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If damping ratio is 0.05 then, find the lift to drag ratio. Consider 2-degree phugoid approximation.

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If damping ratio is 0.05 then, find the lift to drag ratio. Consider 2-degree phugoid approximation.

(a) 14.14

(b) 20

(c) 25

(d) 0.05

I have been asked this question in a national level competition.

The origin of the question is Dynamic Stability topic in portion Stability, Control, and Handling Qualities of Aircraft Design

1 Answer

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Correct answer is (a) 14.14

For explanation: Given damping ratio d = 0.05

Lift to drag = 0.707/d = 0.707/0.05 = 14.14.

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