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Which risk increases when a subsonic aircraft wing's boundary layer transitions to turbulence?

A)Decreased stall angle of attack
B)Increased induced drag coefficient
C)Premature flutter instability onset
D)Elevated structural resonant frequency

💡 Explanation

A turbulent boundary layer energizes the flow near the surface, increasing the momentum near the trailing edge and thus causing separation. This leads to the *boundary layer separation*, because the flow can no longer adhere to the top wing; therefore the stall angle decreases, rather than drag increases under normal flight.

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