hi i have a pm motor of 410v dc and 490wats i dont have rpm specs but right now i am using 24 in" high rpm blade set in 24 volt configuration and works very well. ok this motor have a long shaft that i can hook 2 or 3 motors in line and use as a 1 big motor connecting the outputs of the motors in series to step down the rpm cut voltage (lower the rpm to get to the 24 charge volts) the question is i use 2 or 3 of these motors in line what type of blades sets i will use ? i live in Puerto Rico in a mountain about 450ft above the sea level the normal wind speed is about 5 to 15 mph with gust of 23+ mph in the afternoon .