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What is the disadvantage of short and fat fuselage?

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in Aircraft Design by (701k points)
What is the disadvantage of short and fat fuselage?

(a) Higher supersonic wave drag

(b) Higher incompressible wave drag

(c) Lower supersonic wave drag

(d) Lower wetted area

The question was asked in a job interview.

The question is from Configuration Layout topic in chapter Configuration Layout Considerations of Aircraft Design

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The correct choice is (a) Higher supersonic wave drag

To elaborate: Wave drag is the supersonic phenomena. Wave drag does not exist for incompressible flow. Short and fat fuselage will offer minimization of the wetted area. This gives advantage in terms of friction properties. However, it suffers from higher wave drag at supersonic speeds.

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