Discussion
The design wheel, or design spiral, expresses that
Answer: A
Correct answer: Disciplines are revisited with more fidelity
The design wheel represents the process as a spiral through aerodynamics, weights, propulsion, structures, performance and cost, returning to each discipline on every turn but at a higher level of detail than before. The point is that a single pass is impossible: a weight estimate changes the wing area, which changes the drag, which changes the fuel, which changes the weight again. The design converges by circling, and it is complete when a turn produces no significant change.
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