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Following diagram represents? (a)Typical low wave drag design

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Following diagram represents?

(a) Typical low wave drag design

(b) Lowest lift design

(c) Highest area design

(d) Highest drag design

This question was addressed to me during an internship interview.

This interesting question is from Configuration Layout topic in division Configuration Layout Considerations of Aircraft Design

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The correct answer is (a) Typical low wave drag design

The best I can explain: Above diagram is showing typical low wave drag design of an aircraft. It is called coke-bottling. It is used to improve the wave drag properties by altering the volume distribution. It can be used to reduce drag up to 50%.

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