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Which of the following is correct in accordance to diagram?

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Which of the following is correct in accordance to diagram?

(a) Aspect ratio of 1 is highest

(b) Aspect ratio of 2 is maximum

(c) Aspect ratio of 3 is maximum

(d) Similar aspect ratio

I got this question by my college professor while I was bunking the class.

My question is from Wing Geometry-2 topic in division Airfoil and Geometry Selection of Aircraft Design

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The correct answer is (a) Aspect ratio of 1 is highest

Explanation: High aspect ratio will give higher value of maximum lift coefficient. As shown in figure for -1, maximum lift coefficient is highest and hence, aspect ratio of 1 will be highest. Similarly for -3 it is lowest and hence, aspect ratio of 3 will be minimum.

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