For 6S LiPos with approx. 5800mAh Ending number -35 is suitable for newer Skyfox mechanicss (from around 2010, brass inserts with M3.5 internal thread in the main gear) Ending number -30 is suitable for older Skyfox mechanicss and hanging mechanicss (before around 2010, brass inserts with M3 internal thread in the main gear) Please note: Recommended accessories for electric conversion: Ord.No. 41/25 Ord.No. 36/48 Total gear reduction of the Skyfox mechanics with the drive set 3314/6-30 or -35: 1st stage (drive set): 58:33 = 1.76 2nd stage (Ord.No. 36/47:41/25): 40:10 = 4 Total gear reduction 1.76 * 4 = 7.04