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On 2017/Sep/21, at 09:45, David Bowman <David_Bowman@georgetowncollege.edu> wrote:
Both of these hypotheses are testable. BC's photos show he has both an axially symmetric and a lobed spinner whose spin-down data can be contrasted. Also, if a spinner shows a constant drag force term perhaps a tiny drop of very light lubricating oil on the bearings may make that contribution greatly reduced, if it is indeed caused by a dry kinetic friction mechanism.
David Bowman
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