Great plane, flies great "Stock". I would mount the tank outside the wing for conveinence but thats the only mod I would do. I have an os 46 fx and have plenty of motor left for pull out of hovers! A ys 63 will fly these nice too, as thats what I have on my su-do-khoi! Great Plane you'll love it! Probably the best hovering 40 size plane I have flown, and I have flown many! Happy flying