CTE

[Keith Black]

I can't speak to trim change on pull-pull, however yesterday after a night of 35 deg. weather I went flying and when I turned the plane on my rudder began osculating. I also experienced this at the Hot Springs contest on a chilly morning. Luckily at Hot Springs Dave Cotton suggested I tighten my pull-pull cables and the osculation went away and I was able to fly (thanks Dave). Yesterday morning I also tightened the cables and the problem disappeared.

Since it happened again yesterday with temperatures colder than Hot Springs I believe it is due to the fuse shrinking while sitting in my garage in the colder temperatures. 

Therefore, even if the *trim* doesn't change for pull-pull, your cable tension will change which could cause differences or possible problems.

Keith Black

----- Original Message ----- 
  From: Bob Pastorello 
  To: discussion at nsrca.org 
  Sent: Tuesday, November 25, 2003 5:05 AM
  Subject: Re: CTE


  There's a thread going now on RCU about this very topic.  My .02 based on esperience....wooden fuses stretch and contract, just like those privacy fences aroun the deck!!  Since CF (or gigerglas) pushrods with steel ends DO NOT change 1/10th as much, I concluded - for me - that going pull-pull was the answer.
      It has been so far (about 8 airplanes since I've had a pushrod).

  Bob Pastorello, Oklahoma
  NSRCA 199, AMA 46373
  rcaerobob at cox.net
  www.rcaerobats.net


    ----- Original Message ----- 
    From: Amir Neshati 
    To: discussion at nsrca.org 
    Sent: Tuesday, November 25, 2003 1:42 AM
    Subject: Re: CTE


    Pull-pull will eliminate the trim change...

    Amir
      ----- Original Message ----- 
      From: Nat Penton 
      To: discussion at nsrca.org 
      Sent: Monday, November 24, 2003 7:24 PM
      Subject: CTE


      Gray what is the CTI for balsa ? I have carbon push rods / balsa fuse and my elev trim moves around considerably. I suppose it is because of humidity variation between the shop and outdoors ?? The pushrods are 50" long.      NatPenton


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