Wouldn't it depend on your source of input? if you have for example a limited rpm range and low torque, by increasing the size of the flywheel you are storing more energy per rev, and when it's small you can get it up to speed, which in this case may be needed as i think it wouldn't have the torque to get a large flywheel started... kind of like having a gear box built into the flywheel.
but we don't have any movement yet so it'll be "a nice problem to have" :-)
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