Discussion
Assertion (A): A trip strip is fitted to a wind-tunnel model.
Reason (R): At model Reynolds numbers the boundary layer would otherwise stay laminar much further aft than at full scale.
Select the correct answer from the options below.
Answer: C
Both are true and the second explains the first. Without the strip the model would carry an unrepresentatively long laminar run, understating friction drag and misplacing separation. Sizing and siting the strip correctly is delicate, and a badly chosen one corrupts the data it was meant to fix.
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