Discussion
A fuselage is stretched from \( 38 \) m to \( 44 \) m at constant \( 4 \) m diameter. Its fineness ratio becomes
Answer: A
Dividing, \( 44/4 = 11.0 \), still within the usual range though approaching its upper end. Beyond about twelve the added wetted area and the shrinking rotation angle both start to cost more than the extra capacity is worth, which is what limits how far a family can stretch.
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