[NSRCA-discussion] Trimming question.

[george w. kennie]

Colin,
To me it sounds like whatever degree of positive incidence is in your wing is producing a greater amount of lift in the denser air causing you to trim out the increase with the additional down elevator which, in turn, is causing the belly pitch. We know that you have to have 1G positive to sustain level flight so why wouldn't this be a normal flight reactive condition? Further, if you have your trim step adjustment set at "one", then four beeps is still a very small trim adjustment. Now the thing I'm not sure of is, if the positive incidence is overly exagerated do the resulting corrections become exponential in their effects, but I would expect this to not be the case. If your at a "one increment" trim step programming adjustment, then I think your experiencing a normal reaction, or you can make a New Year's resolution to not fly in the cool weather. 
Good Luck, 
Georgie

  ----- Original Message ----- 
  From: colin chariandy 
  To: NSRCA Mailing List 
  Sent: Monday, September 11, 2006 9:52 AM
  Subject: Re: [NSRCA-discussion] Trimming question.


  No, I'm using the MK bellcrank.

  If the problem was only related to the length of the pushrods, then when I re-trim the knife edge performance should return to normal. Thats not the case. The plane pushes to the bottom in the cold and is dead straight on hot days.

  Colin.

  Lance Van Nostrand <patterndude at comcast.net> wrote:
    My guess is you have the deps system.  carbon fiber does not have as much shrinkage as the rest of your plane.
    --Lance
      ----- Original Message ----- 
      From: colin chariandy 
      To: NSRCA Mailing List 
      Sent: Sunday, September 10, 2006 11:09 PM
      Subject: [NSRCA-discussion] Trimming question.


      I noticed recently that I need to add a bit of down trim as the air temperature drops....maybe as much as 4 beebs going from 30+ days to 15C. That upsets the knife edge trim on the aircraft. 

      Is that normal, or do I have something set a bit marginally, like CG or wing incidence?

      Do you guys typically have a "cold weather set-up" ?

      Colin.

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