It will fly just fine with the FXi on it. I have one with a .46fx and it can be fast if you want it to be. I am running a Zinger 12x5 prop just to slow it down a bit. I tried the APC 12x4 and the plane is MUCH faster with this combo but you have to fly it fast. The 5 pitch prop moves a bit more air at low throttle and is much more manageable to fly slow when you want it to.