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← ScienceWhich aerodynamic effect increases when helicopter rotor tips approach transonic speeds?
A)Compressibility drag dramatically increases✓
B)Total lift production stabilizes
C)Blade stall consistently decreases
D)Effective induced drag dramatically decreases
💡 Explanation
Compressibility drag increases rapidly because the presence of shock waves enhances pressure drag; therefore, drag rises sharply, rather than lift remaining stable or stall decreasing, as viscous effects from turbulence dominate.
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