Discussion
The principal aerodynamic benefit of sweeping a wing on a high-subsonic transport is that it
Answer: A
Sweep reduces the velocity component the section actually responds to, so local supersonic flow and the shock that closes it are delayed to a higher free-stream Mach number. That postponement of drag rise is what makes cruise near Mach 0.85 practical, and it is why every jet transport has a swept wing.
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