Discussion
Fuselage structural weight is driven most strongly by
Answer: D
Correct answer: Wetted area and differential
Two things dominate. Wetted area sets how much skin, stringer and frame there is to build, so weight grows with the surface rather than with the seat count directly.
Pressure differential sets how thick that skin and how heavy those frames must be, since hoop stress is proportional to it. Seat count matters only through the length it demands, and cruise Mach and wing aspect ratio affect other parts of the aircraft.
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