Discussion
An aircraft flies at \( M = 3 \). For its leading edge to remain subsonic, the sweep must exceed
Answer: A
The Mach angle is \( \arcsin(1/3) = 19.47 \) degrees, so the sweep must exceed \( 90 - 19.47 = 70.5 \) degrees. The requirement tightens rapidly with speed, and beyond about Mach 3 keeping a subsonic edge demands so much sweep that designers usually accept a sharp supersonic edge instead.
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