Discussion
A very low fineness ratio penalises the design chiefly through
Answer: B
Correct answer: Pressure drag from separation
A short, fat fuselage must close its afterbody over a short distance, which means a steep adverse pressure gradient. The boundary layer cannot follow it, the flow separates, and a wide low-pressure wake forms behind.
Pressure drag then dominates. The remedy is to lengthen the closure, which is why fineness ratios below about 6 are avoided on aircraft that cruise fast. Skin friction is the penalty at the other end of the range.
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