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Choose appropriate option for cruise mission leg weight fraction.

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Choose appropriate option for cruise mission leg weight fraction.

(a) Breguet endurance formula

(b) Breguet range formula

(c) Cruise invert method

(d) Breguet approximation

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Right option is (b) Breguet range formula

To explain: Breguet endurance formula is used to determine the endurance of aircraft. Range formula is used to calculate range for respective mission. In simple sizing method we consider that the cruise is ending with descent. Also, we assume that cruise range has accounted for descent as well. Hence, we use range formula to determine fuel fraction.

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