Discussion
Which flight condition typically produces the largest hinge moment on an elevator?
Answer: D
The moment is the product of a coefficient that grows with deflection and a dynamic pressure that grows with the square of speed, so the worst case is a large deflection at high speed - typically a recovery from an upset or a high-speed pull-up, and the case that sizes the actuator. Low speed at neutral is close to the minimum. The stall is at low dynamic pressure. And trimmed cruise has the surface near its zero-force position by definition. A design review checks each of these separately, since a fix for one can quietly worsen another.
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