I suspect you're correct as far as the placement is concerned though there may be more sophisticated methods for designing these in larger A/C. As I recall, the Cessna's 'flap' was more inboard. I had some hours in a Piper Cherokee but recall nothing as to how it worked. Can you explain the inertia aspect, and how that translates to models. With my limited flying experience in the above planes, you 'feel' the stall coming on. Trying to compare the relationship of the speed curve between, e.g., 'slow' flying and a stall. I recall years ago flying an old Schweitzer sailplane wherein the the difference between speed at level flight and stall was maybe 2or 3 knots.