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- Xref: sparky sci.energy:6325 sci.electronics:21310
- Path: sparky!uunet!seismo!skadi!stead
- From: stead@skadi.CSS.GOV (Richard Stead)
- Newsgroups: sci.energy,sci.electronics
- Subject: Re: Flywheel batteries as EV power source
- Message-ID: <51682@seismo.CSS.GOV>
- Date: 21 Dec 92 21:28:17 GMT
- References: <BzJHE7.B8@xrtll.uucp>> <gfBCW0a00YUn84A25_@andrew.cmu.edu> <1h4qbkINNnbi@rave.larc.nasa.gov>
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-
- In article <1h4qbkINNnbi@rave.larc.nasa.gov>, kludge@grissom.larc.nasa.gov (Scott Dorsey) writes:
- > In article <78150@ncratl.AtlantaGA.NCR.COM> mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson) writes:
- > >Sounds like an interesting idea to me. Make one end of the flywheel a motor
- > >driven by line current. Make the other end a generator that powers your
- >
- > This used to be fairly common in big mainframe installations. I worked at
- > a Cyber site that had a flywheel about ten feet in diameter attached to
- > the main motor-generator set. When the power went out, we had about twenty
- > seconds of operation to save registers and copy all jobs out to disk.
-
- Aaaahhhh.
-
- Real world flywheels, now this is more like it. Here, we got a 10 foot
- stationary flywheel that can power a computer for 20 seconds. Probably
- very safe, and possibly lower maintainance than the lead-acid batteries
- currently in use for uninterruptibles.
-
- Given the design of that, how can these other people talk about little,
- portable flywheels capable of powering a car 600 miles (10 hours!).
- The car probably pulls at least as much juice, and they want to power it
- 1800 times as long with flywheels at least 10 times smaller (which means
- at least 10,000 times the revolutions per second) than the practical, real
- world flywheel described above. And I've heard about those 10 foot flywheels,
- they're pretty safe, but every once in awhile one would fail, and they did
- so quite spectacularly.
-
-
- --
- Richard Stead
- Center for Seismic Studies
- Arlington, VA
- stead@seismo.css.gov
-