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- Xref: sparky sci.electronics:21196 sci.energy:6279 rec.autos.tech:16943
- Path: 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: <72055@cup.portal.com>
- Date: Sat, 19 Dec 92 13:44:22 PST
- Organization: The Portal System (TM)
- References: <1992Dec15.194558.2556@adobe.com>
- <1992Dec16.192456.6261@news.cs.brandeis.edu>
- <1goebdINNik@gap.caltech.edu> <3204@contex.contex.com>
- Lines: 20
-
- Frank E Perdicaro writes:
- : As an interesting side light, the largest forging ever made is
- : the largest flywheel ever that stores energy at MIT for the
- : ALCATORC-MOD fusion reactor. It takes like 500 hp all night to spin it up,
- : and 3 seconds to stop when the switch is flipped.
- :
- : Yeah, megajoules, many of them. If there was a quake when the thing
- : was spinning, it would remove a large section of Cambridge.
- :
- : Its surface speed is just below the speed of sound, and it weighs like
- : a very large steam locomotive ; and its right next to the FISSION
- : reactor..... they know there is no way to stop it if there is a quake,
- : so its just in a simple flimsy building.
-
- 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).
-
- Andrew Palfreyman
-