Discussion
Assertion (A): Skin friction is a major target for drag reduction research on transport aircraft.
Reason (R): It accounts for roughly half the cruise drag of such an aircraft.
Select the correct answer from the options below.
Answer: B
Both statements are true and the second is the reason for the first. With half the drag attributable to friction, even a few per cent is worth pursuing, which is why riblets, laminar flow control and surface treatments continue to attract funding despite their in-service difficulties.
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