REFLECTOR: shimmy

[cgputney at peoplepc.com]

 Ron, the efdyn data shows "no side load"  so arms and gears are out.  It would have to be mounted such that pure torque gets applied to it's shaft.
Gordon
  ----- Original Message ----- 
  From: Velocity 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Friday, February 20, 2009 10:55 AM
  Subject: Re: REFLECTOR: shimmy


  http://www.efdyn.com/pdf/xcrd%20page.pdf

  Would have to run the calculations but this unit I think would fit at the bottom of the gear leg . Fix the rod to the gear leg the body of the unit to the fork.


  Ron
    ----- Original Message ----- 
    From: nmflyer1 at aol.com 
    To: reflector at tvbf.org 
    Sent: Friday, February 20, 2009 9:51 AM
    Subject: Re: REFLECTOR: shimmy


    Looking at the pic that Sid sent, I was wondering if fixed gear Velocities have the same tendancy to shimmy that RGs do? Looking at the RG nosewheel, it looks like a big shopping cart wheel. The fixed gear version looks like it would have more arm once/if it did start a shimmy. It also looks like it would put more load on the back of the bellville washers.  Is one more prone to shimmy than the other? 

    Kurt 


    -----Original Message-----
    From: Sid Knox <sbjknox at earthlink.net>
    To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
    Sent: Fri, 20 Feb 2009 8:41 am
    Subject: Re: REFLECTOR: shimmy


    From: "David Ullman" <ullman at robustdecisions.com> 
     
    > Sid, thanks for the plot showing the two types of friction. The drag 
    > force 
    > shown on the plot is measured where? Is it at the axel, parallel to the 
    > center line or ?? Also how did you get these values? 
    > 
     
    David, the "data" (Drag data_c10 (1).jpg) from my previous message is not 
    "hard data" but simply an aid to allow one to visualize the general trend of 
    the drag (damping) exhibited by the two methods. 
    After seeing the setup with the fish scale, I believe you can appreciate the 
    difficulty trying to pull with some constant rate in an arc while keeping 
    the pull vector orthogonal to the aluminum bar. 
    For each condition, I just pulled and observed the scale and wrote down a 
    value. After several pulls, even tho the data values had a lot of scatter, 
    the trend was apparent and that is what I plotted. 
     
    Sid 
     
    member DNA (National Dyslexia Association ) 

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