Figure 1b shows the induced drag coefficient (CDi) versus lifting coefficient (CL) results from lifting line analysis of three finite wings all with the same, airfoil and no geometric twist. Three finite wings are Elliptic wing planform with aspect ratio AR=10, Elliptic wing planform with aspect ratio AR*20 and Rectangular wing with aspect ratio AR=10.

(5 % each)

1. Which curve (D, E or F) is the curve for Elliptic wing planform with AR=10?
2. Which curve (D, E or F) is the curve for Elliptic wing planform with AR=20?
3. Which curve (D, E or F) is the curve for Rectangular wing planform with AR=10?

1. Hgure ta shows the lifting curves from a lifting line analysis of 20 airfoil, elliptical wing with aspect ratio AR=5 and elliptical wing with aspect ratio AR=10 alf with the same cambered alrfoit. ( 5% each) (a) Which curve (A,B or C) is the lifting curve for 2D airfoil? (b) Which curve (A,B or C) is the lifting curve for Elliptical wing with aspect ratio AR=5 ? a) A, 2D airfoil slop is higher than elliptal wing. b) C, increasing low aspect ratio and slop will below c) B, 10AR is higher than SAR, the slop should be higher o compared to C Figure Ib Figure 1b shows the induced drag coefficient (CDi) versus lifting coefficient (CL) results from lifting line analysis of three finite wings all with the same airfoil and no geometric twist. Three finite wings are Elliptic wing planform with aspect ratio AR3=10, Elliptic wing planform with aspect ratio AR=20 and Rectangular wing with aspect ratio AR=10. ( 5% each) (a) Which curve (D, E or F) is the curve for Elliptic wing planform with AR=10 ? (b) Which curve (D, E or F) is the curve for Elliptic wing planform with AR=20 ? (c) Which curve (D, E or F ) is the curve for Rectangular wing planform with AR=10