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There are two additional variables in the shimmy equation that I haven't seen
anyone mention yet. The first is the preload applied to the nose wheel bearings.
 I don't have access to my manuals at the moment, but the nose wheel is not
supposed to rotate more than x revolutions when spun by hand.  Also, the amount
of shimmy damping provided by the oleo strut varies from one to the next.  I had
the opportunity to check the rotational resistance of the strut on the factory
360 a while back.  It was substantially lighter (about 50%) than mine.  It must
be a specific combination of all the factors mentioned that initiates a shimmy.
I hope we can find that combination.

Chris Zavatson
N91CZ
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