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What do you mean by longitudinal control lines?

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in Aircraft Design by (701k points)
What do you mean by longitudinal control lines?

(a) Smooth lines which controls overall shape of the conic cross-section

(b) Lines which expands to vertical direction only

(c) Lines which go in horizontal direction only

(d) Line which can be expanded only in lateral direction

This question was posed to me during a job interview.

Origin of the question is Configuration Layout topic in chapter Configuration Layout and Loft of Aircraft Design

1 Answer

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Correct answer is (a) Smooth lines which controls overall shape of the conic cross-section

Easy explanation: Longitudinal control lines are smooth lines through which conic curves are connected. Since, it connects all different conics, it will control the overall shape of the body itself during lofting.

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