just to clear a couple things up, first, 5700 kV does not mean 5,700,000 volts. kV is the constant rpm per volt rating of the motor. so as it has been mentioned you get 5,700 RPM per 1 volt applied to the motor. second, brushless motors do indeed have turns. some manufacturers identify their motors using turns [novak, lrp, feigao] and some manufactures identify them by their kv ratings [cc, lehner]