Discussion
Fuselage fineness ratio is defined as
Answer: A
Correct answer: Length divided by maximum diameter
Fineness ratio is \( L/D \), a dimensionless measure of slenderness, and transports typically fall between about 8 and 12.
It expresses a drag trade. Too low and the afterbody must close quickly, so the flow separates and pressure drag rises; too high and the length brings wetted area with no pressure benefit, so skin friction dominates. The optimum sits between, which is why the range is as narrow as it is.
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