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Fineness ratio of fuselage is ratio of _____________

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Fineness ratio of fuselage is ratio of _____________

(a) fuselage length and maximum diameter

(b) fuselage diameter

(c) fuselage diameter and maximum length

(d) length of fuselage and weight

The question was asked during a job interview.

This is a very interesting question from Geometry Sizing in section Initial Sizing of Aircraft Design

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The correct choice is (a) fuselage length and maximum diameter

Easy explanation: Fineness ratio is defined as the length of the fuselage to the maximum diameter of the fuselage. If fuselage has a different cross section then, equivalent diameter is used for fineness ratio.

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