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- From: jgd@dixie.com (John De Armond)
- Subject: Re: Flywheel batteries as EV power source
- Message-ID: <l3gr8ma@dixie.com>
- Date: Wed, 23 Dec 92 04:39:53 GMT
- Organization: Dixie Communications Public Access. The Mouth of the South.
- References: <1992Dec16.192456.6261@news.cs.brandeis.edu> <1992Dec16.232521.14672@mtu.edu>,<71918@cup.portal.com> <1h2udfINNfm0@gap.caltech.edu>
- Lines: 31
-
- carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:
-
- >Sorry, but you apparently missed a post early in this thread where the
- >designers of one of these flywheels were quoted as saying that in a
- >catastrophic failure, the flywheel WOULD disintegrate. They described the
- >flywheel after disintegration as "fluff." This bit of disingenuousness was
- >apparently meant to make the flywheel seem safe. After all, "fluff" couldn't
- >possibly be dangerous, could it?
-
-
- yup. I have a little demo of the power of "fluff" I occasionally do
- when I have visitors in the lab. I take a .308 NATO brass, load
- it almost to the bottleneck with 2400 powder (a fast pistol powder) and
- plug the top of the case with a wad of ordinary kitchen paper towel.
- I load the whole assembly in my silhouette pistol and fire it
- at a piece of 1" plywood from a distance of about 3 inches. The bit
- of paper towel "fluff", exiting the barrel at a velocity of about 4000 feet
- per second, easily penetrates the inch of wood. When fired at a distance of
- over about a foot, the air drag (not to mention that it is spinning at about
- 240,000 RPM from the rifling twist) has so disintegrated the "fluff" that it
- does not even imprint the wood. In the context of this flywheel discussion,
- of course, the "fluff" would travel in a vacuum until it hit something and
- so would NOT be disrupted.
-
- John
- --
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