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what kind of difference in feel would you get from them? Does it help with the "mushy" feeling we get when maneuvering the 109 at low speeds? I understand it helps at low speeds, but is it a pure "ok, I can keep going now" or maybe a "I have much finer control now" type deal?
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Much of what you are asking depends on the specific stability and control of the aircraft in question. I will try to convey the general effect of the slats outside of specific stability and control.
You can definitely feel when the slats deploy. It moves the trim point and the stick pushes back against your hand trying get to that point.
The slats energize the boundary layer. What does that mean? They create turbulent flow over the wing. Turbulent flow is high energy flow and that means it has energy to convert that flow to lift. That is not turbulence as in buffeting. Buffeting is caused by flow reversal which means the boundary layer separates from the wing stalling that portion.
A boundary layer has two types of flow, Laminar and turbulent. Watch a cigarette in an ashtray sometime as it burns. The straight smoke is laminar and where it becomes wavy is turbulent. Laminar is low drag and low energy. Turbulent flow has more energy and more drag. The higher energy means it can meet the lift force required at a lower dynamic pressure.
The effect is best described as the airplane responds like it is flying at a much higher speed. It does not feel mushy or like it is struggling in slow flight. You can maneuver more precisely than you could when the slats were not out. As you get closer to CLmax and the dynamic pressure drops in 1G level flight, that feeling will diminish.
Is that clear or confusing?