Discussion
Assertion (A): Vortex generators are often fitted as a retrofit to cure buffet or restore control authority.
Reason (R): They mix high-momentum air into the boundary layer, delaying separation.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second explains the first. Because they are small, cheap and external, they can be added after flight testing reveals a separation problem, which is exactly how many transport aircraft acquired them. The cost is a small permanent drag increment.
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