Discussion
Constraint analysis is normally carried out
Answer: B
Correct answer: Early in conceptual design
Constraint analysis is one of the first quantitative steps in conceptual design, done as soon as the requirements are known. It needs only performance requirements and estimates of aerodynamic and propulsive parameters, and it produces the wing area and installed thrust.
Those two numbers are inputs to almost everything downstream - structural layout, fuel volume, weight estimation, engine selection - so deferring the analysis would leave the rest of the design without a basis. It is repeated as estimates improve, but the first pass comes before any structure is drawn, let alone built or flown.
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