Discussion
The most important single parameter governing whether a section stalls gently or abruptly is
Answer: D
Correct answer: The leading edge radius
It is the leading edge radius that decides where separation begins. A generous radius keeps the nose suction peak moderate, so the boundary layer first fails near the trailing edge and separation creeps forward, giving a rounded lift curve and buffet warning. A sharp nose produces a violent peak and separation at the leading edge, and the lift collapses without warning.
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