i had one of these and in my opinion the 52 4 stroke wont be enough. mine came ot a little over 7.5 pounds with an os 46 two stroke. and needed to be flown at 3/4 throttle minimum. 70 four stroke or 55ax 2stroke would be my recomendation. also go more towards front of cg range as mine was a little tail hevy. hope this helps. Andrew Wisc.