On Tue, 8 Jan 2008 21:12:47 -0600, Steve Thompson wrote:
>
>>(please read the article) at
http://searchdatacenter.techtarget.com/originalContent/0,289142,sid80_gci1288892,00.html?track=NL-455&ad=619599&asrc=EM_NLN_2844322&uid=6570353
>I don't think the person that wrote that article was really up to speed on
>how this works.
>
>That was about 1964. Given the changes in technology in the past 40+ years,
>I would imagine that a flywheel spun up to 54,000 RPM (as the secondary ... )
>
I'm skeptical about that. A back-of-the-envelope calculation says it's
pulling a few hundred thousand gravities at the periphery (proportional
to radius; make a reasonable assumption). And a rotor disrupts at a
peripheral velocity roughly the speed of sound (not coincidence; both
are some small coefficient times SQRT( elasticity / density ).
Misplaced decimal point? Of course, at 900 Hz, you save a lot on
power supply capacitors.
-- gil
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