For 2x6S or 12S LiPo with approx. 10,000mAh Suitable for the Vario mechanics 1002/76, 1002/77, and 1002/78 Please choose which motor pinion you need: Ord.No. 500/13 for rotor speed 850 Ord.No. 500/18 for rotor speed 875 Ord.No. 500/19 for rotor speed 960 Total reduction of the above mechanics depending on the motor pinion used: 1st stage: (Ord.No. 722/77:500/13) 77:17 = 4.53 (Ord.No. 722/77:500/18) 77:18 = 4.28 (Ord.No. 722/77:500/19) 77:20 = 3.85 2nd stage (Ord.No. 500/70): 63:14 = 4.5 Total gearing using Ord.No. 500/19 as an example: 77:20 * 4.5 = 17.325