Trimming Help

[Tony Stillman]

Wayne;

Most of the time, the problem is not too much tension, but the fact that the loop on the adjuster is too small....  It is very important that the spring be able to pivot slightly.  If the loop is too tall, the HD springs tend to twist the adjuster just slightly....  If it is not corrected, the repetitive motion will eventually cause the adjuster to fail.


Tony Stillman
Radio South
3702 N. Pace Blvd.
Pensacola, FL 32505
1-800-962-7802
www.radiosouthrc.com
  ----- Original Message ----- 
  From: Wayne Galligan 
  To: discussion at nsrca.org 
  Sent: Wednesday, April 07, 2004 3:28 PM
  Subject: Re: Trimming Help


  Larry,

  I will have to second the thingy on the stiffer springs.  I too was guilty of erroneous stick movement during rolls and other areas.  Stiff springs helped as I was often guilty of un noticed elevator stick move while rolling. 
   I did have an experience here last month where the pin stop on my aileron gimble broke from too stiff of spring tension.  Kinda had me worried a little while during a roll the thing kept rolling till I noticed there was NO tension on my left aileron stick.

  Wayne G.

    ----- Original Message ----- 
    From: Larry N Lisa 
    To: discussion at nsrca.org 
    Sent: Wednesday, April 07, 2004 2:18 PM
    Subject: Re: Trimming Help


    I'm a newbie also and won't advise on what to do about trimming for this problem. But my experience with trimming issues was fairly humbling.

    After struggling for many weeks with suggestions about trimming on my plane, I did finally go to a contest and asked a seasoned pilot to check it out. After putting it through a few masters maneuvers that looked impressive to me, he landed and said it just needed a couple of clicks on the aileron.

    After a full season in Sportsman, I look back and reflected that most of the problems were not trimming of the plane. I was coupling control inputs every-time I moved a stick. Looked like I was having trimming problems, and it was repeatable. I could actually screw it up the same way every time.

    I focused on stick movement at every contest and replaced the factory springs with some stiffer springs from one of the Chicago folks, Bobby Satalino. Jim Hubbard did the surgery replacing the springs after the contest and I have been flying much better since.

    Every contest I went to had great folks very willing to help out. Allot of advise on flying maneuvers that allowed me to see improvements at each contest I entered.

    My only recommendation is to follow the advise of others in this thread and get a seasoned pilot to help out.

    Good Luck...

    Larry Diamond
    NSRCA 3083
    AMA 5024


      ----- Original Message ----- 
      From: Bob Pastorello 
      To: discussion at nsrca.org 
      Sent: Tuesday, March 30, 2004 7:57 PM
      Subject: Re: Trimming Help


      Courtesy of Buddy, I've placed (with his permission) his summary of the "trimming" issues.  Probably many of you share my view that his summary was one of the most on-target, concise statements I've read about trimming in a VERY long time, if ever!!!  Posted here for your reference:
      http://www.rcaerobats.net/trim_chart.htm

      Thanks, Buddy!

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


        ----- Original Message ----- 
        From: BUDDYonRC at aol.com 
        To: discussion at nsrca.org 
        Sent: Tuesday, March 30, 2004 1:08 PM
        Subject: Re: Trimming Help


        Paul
        I am no aerodynamics expert, but I have learned some basic's over the years that work for me.
        1. The wing must have a positive angle of attack to create lift.
        2. the stabilizer and elevators steer the pitch attitude of the airplane resulting in more or less lift.
        3. Balance can change the angle of attack which will change the pitch attitude.
        4. Aileron's up or down will change the pitch attitude .
        5. Up or down thrust will change the pitch attitude.
        Therefore:
        A. Increasing the positive wing incidence will cause the airplane to climb, which will require down trim to achieve level flight.
        B. Likewise adding tail weight will cause the airplane to climb and require down trim to achieve level flight.
        C. Added weight does not alter the vertical down line BUT elevator trim added to maintain level flight because of the added weight will effect the down line. Tail weight will require down trim which will steer the airplane more to the belly in a down line, and added nose weight will require up trim which will steer the airplane to the canopy.
        D. In the vertical up line elevator trim and the engine thrust line will effect the vertical and/or yaw direction   
        All of the above will effect the knife edge flight of the model.
        Combinations of adjustments to any or all of the above trim items done at the same time will leave you confused and frustrated.
        Most models will require some mixing to achieve near perfect lines in all flight attitudes in order to minimize / eliminate control inputs by the pilot to maintain a perfect course.
        I have yet to see the perfect airplane should such an animal exist, but I keep looking and building since I truly believe that nothing is impossible.
        When trimming an airplane make a written log of every change no matter how small so you don't have to start over when changes are not correct.
        Buddy 
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