......1234, I also intended to chime in on the .40 LA in this plane. Yes, it will fly it just fine once it's in the air. Pulling it thru grass to get enough air speed for takeoff is where the .46 LA is better. If you fly off a paved runway is doesn't matter. The outside physical dimensions of the .40LA and .46LA are identical so if you want to upgrade later it is a direct bolt in swap including the pitts muffler and the mounting bolt pattern. Do you fly off grass? Short grass maybe??