Drive set without motor and controller for the electromechanics Ord.No. 1002/80 and 1002/82 with 1600 mm rotor diameter/multi-blade and 1800 mm rotor diameter/2-blade For 12S LiPos around 5800mAh Total gear ratio for mechanics and drive set: 1st stage (Ord.No. 870/84:128/26): 84:26 = 3.23 2nd stage (Ord.No. 830/90:830/18): 90:18 = 5 Total ratio: 3.23 * 5 = 16.15