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Unformatted text preview: downwash is computed at the point (x 2 , y j ) in the center of each of these segments. For this assignment, assume the values of y j are known (you will derive the y j values in the first part of your computer project). So, 1. find the downwash at y j , written as a function of x i , y i , i , x 2 , y j , and j (applying the result of the first part of HW 11 might be a good start) 2. then find the induced drag per span at y j , (note the sign correction from the lecture of 9/30) 3. multiply by the length of the spanwise segment to get a drag force on that segment, 4. add up all the induced drags on the segments to get total drag. Steps 1, 2, and 3 can be solved analytically, assuming that i , j , and y j are known. Step 4 is a summation over N segments. (see figure on next page) x y A i y=b i /2 y=-b i /2 B i (x j , y j ) (x 2 , y 2 ) j...
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- Fall '09
- Aerodynamics, Wing, Lift, yj, single horseshoe vortex