I read somewhere on here that the record holder for an electric boat had the motor spinning 48,000rpm. Is it that higher prop speed with smaller props makes more boat speed or is it just that electric motors make power at that rpm? I used to race electric cars years ago and the motors in general depending on how much money you spent made more power with the engines that could spin more revs. But you had to gear them so they could spin fast. If you geared a modified class motor like a stock motor it wouldn't run well and would eventually overheat. :blink: