🚀 go-pugleaf

>A major disadvantage that I see with the flywheel scheme is the amount
>of time it would take to "charge" it up from zero energy.  If the
>flyweel can provide a large amount of output power for a long time,
>then it should take at least the same time to charge it back.  A
>scheme where flywheel systems are interchanged at "fuel" stops could
>alleviate this issue.

I would think that a flywheel could be charged a *lot* faster
than a battery.  The major limit would be the power source and
path into the flywheel -- not the wheel itself.

I once heard a large motor-generator started with a broken    .
starter -- no slow start.  In the few seconds (10?) it was
powered on it went from just turning over to what sounded like
full speed.  It sounded like a jet engine being wound up in the
building!  (This was without any load on the MG).

This ran on 3 phase 480 VAC power and I'd guess it was at least
50 KVA.  It output 400 hz power and could put out enough power to
run both an IBM 360/91 CPU and a 3033 CPU at the same time.