Discussion
A wing is swept back \( 35 \) degrees and the aircraft cruises at \( M = 0.85 \). The Mach number the section effectively sees is nearest to
Answer: B
The section responds to the component normal to the leading edge, \( M \cos\Lambda = 0.85 \times \cos 35^\circ = 0.85 \times 0.819 = 0.696 \). The wing therefore behaves as though flying at Mach 0.70, comfortably below where a thin section would run into trouble.
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