New rotors, using minimoto brake discs 120mm dia, 2mm thick - neater than the original rotors and run truer allowing a smaller air gap. Magnets from old Fujitsu hard drives (8 magnets per rotor, 2 pairs of poles per magnet so still 8 cycles per revolution). Makes enough to run the beacon *and* a small light bulb at 240rpm, even though the 12V regulator drops out a bit.
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