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← ScienceWhich adverse outcome happens when a subsonic aircraft exceeds its critical Mach number during flight?
A)Increased skin friction drag occurs✓
B)Laminar boundary layer is enforced
C)Elevator effectiveness improves markedly
D)Induced drag from wingtip vortices diminishes
💡 Explanation
Exceeding critical Mach number leads to a sharp rise in drag because local supersonic flow causes shock waves, leading to flow separation via adverse pressure gradient effects downstream from the Shock Wave Boundary Layer Interaction. Therefore increased skin, form, and wave drag, rather than benign flow is resultant.
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