Stored energy grows with the square of speed, so a lighter rotor spun very fast beats a heavy, slow one.
Loïc Bastard, CTO and Hugh McDermott, CCO · Investor webinar, 13 May
The full answer
Stored energy grows with the square of speed, so doubling the speed stores four times the energy. That is why Qnetic uses a lighter carbon-fiber rotor spun very fast, rather than a heavy steel wheel spun slowly. The full-size rotor is still large, but speed does most of the work.
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