For 6S LiPos with approx. 5800mAhEnding 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. 41/25Ord.No. 36/48Total gear reduction of the Skyfox mechanics with the drive set 3314/6-30 or -35:1st stage (drive set): 58:33 = 1.762nd stage (Ord.No. 36/47 : 41/25): 40:10 = 4Total reduction 1.76 * 4 = 7.04