Discussion
A team proposes an elliptical pressure cabin to widen the aircraft without increasing height. The proposal is
Answer: D
Correct answer: Poor, since pressure is then carried in bending
An ellipse has varying curvature, and only uniform curvature allows a shell to carry internal pressure as pure membrane tension. The flatter regions must resist the load in bending, which requires much heavier structure for the same strength.
Where a wider, shallower section is genuinely wanted, the double-bubble achieves it properly: two circular arcs, each still in tension, tied at the floor by beams that carry the outward pull at the junction.
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