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Which of the following is part of the fuel-fraction method?

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Which of the following is part of the fuel-fraction method?

(a) Developing lofting

(b) Empty weight fraction

(c) Calculating individual mission segment weight fraction

(d) Finding volume ratio

I got this question in final exam.

The above asked question is from Conceptual Sketch Sizing topic in chapter Conceptual Sketch Sizing of Aircraft Design

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Right option is (c) Calculating individual mission segment weight fraction

Explanation: Lofting is a vital part of preliminary design phase. The fuel fraction method is very simple and basic approximation method. Here, mission profile is divided and then for every individual phase we calculate mission segment weight fraction.

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