Discussion
Assertion (A): A constraint diagram is drawn in wing loading and thrust-to-weight terms rather than area and thrust.
Reason (R): Non-dimensional axes make the diagram independent of the aircraft's size.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the practice. Working in ratios rather than in absolute area and thrust lets the same diagram apply whatever the aircraft's weight turns out to be, which matters because the weight is still only an estimate when the analysis is first run.
The design point is chosen in ratio terms and only afterwards dimensionalised, by dividing and multiplying by the design weight. If the weight estimate then changes, the diagram and the design point stand unaltered and only the resulting area and thrust are recomputed.
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