REFLECTOR: shimmy

cgputney cgputney at peoplepc.com
Sat Feb 21 07:43:06 CST 2009


Sid, please advise approximate diameter of the piston in your damper, as well as size of hole in piston.
Thanks
Gordon Putney

-----Original Message-----
>From: Sid Knox <sbjknox at earthlink.net>
>Sent: Feb 20, 2009 10:41 AM
>To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>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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