Discussion
A wing with \( 25 \) degrees of sweep is changed to \( 35 \) degrees at the same cruise Mach number of \( 0.80 \). The normal Mach number falls from \( 0.725 \) to
Answer: D
Correct answer: 0.655
Applying the sweep relation at the new angle,
\[ M_n = 0.80 \times \cos 35^\circ = 0.80 \times 0.8192 \approx 0.655 \]Ten more degrees of sweep buys another 0.07 of normal Mach number, which is a useful margin against drag rise. The cost is paid at low speed: more sweep means a lower maximum lift coefficient, a stronger tendency to tip stall, and a longer, heavier structural span for the same aerodynamic span.
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