REFLECTOR: shimmy

[Velocity]

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 ) 

_______________________________________________
To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html




------------------------------------------------------------------------------
  Access 350+ FREE radio stations anytime from anywhere on the web. Get the Radio Toolbar! 


------------------------------------------------------------------------------


  _______________________________________________
  To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

  Visit the gallery!  www.tvbf.org/gallery
  user:pw = tvbf:jamaicangoose
  Check new archives: www.tvbf.org/pipermail
  Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tvbf.org/mailman/private/reflector/attachments/20090220/d620e685/attachment.htm