Unfortuantly fly-wheels do not make for great batteries for majority of applications.
Best for cases where you want both high power and fast discharge.
That was a perfect example of the advanatages of a flywheel as a battery - used for the 4km gaps between plylons.
But not suitable for the whole journey.
They also highlighted some of the disadvantages - gyroscopic effect, and requirment of higher speeds (that will need a vacumn).
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