After flying this for a dozen or so times the conclusion is that it is a great sport plane but not really good enough for f3a as the coupling is too much. Rolls are not very axial and the plane is very heavy. In fact with the recommended cells I could get about 12 mins safe with a 13 X 6.5e prop. I feel more and more certain it shuold read 3300 or 3700mAH cells at the most. Any other people found that the 4250mAH are over the top. (No pun intended)? It certainly contributes to a nose heavy ship.