Discussion
Assertion (A): Laminar-flow aerofoils are difficult to exploit in service.
Reason (R): Their favourable pressure gradient survives only over a narrow band of lift coefficient.
Select the correct answer from the options below.
Answer: B
Both are true and the second is the reason for the first. Outside the drag bucket the stagnation point moves and transition jumps forward, and in practice insects, rain and manufacturing waviness destroy the laminar run in any case. The measured benefit is often far below the wind-tunnel promise.
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