home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky sci.electronics:22144 sci.energy:6691 rec.autos:31125
- Path: sparky!uunet!spool.mu.edu!olivea!apple!goofy!mumbo.apple.com!michael.apple.com!ems
- From: ems@michael.apple.com (E. Michael Smith)
- Newsgroups: sci.electronics,sci.energy,rec.autos
- Subject: Re: Flywheel batteries as EV power source
- Message-ID: <1992Dec28.205257.18779@michael.apple.com>
- Date: 28 Dec 92 20:52:57 GMT
- References: <78564@ncratl.AtlantaGA.NCR.COM> <1992Dec22.214616.27043@fcom.cc.utah.edu> <1992Dec25.134459.7728@ke4zv.uucp>
- Organization: Circle 'C' Shellfish Ranch, Shores-of-the-Pacific, California
- Lines: 52
-
- In article <1992Dec25.134459.7728@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
- >In article <1992Dec22.214616.27043@fcom.cc.utah.edu> bbarkey@lark.utah.edu (Brian Barkey) writes:
- >> And gasoline isn't explosive?
- >> I may be mistaken but any power source capable of propelling
- >> a ton or more at speeds greater than 50 mph for hundreds of
- >> miles must have a significant amount of energy in it.
- >>
- >> Brian Barkey
- >
- >You don't understand. The gasoline *does* contain the same amount of
- >energy as the flywheel, that's the whole point of the exercise.
-
- Harvesting a minor nit: It is the combined masses of gasoline AND
- oxigen that contain the same energy. The gasoline alone is rather
- lacking in available energy ... (This just makes your point more
- strongly, so you may have been indulging in a bit of understatement...)
-
- >But liquid gasoline can't explode. Only gasoline vapor properly mixed
- >with oxygen, 14:1 air/fuel ratio, can explode. When it's arranged
- >thusly it's called a FAE bomb. When the US dropped one during Desert
- >Storm, British troops radioed their headquarters and reported that
- >the "bloody yanks" were using nukes on the Iraqis.
-
- The research effort that resulted in the FAE bomb was aimed at
- duplicating some of the heat/blast effects of a nuke, but on a
- small scale, so this isn't too surprising (unless you are on the
- recieving end of one !! ;-)
-
- >Now with the flywheel failure, all the energy is released at once.
- >The only difference between a fire and an explosion is the *rate*
- >at which it occurs. This time the timescale is microseconds. You
- >wind up with an explosion that is about equivalent to 200 pounds
- >of dynamite.
-
- This is, IMHO, the most telling example. Energy released equivalent
- to 200 lbs of dynamite on a similar time scale could have a very
- large quantity absorbed in {phase change, chemical bonds breaking, etc.}
- and still have enough left to be disasterous! Heck, take 99% of it
- away and you still have 2 lbs of dynamite. The car is history at
- this point ... (I'd love to see someone postulate what chemical/physical
- processes are going to happen in a flywheel failure that are going
- to be MORE THAN 99% efficient at converting kinetic energy to non-thermal
- forms ...)
-
- --
-
- E. Michael Smith ems@apple.COM
-
- 'Whatever you can do, or dream you can, begin it. Boldness has
- genius, power and magic in it.' - Goethe
-
- I am not responsible nor is anyone else. Everything is disclaimed.
-