Discussion
Assertion (A): A sharp leading edge is used on a supersonic aerofoil.
Reason (R): A sharp edge allows the bow shock to remain attached and weak.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second is the reason for the first. A small deflection can be turned by a weak attached oblique shock, whereas a blunt edge forces a detached bow wave with a strong nearly normal segment and a heavy wave drag penalty.
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