nanner1 from your comment about the loop and it falling out.. it must be really heavy or theres something way off. i have 4 electrics and i started with electrics/they all have more than enough power to hover and maintain vertical and pull out easily. i havent purchased this plane yet but was thinking about it.. it has around a quarter more wing area than the yak and is only a little heavier.. your plane should float in the air/the 10x4.7 is for the lighter indoor set up/id try and apc 11x4.7 im sure if everything else is rite with plane it has to be the battery weight and the reciever. doing some research here kokam 1500 3cell 11.1v 3.95oz/if your running a 3cell 7.4 that would really explain the proplem e-flite lipo 3 cell 1200 3oz. not a huge difference/but an oz. id give a e-flite rep a call at # i posted earlier/the 450bl would probally pull the plane all over the sky/its for the mini edge and planes in the 20oz. range/youd probally have some problems getting cg rite with it to. also theres two 400 out runners.. the 920kv im running and a 740kv.