of foam installed under the rudder servo control horn to
provide some dampening.</FONT></SPAN></DIV>
<DIV><SPAN class=140412310-23082004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=140412310-23082004><FONT face=Arial color=#0000ff
size=2>Scott</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org]<B>On Behalf Of </B>Keith
Black<BR><B>Sent:</B> Monday, August 23, 2004 12:24 AM<BR><B>To:</B>
discussion@nsrca.org<BR><B>Subject:</B> 8411SA
oscillation<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2><FONT size=2>
<P>I have a new JR 8411SA on the rudder of my new plane and it frequently
oscillates back and forth.</P>
<P>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.</P>
<P>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.</P>
<P>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.</P>
<P>Any suggestions or advice?</P>
<P>Thanks,<BR>Keith Black</P></FONT></FONT></DIV></BLOCKQUOTE></BODY></HTML>