[ExI] The L5 Society ( was: EP and Peak oil.)
hkhenson at rogers.com
Thu Apr 10 19:18:29 UTC 2008
At 09:07 AM 4/10/2008, you wrote:
> >>Fused Quartz, it can do 5 x 10^7 volts/mil.
>"Keith Henson" <hkeithhenson at gmail.com>
> > Can you cite the source for this remarkable number?
>I too thought the number was remarkable, it was larger than even I thought
>it would be so I decided I wouldn't use it unless I could find 3 independent
>references to it, I could. See:
All three of these sites also express the breakdown strength as 5 x
10 exp 7/meter in the next column. Since there are about 40,000
mills in a meter, the correct number is about 1250 volts/mil, which
is more believable. It's better than rubber but not that much. The
sites all seem to have the same error. Point this out to the web
masters if you want to do a good deed.
>By the way, I found one reference that said Muscovite Mica could do even
>better but I couldn't find any conformation so I can't swear to it.
> >> I don't know how much a power satellite would weigh
> >Easy to look up. I am using 2kg/kW which works out to 10,000
> >metric tons for 5 GW.
>That figure is indeed very easy to look up but it is much less easy to have
>any confidence in it. Even with mundane things like civilian airliners the
>early design estimates of the weight of the finished product usually proves
>to be far too optimistic,
Do you have a cite for this statement?
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