The subject of large rotors (forget about fitting into tower sections for a
moment) might be solved if there were a source of worm drive gears. An
electric motor turns around 1750 rpm, so there is a rough ballpark for the
reduction necessary (~2000:1). With a worm drive, there is no need for
braking. However, that is the end of the idea, so far. I have no clue as
to how to obtain such a drive.
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