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- Xref: sparky sci.electronics:21478 sci.energy:6413 rec.autos:30410
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!seismo!skadi!stead
- From: stead@skadi.CSS.GOV (Richard Stead)
- Newsgroups: sci.electronics,sci.energy,rec.autos
- Subject: Re: Flywheel batteries as EV power source
- Message-ID: <51705@seismo.CSS.GOV>
- Date: 23 Dec 92 18:11:39 GMT
- References: <78564@ncratl.AtlantaGA.NCR.COM> <1992Dec23.154010.13703@fcom.cc.utah.edu>
- Sender: usenet@seismo.CSS.GOV
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-
- In article <1992Dec23.154010.13703@fcom.cc.utah.edu>, bbarkey@lark.utah.edu (Brian Barkey) writes:
- > I guess I missed the part about dissipating energy over ms. What's the
- > basis for this?
-
- This has all been hashed out a couple of times, but I'll summarize.
- The energy dissipates over microseconds to milliseconds because of how
- fast the material fails, and how fast it will fully interact with the
- container. These follow from the stress on the material and the velocity
- at which it moves.
-
- > Also, sometimes in accidents the gasoline does mix sufficently well
- > with the air to be a hazard (remember the Pinto?) I'm certain that
-
- The Pinto as well has been mentioned - Pintos did not explode except in
- movies, but they did burn rather spectacularly. It takes time to create
- a cloud of mist or vaporized gas at the proper ratio of gas to air. It
- has to stay in place (no wind) and then be ignited by something. This
- is why burning gas is nowhere near as dangerous as a fuel-air bomb,
- even though there is usually less gas in the bomb than in a gas tank.
-
- > in a flywheel powered car there wil be accidents that will be explosive
- > and many that are not. Isn't this a factor of the design? If the
-
- Yes, it is a factor of design and basics physics. Fundementally, any
- large amount of energy stored mechanically in a small volume is subject
- to explosion. The reason is that failure of the mechanical storage
- releases all the energy at once. With gasoline, you need to vaporize the
- stuff and then mix it with air. This takes time and is hard to do
- completely with a large amount of gasoline (and even when you do, the
- volume of air is so large that the explosion takes place in a big volume
- dissipating energy and force). The mechanical failure occurs far more
- quickly, and all the energy is released when it does.
-
- > flywheel power source is a viable and marketable option I'm certain
- > that manufacturers in lawsuit happy countries like this would
- > make a couple of prototypes and run 'em into walls to see what happens.
-
- The question really is - Are these "manufacturers" for real, or just
- cheap hucksters out to con "investors" and naive government officials
- out of money. Think about the free-energy con men.
-
-
- --
- Richard Stead
- Center for Seismic Studies
- Arlington, VA
- stead@seismo.css.gov
-