Discussion
Match each term in List I with its meaning in List II.
List I
A. Critical Mach number
B. Drag-divergence Mach number
C. Subsonic leading edge
D. Vortex breakdown
List II
1. Where drag begins to rise sharply
2. Where sonic flow first appears on the surface
3. Sudden loss of the suction a leading-edge vortex was producing
4. An edge swept behind the Mach cone
Select the correct match.
Answer: B
These four terms cover the vocabulary of the topic. The first two are distinct Mach numbers and must not be conflated: sonic flow appears first, and only later does the shock grow strong enough to force the drag up sharply.
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