REFLECTOR: amount of trim

Lou Stedman stedmanlou at roadrunner.com
Mon Nov 10 11:31:46 CST 2008 

Thanks John

Lou Stedman
Velocity N7044Q
Olean, NY
  ----- Original Message ----- 
  From: John Dibble 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Monday, November 10, 2008 9:42 AM
  Subject: Re: REFLECTOR: amount of trim


  When installed per the factory recommendation, the sparrow exerts a downward force on the elevator, which must be countered by the trim spring.  The faster you fly, the greater the force.  That's why you run out of trim at high speeds (IAS).  When reversed, the sparrow exerts an upward force, working with the trim spring, significantly expanding trim capability. 
  Actually, at the risk of complicating this, I believe the sparrow, in the reversed position provides more than the necessary force to overcome the force of the airstream on the elevator and the trim spring is actually now exerting a downward force on the elevator, but I don't know how to prove that. 
  John 

  Lou Stedman wrote: 

     Thanks John. I always like to have friends drop by but. I am a bit confused, why would I reverse the sparrow? I am not knogleable on that subject. Lou Stedman 
    Velocity N7044Q 
    Olean, NY 
      ----- Original Message -----
      From: John Dibble
      To: Velocity Aircraft Owners and Builders list
      Sent: Monday, November 10, 2008 7:28 AM
      Subject: Re: REFLECTOR: amount of trim
       Lou, 
      I had the same problem as you.  Right now I'm at the new Dundee airport 17NK.  If you're interested I can stop by and you can fly with me and see that reversing the sparrow strainer has no effect on stability. 

      John 

      Lou Stedman wrote: 

        Thanks Gary. Mine is a little different. When I am solo, I don't have enough down trim. I did a new W&B and found out I need thirty pounds of ballast in the nose when solo. That helps a lot with needed down trim but I can't help but think I need some down trim. What model are you flying? Lou Stedman 
        Velocity N7044Q 
        Olean, NY 
          ----- Original Message -----
          From: Gary Stull
          To: Velocity Aircraft Owners and Builders list
          Sent: Sunday, November 09, 2008 10:17 PM
          Subject: Re: REFLECTOR: amount of trim
           I have much more up then down trim. In my case I never need any down trim even flying solo, always some up trim required. 
            ----- Original Message -----
            From: Lou Stedman
            To: Reflector Velocity
            Sent: Friday, November 07, 2008 5:20 PM
            Subject: REFLECTOR: amount of trim
             I have looked through my manual but do not find information on how much up and down trim I am suppose to have. It does say that the elevator should have 24-26 degrees of down and 20 degrees of up. But it does not mention anything about trim. Can someone shed some light on this? I have lots of up trim but almost no down trim. Lou Stedman 
            Velocity N7044Q 
            Olean, NY 


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