Bob he is correct. The problem with any scale besides 1:1 scale is that the air molecules can't be resized. If we could use 1/4 size air the we could mimic the full scale in every way.. but we can't so we have to make up for it in other ways.. usually speed is where we make things up.
Our propellers are not as efficient as the full scale due to their smaller sizes.. so we typically run much faster RPM"s to make up for that. I think the CG can be the same and the incidences can be the same or close.
A P47 weights about 13,500 lbs for take off.. a 1/6 plane would need to weight 2250lbs!.. 1/6 the weight of the full scale. So you see.. things do change on the models.. The larger the models the closer you can get to the full scale in many areas..