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Joe:  Interesting problem, and one that we encountered on Gary Sorensen's ES,
but don't know if he has fixed it yet.  A concern for his was Rudder balance,
and trim tab tightness.
 
When did all this start, ie: what did you change or has it always done this ?

In your case I might suggest removing the rudder gap seal. Ensure there is
"zero" lateral slop in the trim tab.  To help the slop in the MS hinge and
linkage put a layer of duct tape across the tab hinge shich will help  
stabilize it's movement (temporary).   Do you have the stall strips installed
??  
Jack up the nose  and ensure that the strut is "locked" in the center cam,
and that there is no slop in the fairing which can cause a yaw moment?  Check
the mains too..  Remove the nose gear fairing and flight test it.  Are the
main gear leg fairings (airfoil) captured so that they can't twist and change
the drag effect?  

Just a little brain storming, hopefully it produces some answers you'll share
with us all.

Mike DeHate
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Please send your photos and drawings to marvkaye@olsusa.com.
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