Discussion
A double-bubble fuselage section consists of
Answer: B
Correct answer: Two circular arcs tied at the floor
A double-bubble section is two circular arcs of different radii meeting at the floor, with the floor beams acting as a tie to carry the outward pull where the arcs join.
The arrangement keeps each arc in membrane tension, so pressure is carried without bending, while giving a taller section than a single circle of the same width - useful where a hold must sit under a wide cabin. It is one pressure vessel, not two, and the floor tie is what makes it work.
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