[NSRCA-discussion] Trim changes

[Jerry Jackson]

I side with Keith.  Your idea results in the elasticity/deadband of the linkage being inside the feedback loop and those effects were not accounted for when the designers chose stability parameters.  Results--- I'll bet the servos oscillate like mad.

JJ
  ----- Original Message ----- 
  From: Keith Hoard 
  To: NSRCA Mailing List 
  Sent: Wednesday, December 06, 2006 12:13 PM
  Subject: Re: [NSRCA-discussion] Trim changes


  If you mount the rest of the servo along with the pot!!!


  On 12/6/06, Brian Billings <auto7832 at bellsouth.net> wrote: 
    I have been dealing with elevator trim changes on my D.E.P.S. installation which has been worse with cold mornings and warm afternoons. Last night on the way home from the field I got the idea of figuring out a way to take the pot out of the servo and mounting it on the control surface, that way the surface will always go to it's set position regardless of how much the fuse has expanded or contracted. Anybody ever try this, I know it could be done but is it practical? My worry is vibration, sealing the pot from the elements, oil, keeping a clean signal with the long leads to the rear and a positive connection from pot to surface. Is this a dumb Idea? 



    Brian  


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  -- 

  Keith Hoard
  Collierville, TN
  khoard at gmail.com




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