Discussion
Which of the following is NOT normally a constraint on a constraint diagram?
Answer: B
Correct answer: Fatigue life of the wing spar
Fatigue life is a structural matter, governed by material choice, detail design, stress levels and inspection intervals. It cannot be expressed as a relation between wing loading and thrust-to-weight, so there is no line to draw for it.
The other three all can be expressed in those variables and are standard constraints: landing field length as a vertical line, takeoff field length as a line rising to the right, and cruise speed at altitude as a curve from matching thrust to drag. The diagram carries performance requirements, not structural ones.
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