Discussion
Four fuselage layouts considered for a 180-seat aircraft.
| Layout | Abreast | Rows | Length (m) | Fineness |
|---|---|---|---|---|
| W | 4 | 45 | 44.0 | 13.8 |
| X | 5 | 36 | 38.0 | 10.9 |
| Y | 6 | 30 | 33.5 | 8.6 |
| Z | 7 | 26 | 31.0 | 7.2 |
Which layout best balances wetted area against afterbody drag for a narrow-body?
Answer: C
Layout Y sits at a fineness ratio of 8.6, comfortably inside the usual eight to twelve band, and six abreast with a single aisle is the established narrow-body arrangement. W is excessively long and Z would need a second aisle at seven abreast.
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