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Page 1 of 4 Exercise 4: Drag and Applications Part 1: Drag Givens (Questions 1 - 6): Weight (W) Wing Area (S) Aspect Ratio (AR) Span Efficiency (e)...

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Page 1 of 4 Exercise 4: Drag and Applications Part 1: Drag Givens (Questions 1 – 6): Weight (W) 15,000 lb C DP 0.021 Wing Area (S) 230 ft 2 C Lmax at Stall 1.5 Aspect Ratio (AR) 5.3 Note : Assume the drag polar is a parabola Span Efficiency (e) 0.85 Temperature Standard Altitude Sea Level Complete the following table for this particular typical transport jet. Start the table at stall speed, V S . Then answer the questions at the end using the values from the table. You can use an excel spreadsheet to create the answers for the table. V (KTAS) q (psf) C L C D C L / C D D P (lb) D I (lb) D T (lb) V S 120 140 160 180 190 200 220 240 260 This document was developed for online learning in ASCI 309. File name: Ex_4_Drag Updated: 5/30/2014
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Page 2 of 4 Equations for Table: q = C L = C Di =[1/ (πeAR)] C L 2 C D = C DP + C Di C D = C DP + [1/ (e AR)] C L 2 Dp = C Dp q S Di = C Di q S = [1/ (e AR)] C L 2 q S Dt = Di + Dp = C D q S 1. Determine V STALL (Stall speed in KTAS) 2. Determine D MIN (Minimum total drag in pounds) 3. Determine V DMIN (Speed in KTAS at minimum drag) 4. Determine the parasitic drag at D MIN (pounds) 5. Determine the induced drag at D MIN (pounds) 6. Find Glide Ratio at V DMIN This document was developed for online learning in ASCI 309. File name: Ex_4_Drag Updated: 5/30/2014
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Book1.xlsx

V
(KTAS)
VS
120
140
160
180
190
200
220
240
260 q
(psf) CL 48.813559322 1.3360507246
66.4406779661 0.981588287
86.7796610169 0.751528533
109.830508475 0.593800322
122.372881356 0.532939901...

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