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Find the distance DS in the following diagram. Given contour is parabolic.

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Find the distance DS in the following diagram. Given contour is parabolic.

(a) 3.12

(b) 4.12

(c) 6.2

(d) 0.5

I got this question in final exam.

My question comes from Configuration Layout topic in section Configuration Layout and Loft of Aircraft Design

1 Answer

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The correct answer is (a) 3.12

Easiest explanation: Given, a parabolic contour.

A parabolic shape has conic shape parameter of 0.5.

From figure,

Conic shape parameter CSP = |DS|/|DC|

From Pythagorean Theorem, |DC| = 6.24.

Hence, |DS| = CSP*|DC| = 0.5*6.24 = 3.12.

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