ORIGINAL: Matthew007
Well, you know how much power you want, but what you don't know is what to gear it so that when you UP the voltage, the final result, Power (watts), stays the same
This is so wrong. Power=Torque x RPM and P=V x I Up the voltage : more power regardless of gearing. Gearing changes the ratio of torque and rpm, either up/down or down/up respectively.
And no you are wrong, more volts does not automatically mean "more power regardless of gearing." I can up the volts from 7 to 14 volts, and then switch from a 25 pinion to a 12t pinion thereby reducing the load on the motor quite a bit, and so the motor will likely pull less amps and therefore the volts x amp formula would result in not that significant of a power increase, if at all.... see what I mean?