Discussion
Consider the following statements about the constraint diagram:
1. Its axes are wing loading and thrust-to-weight ratio.
2. The feasible region satisfies every constraint at once.
3. The design point is normally at the centre of the feasible region.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statement 1 is correct: the axes are wing loading horizontally and thrust-to-weight vertically. Statement 2 is correct: the feasible region is the intersection of the acceptable side of every constraint, so it satisfies them all at once.
Statement 3 is false. The design point is normally placed at a corner of the feasible region, not at its centre, because thrust and wing area both carry weight and fuel penalties and are pushed to their limits. A central point would carry permanent performance margin nobody asked for.
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