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- Xref: sparky sci.electronics:22307 sci.energy:6757 rec.autos:31398
- Newsgroups: sci.electronics,sci.energy,rec.autos
- Path: sparky!uunet!gatech!kd4nc!ke4zv!gary
- From: gary@ke4zv.uucp (Gary Coffman)
- Subject: Re: Flywheel batteries as EV power source
- Message-ID: <1993Jan9.183414.19078@ke4zv.uucp>
- Reply-To: gary@ke4zv.UUCP (Gary Coffman)
- Organization: Destructive Testing Systems
- References: <1hnnrdINNnna@gap.caltech.edu> <1992Dec28.220947.19148@michael.apple.com> <drury-070193073338@esrfd.es.dupont.com> <1993Jan8.010401.6096@cis.ohio-state.edu>
- Date: Sat, 9 Jan 1993 18:34:14 GMT
- Lines: 33
-
- In article <1993Jan8.010401.6096@cis.ohio-state.edu> rubin@skiing.cis.ohio-state.edu (Daniel Rubin) writes:
- >
- >I think comparing expanding gases or fluff or whatever in a flywheel and
- >that of gunpowder in a gun barrel is not justified. The gasses released
- >from black powder in a gun barrel act to push an object to "mach 1" or
- >whatever speed was posted earlier in ONE direction. You cannot compare this
- >to gas or whatever explaning in 3-D space. I pile of black powder won't move
- >an object placed on top of it at all or a very small amount, probably 1/100000
- >the acceleration of it in a barrel. That actally turns out to be a great
- >example. In a previous post it was said that 7 grains of black powder can
- >push a bullet to mach 1. That may be true IN A GUN BARREL. Take 1 pound of
- >black powder and place it on the ground and put a bullet on top of the pile.
- >Light the pile and you get a lot of fire and heat and the bullet will most
- >likely not even budge, just get really hot! I wish I could include the
- >amount of hot gasses released from a pound of black powder as compared to
- >7 grains, but I can't and the ratio between 7 grains and 1 pound should
- >describe the situation well enough...
-
- I urge you not to try this experiment at home. Blackpowder is a primary
- explosive rather than a flamable solid. It can explode *unconfined*
- when ignited in amounts of 1 pound or more. That explosion will be more
- intense than that of a similar amount of dynamite, which will also
- explode unconfined. To dispose of blackpowder safely by burning, you
- must spread it thinly along the ground in trains and ignite only one
- end, allowing it to burn *slowly* with the heat rapidly conducted away
- by the large mass of air to which it is exposed.
-
- Gary
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