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Which of the following is part of take-off weight estimation?

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Which of the following is part of take-off weight estimation?

(a) Lofting

(b) Drafting

(c) Initial guess of take-off gross weight based on mission specifications

(d) Manufacturing part is first step

I had been asked this question during an internship interview.

This key question is from Conceptual Sketch Sizing topic in division Conceptual Sketch Sizing of Aircraft Design

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Right choice is (c) Initial guess of take-off gross weight based on mission specifications

For explanation: Lofting is definition of skin. Drafting is related to drawing. Based mission specification, crew and payload weight is determined. After which next step is to make an initial guess of take-off gross weight.

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