Discussion
Assertion (A): Wind-tunnel models are often tested both upright and inverted.
Reason (R): Inverting the model reverses the sign of the flow angularity error while leaving the true forces unchanged.
Select the correct answer from the options below.
Answer: A
Both are true and the second explains the first. Averaging the two runs cancels the angularity contribution, and a difference between them is itself a warning that something in the setup needs attention. Half a degree of misalignment can bias drag by ten per cent or more.
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