An aircraft with elliptic wing planform has parasite drag coefficient as 0.9. Lift coefficient of wing is 1.8 and aspect ratio is 8.5. Find total drag coefficient for the wing.(a) 1.021(b) 0.9(c) 0.121(d) 0.25This question was addressed to me in class test.The query is from Wing Geometry-2 topic in section Airfoil and Geometry Selection of Aircraft Design

An aircraft with elliptic wing planform has parasite drag coefficient

1.	An aircraft with elliptic wing planform has parasite drag coefficient as 0.9. Lift coefficient of wing is 1.8 and aspect ratio is 8.5. Find total drag coefficient for the wing.(a) 1.021(b) 0.9(c) 0.121(d) 0.25This question was addressed to me in class test.The query is from Wing Geometry-2 topic in section Airfoil and Geometry Selection of Aircraft Design
Answer» Right CHOICE is (a) 1.021 To elaborate: Given, ELLIPTIC wing, parasite drag coefficient CD0 = 0.9 Lift coefficient CL = 1.8, Aspect ratio AR=8.5 Now, TOTAL drag coefficient = Parasitic drag coefficient (CD0) + induced drag coefficient (CDi) CDi = CLCL / (ᴨeAR) = 1.81.8 / (ᴨ18.5) = 0.121 Hence, Total drag coefficient = CD0 + CDi = 0.9 + 0.121 = 1.021.

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