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Article #15039Re: Flywheel batteries as EV power source
From: Andrew - Palfreyman
Date: Tue, 22 Dec 1992 17:33
Date: Tue, 22 Dec 1992 17:33
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I wrote: >I have a problem with this; if v^2 ~= 1e5 (m/s)^2 and you've pumped in >about 3MJ, the mass must be about 60Kg for a disc shape. Perhaps the speed >is not nearly so high - this is hardly a locomotive weight! >(Hint: use Disc Energy = 0.5m(r*w)^2 and 1hp = 764W). dk: : Nobody said 3MJ. : : 500 HP = 300 KW : : 300 KW * 28800 seconds [all [the 8 hour] night] = 8640 megajoules. Oops! Yup, I dropped a factor of 3600. Make that 1e10 joules. Now the mass should be about 2e5 Kg, or 200 metric tons. Andrew Palfreyman
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Path: arc1-ca.pugleaf.net!sparky!uunet!portal!cup.portal.com!lordSnooty From: lordSnooty@cup.portal.com (Andrew - Palfreyman) Newsgroups: sci.electronics,sci.energy,rec.autos.tech Subject: Re: Flywheel batteries as EV power source Message-ID: <72197@cup.portal.com> Date: Tue, 22 Dec 92 09:33:20 PST Organization: The Portal System (TM) References: <1goebdINNik@gap.caltech.edu> <3204@contex.contex.com> <72055@cup.portal.com> <1992Dec21.215940.13504@kestrel.edu> Lines: 17