What is the aspect ratio of a rectangular wing with wingspan 20 meters and chord length 2 meters?

• A. 2
• B. 20
• C. 10
• D. 15

Answer: (C)

For a rectangular wing, how slender it is (the aspect ratio) comes from comparing its span to its chord. The standard relation reduces to AR = b / c, since the wing area S = b × c and AR = b^2 / S = b^2 / (b c) = b / c. With a wingspan of 20 meters and a chord of 2 meters, AR = 20 / 2 = 10. So the wing’s aspect ratio is 10.