Question

Problem 5 (20 points) - Each part is independent (a) A finite wing with an aspect ratio of 9 has an elliptical lift distribution. The lift slope for the airfoil section is 0.16/degree. Calculate and compare the lift slope for: (i) a straight wing, and, (ii) a swept wing with a half-chord line sweep of 40°. (b) An NACA airfoil has been designated the number 3407. Using this designation, find the primary dimensions of the airfoil (in meters) if the chord length is 1.2 meters.

Answer 1

for Solution :- Using Helmbold equation and „Swept wings. both straight a] For the straight wing ao 2 ao ++ Google + TAR where ao - Slope - 0.16/degree = 0.16 x 180 T ao=9.17 rad AR - Aspect Ratio 9.17 a (3:47)+ 9.17 IT x 9 9.17 TX 9 a = 6.67 /rad b] For the swept wing a ao COSA 2 (9.2 ao COSA TT AR ao COSA TAR A = 40° ao COSA = 9.17 x cos 40° 7.025/rad au COSA 2.025 0.2484 TAR 1) X9 7.025 1+ (0.248.4)2 + 0.2484 5.4935 / radi By comparing both wings, it is found that the swept wing has reduced © Ն Ե Է slope. we сал. answer one Note:- As per HomeworkLib policy, one question post. will part (b) Separately the Thanx. Please post for help you same.