Speed (q) determines the absolute forces, but not the direction. That's the aoa, Cl and thus the wing loading.Flew some aricrafts with negative positions. How did you find that effect changes in terms of speed? I always thought and found that at HIGHER speeds they require MORE force to pull them into neutral positive, while -7, -5 degrees (up) goes a EASIER, not vice versa, that was my point.
Indeed, we both noticed that flaps that can move freely move up. That's why flaps that can't (on most aircraft) won't flutter, because flutter requires freedom to move both ways.
It's the spar/wing. Lowering the flaps lowers stall speed. That also lowers the speed at which you can pull 3.8, or 4.2 G, plus it increases the magnitude of gusts. They also add a lot of torsion in the wing, which - especially at high speeds - is very unwelcome.Also, why is there a Vfe speed? Why you are more likely to break them at higher speeds?