RPM Spinup Test

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A 350g, single tooth, 90mm diameter disc run off a Turnigy Aerodrive C3530 1700kv brushless motor on a 1.7:1 ratio. Run off a 3S (11.1v) Lipo pack to give a max rpm of 21,000 on the motor and 13,000 on the disc. Tooth speed is 140mph.
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Why single toothed? At that rpm does counter balance not matter?

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