Excess Aileron sensitivity around neutral

[Amir Neshati]

A couple of notes, squared off/thicker TE is more responsive than a sharper/thin TE, with a hint
more drag, like 1 or 2%......What ever you do, don't round off the TE,  does funky things to lift.
I flew a 2 meter bird with a sharp TE down to 1/64" and didn't have  the sensitivity issues at center.
On lower Reynolds Numbers models, a sharper/thin TE can be an issue with not enough authority 
around center...as in too mushy, and Viagra won't help either.


In order to be helpful to you, it would really be best to see things in person, there may be stuff missed, 
so why don't you fly a couple of us out there and we should figure it out after a 100 flights or so on your plane ;-)

Amir


  ----- Original Message ----- 
  From: paul 
  To: discussion at nsrca.org 
  Sent: Monday, December 05, 2005 8:10 AM
  Subject: Re: Excess Aileron sensitivity around neutral


      Oops, when I said the ailerons were OK at full throttle I meant to describe that the aileron authority was not excessive, not that the excessive sensitivity is speed or throttle related - it is not.  Sorry I was not more specific.
      Some more details:
  * Servos are two digital 9252s, should be plenty of torque and have excellent resolution around neutral - no pot problems.
  * Linkage is carbon fiber rod and no slop.
  * Expo is - 45% to reduce the twich.  ATV is 100 % high rate 90% low 75% (normally high would be 100% but is dialed down while working this problem).
  * Airframe - no loose covering, clevis pin is over hinge line at neutral, servo arm and control horn are 90 degrees at neutral (control geometry).  CG is rearward but not tail heavy - pitch is not twichy. 
  * have not measured  wing and stab incidence angles.

  *** one thing that Del mentioned - Aileron trailing edge (and wing) taper to a very sharp radius ~ 3/32 to 1/8 inch.

  Thanks,
  Paul
    ----- Original Message ----- 
    From: paul 
    To: discussion at nsrca.org 
    Sent: Sunday, December 04, 2005 5:26 PM
    Subject: Excess Aileron sensitivity around neutral


        I have a Meridian with a frustrating characteristic, the ailerons are excessively sensitive around neutral.
    I'm the second owner of this plane but the first owner said he had the same problem.  Aileron authority at full throttle is not excessive - in fact it slightly on the mild side.    
    Any ideas ?
    Thanks,
    Paul
    NSRCA 3606
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