Discussion
A supersonic transport cruises at \( M = 2.0 \) with a leading-edge sweep of \( 65 \) degrees. Its leading edge is
Answer: A
At Mach 2 the Mach angle is 30 degrees, so a sweep beyond 60 degrees hides the edge inside the cone. At 65 degrees it is comfortably subsonic, which is why Concorde could use a rounded leading edge on its ogival delta and recover useful leading-edge suction in cruise.
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