Discussion
What is the effect of increasing control run friction?
Answer: D
Friction adds a force that must be overcome before anything moves and that does not vary with deflection, so it raises the breakout force and masks the genuine gradient around neutral, leaving the pilot unable to feel small displacements and inclined to over-control. It is why friction limits appear in maintenance manuals alongside free-play limits. It has no effect on the aerodynamic moment at the surface. It tends to reduce rather than raise the flutter speed, by admitting free play as components wear. And it degrades rather than improves the speed gradient, since a constant force term carries no speed information at all.
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