Greetings,

    I'm back on the list, I don't remember when I went off the list, but
it had been such a difficult year for workload that I hadn't though
about missing mail.

    Hopefully, I'll find a little more time to experiment this year.  My
current project is based on the Shackleford-Gundersen design, and I have
a few questions about the design.

     I'd like some help with the following questions:
- what is a practical pendulum length
- what way would the mass of the pendulum affect performance.
I'm assuming that there is some relationship between the pendulum mass
and
the amount of force feedback, is there a rule of thumb?  (I'm not found
of
doing the math).  Hopefully, the feedback loop gain adjustment is simply

a matter of setting the gain just to the point that oscillation is
induced, and then backing it off, will that work?

        Thanks,

            Ron T.

--
R & L Thompson,
Gander, Newfoundland, Canada,
rlthompson@................. , http://home.thezone.net/~rlthomps/
"Who are these that fly as a cloud, and as the doves to their window?"
Is 60:8


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