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The fuselage cross-section of a pressurised transport is close to circular because

  • A.Pressure is carried in pure hoop tension
  • B.A circle gives the largest cabin floor area
  • C.Circular sections are cheapest to manufacture
  • D.Circular sections have the lowest drag

Answer: A

Any departure from circular means the shell must carry pressure partly in bending, which is far heavier than membrane tension. Where a wider cabin is wanted the answer is usually two arcs meeting at the floor rather than an ellipse.

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