Ripmax Quantum II 25 Speed Brushless MotorThis is a higher RPM, Speed version of the Quantum II 25 motor for high power speed flight. It is ideally suited to the Ripmax Easy Street II with either 3S or 4S Li Po batteries. Due to the higher current this motor requires, it needs a 60A ESC rather than the 40A ESC used on the standard version. On 3S it works well wirth a 10" x 7" E APC propeller but if you want more performance we suggest a 9"x 7. 5" E APC propeller on 4S for some extra punch!