Discussion
Assertion (A): Blockage corrections grow rapidly as the model is made larger relative to the test section.
Reason (R): A larger model leaves less area for the flow, forcing the surrounding air to accelerate.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Continuity in a confined section means the measured forces come out too high. Keeping frontal area below about five per cent of the section keeps the correction a modest adjustment rather than a dominant one.
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