It's really not a big deal. Just get a 10x6, it will still fly like a trainer. The only differance will be when you want to take the baffle out of the muffler and try loops and inverted and things that take a bit of power, when you open up the throttle the plane will scoot a bit better. You won't be doing pylon racing or be able to have unlimited verticle pulling out of a hover, no matter what prop you use. Then you just go get a 4* or a good second plane, and maybe move the Nt .46 to it..? - Joe