Discussion
Assertion (A): Model tests at low Reynolds number can understate the maximum lift coefficient of a full-size wing.
Reason (R): A boundary layer at higher Reynolds number resists separation more effectively.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. At higher Reynolds number the boundary layer is thinner relative to the chord and more likely to be turbulent, so it carries more momentum near the wall and resists the adverse gradient better. A low Reynolds number model therefore separates earlier and shows a lower maximum lift than the full-size wing will achieve.
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