Drive set without motor and controller for electromechanics Ord.No. 1002/80 and 1002/82 with 1880 mm rotor diameter/multi-blade For 10S LiPos with approx. 5800mAh Total gear ratio mechanics and drive set: 1st stage (Ord.No. 870/84:128/28): 84:28 = 3 2nd stage (Ord.No. 830/90:830/18): 90:18 = 5 Total gear ratio: 3*5 = 15