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- Path: sparky!uunet!spool.mu.edu!agate!dog.ee.lbl.gov!news!nosc!crash!cmkrnl!jeh
- From: jeh@cmkrnl.com
- Newsgroups: sci.electronics
- Subject: Re: Flywheel batteries as EV power source
- Message-ID: <1992Dec16.112657.975@cmkrnl.com>
- Date: 16 Dec 92 11:26:57 PST
- References: <1992Dec13.114534.961@cmkrnl.com> <1992Dec15.004956.465@mtu.edu> <15DEC199213355410@rover.uchicago.edu>
- Organization: Kernel Mode Consulting, San Diego, CA
- Lines: 34
-
- In article <15DEC199213355410@rover.uchicago.edu>, frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger) writes:
- > In article <1992Dec15.004956.465@mtu.edu>, cmwolf@mtu.edu (christopher m. wolf) writes...
- >>jeh@cmkrnl.com writes:
- >>The same flywheels are referenced in the last IEEE. They are low mass, very
- >>high speed devices. The low mass does not obstruct cornering, while the
- >>high speed and low diameter helps them to store more power. They supposedly
- >>should take about 10 minutes to fully "charge", given a large enough (not
- >>impossible) power source, although usually not available in the normal home.
- >>They should be made of a composite fiber material, so if they should break
- >>apart, they will basically turn into something resembling cotton, instead of
- >>destroying everything around it. Several of these would be needed. The
- >>magnetic bearings would supposedly allow them to spin for months if not
- >>being used.
- >>
- > What do they do about precession? I remember that being a problem, and
- > precession effects would still be proportional to the amount of energy
- > stored. (Love a car that works great in Kansas but goes bananas in San
- > Francisco.)
-
- I didn't write the part that you quoted and attributed to me, so I'm the
- wrong person to ask.
-
- As someone else has mentioned in this thread, if you put the axis of rotation
- vertical, you have no problems making flat turns, but you will have problems
- on banked curves or (as you mention) in hilly places like SFO where the
- pitch of the vehicle can change rapidly.
-
- I also would expect that you'd need an even number of flywheels, in CCW/CW
- rotation pairs, or the vehicle would have a pronounced tendency to yaw in the
- direction opposite to the flywheel's spin!
-
- --- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
- Internet: jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
- Uucp: ...{crash,eisner,uunet}!cmkrnl!jeh
-