Im not sure when it comes to all the thrust calculations, but a 46AX will definitely be good enough to pull this plane around. With the 55AX on the OMP Edge 540 Im getting about 11750 RPMs with the Xoar 13x4 but this engine hasnt been fully broken in, Ive got less than half a gallon through it. And if I remember right my 46AX wasnt fully broken in until at least two gallons were through it. With a APC 12.25x3.75 on the 46 AX I was getting around 12000 RPM's. A good 3D foamy is another good inexpensive alternative to learn 3D, but only downfall its harder to practice hovering or any 3D if the wind is more than 5 mph since they are soo light. And the micro servos just dont seem to perform as good, could just be the cheap ones I bought. I also forgot to mention, after thinking about it I remembered I have that aileron servo out of my pro yak, so its actually 4.5 lbs plus the weight of a standard hitec servo(1.5 oz).