Lee, the 46 FX is plenty of power ! Not sure how much better the 50 is ? have not even seen one yet. We are using an APC 12-1/4 x 3-3/4 and it works real well. I tried using all HS225MG mini servos but had the alirons lock up twice ?? Just put in some JR 4131's and it is working fantastic ! I was trying the 225's to save weight, but the rudder 225 also stripped out the only nylon gear in it in flight ( stuck full right rudder and then finally popped back to center) . Still using the 225's on rudder and elevator - they are very quick !! Have FUN !!!!!!!!! Rod & Chris