Drive set without motor and controller for the electromechanics Ord.No. 1002/80 and 1002/82 with 1880 mm rotor diameter/multi-blade For 10S LiPos with about 5800mAh Total gear ratio of mechanics and drive set: 1st stage (Ord.No. 870/60:128/22): 60:22 = 2.73 2nd stage (Ord.No. 830/90:830/18): 90:18 = 5 Total gear ratio: 2.73 * 5 = 13.65