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We had "no break" configurations which were 2-4 ton flywheels and just
meant to sustain till the diesels kicked in. Quite sure they were all gone
years ago around here. IIRC these turned pretty slow. Sounds like someone
"reinvented the wheel" ;)

At 09:05 PM 5/20/04 -0500, you wrote:

>AT&T has standards developed for flywheel backup power but I have never ran
>across one in any of the AT&T sites. I only see big strings of large aH cells.
>
>David Bearrow
>
>At 03:59 PM 5/20/04, you wrote:
>>I think these things are available for Telecom power storage (instead of
>>lead acid batteries). They tend to be buried underground in a very strong
>>containment structure in case of bearing failure and to protect against
>>sudden movement etc. Haven't caught on real well yet although this may be
>>more a reluctance of the Telcos to depart from well tested methods. There
>>are ongoing running costs - the flywheels have to run in a vacumn which has
>>to be maintained - pumps etc  required.
>>There are certain difficulties regarding their use in vehicles - think
>>gyroscope!
>>
>>Richard P

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