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Keeping all other factors constant if only range of aircraft is increased then, what will be effect on the gross weight of aircraft?

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Keeping all other factors constant if only range of aircraft is increased then, what will be effect on the gross weight of aircraft?

(a) Gross weight will increase

(b) Will decrease

(c) Unchanged

(d) Not depended on range

The question was posed to me in an interview.

My query is from Conceptual Sketch Sizing topic in chapter Conceptual Sketch Sizing of Aircraft Design

1 Answer

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Correct choice is (a) Gross weight will increase

The explanation is: Cruise range will directly affect the fuel fraction of the aircraft. If range is increased then the fuel weight will also increase. Hence, as per W0 = Wcrew + Wpayload + Wfuel + Wempty gross weight will increase.

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