Discussion
Assertion (A): The aerodynamic centre is preferred to the centre of pressure as a reference point.
Reason (R): The pitching moment about the aerodynamic centre does not vary with angle of attack.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. The centre of pressure moves with incidence and recedes towards infinity as lift approaches zero, whereas a fixed point carrying a constant moment is far more convenient for analysis.
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