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Flywheel statistic confusion

  1. Sep 19, 2011 #1
    In my exploration of energy storage options i came across a statistic several times that given a vacuum and magnetic bearings, a flywheel can achieve 97% storage efficiency.

    Whether its true or not, what does 97% represent? Does it imply that the energy will hold regardless of time and its a one time transfer loss or do you lose 3% per period of time.

    If i find the source ill post the link.
  2. jcsd
  3. Sep 19, 2011 #2


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    Staff: Mentor

    It must assume a certain time period -- or perhaps that's over 0 time.
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