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For sure you have to interchange pulley-diameters, just to get the correct ratio.
A safe thing, to be warned, that the diameter is too small is, if the generator light comes on! LOL
5 blades for president! 12 blades are good, but...! 11 blades provide best airflow, besides it's less noisy than the 5 blades! Problematic is, that you can't get the 11 blades new.
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