You may want to look at PTO drive generators for you power head. These unit are typically drive by a tractor PTO. They range in wattage from 4kw to 200kw, at 1000 to 540 RPM. Google "PTO generator". If you had a 60 rpm wheel you would only need a 9:1 induction to achieve 540 rpm. This would be more practical than trying to step up to 3600 RPM. IMO. Good luck.
