Interesting incidence question

[Bob Pastorello]

A long time ago, I was using a Robart meter that wasn't "zeroed" mechanically (hard to tell because of the magnifying lens/small scale markings, etc.) that would read positive on ONE side, and negative on the other....when I installed it the same way on each stab or wing panel, it read the same...meaning that if I had the meter facing the outside tip of the wing on the Left panel, when I moved to the RIght panel, the meter faced the fuselage.
    Measurement problems vanished.

Not saying this is your situation, Anthony, but could be something worth checking.

Bob Pastorello
rcaerobob at cox.net
www.rcaerobats.net


  ----- Original Message ----- 
  From: William C. Harden 
  To: discussion at nsrca.org 
  Sent: Saturday, September 18, 2004 9:33 PM
  Subject: RE: Interesting incidence question


  Anthony,

   

  It's unfortunate, but there is no way you can live with the stab halves not aligned with each other.  If the stabs are to be at zero degrees, then both stabs will have to be removed and remounted at zero degrees.  If you don't do this you will never have a properly trimmed plane and you'll just hate the way it flies.  Bite the bullet and remount the stabs correctly.

   

  Bill

   

   

   

   

  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Anthony Abdullah
  Sent: Saturday, September 18, 2004 7:24 PM
  To: discussion at nsrca.org
  Subject: Interesting incidence question

   

  Hello all


  I have a question concerning wing and stab incidence.

   

  This is what I have to work with.

  Stabs are mounted and are not adjustable. The wing is not mounted but will not be adjustable. The plans say the the wing should be at positive 2 degrees to whatever the stabs are (preferably 0). If the left stab is at -1 degree and the right is at + 1 degree, what incidence should the wings be mounted at to minimize trim and flight problems?

   

  Should the left wing be positive 1 degree and the right 3 degrees, or should I just make the wings the same to match either of the stabs? I am considering mounting the wings both at + 1 but not quite sure how that would affect flight.

   

  I am very interested to hear what you guys think, or suggest as a possible course of action. It is not a pattern plane, I got it partially completed and I'm not really looking to go into a complete rebuild, I would just like to minimize trim problems so it will fly OK.

   

  Thanks a ton guys.

  Anthony   
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