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# Page 1 of 3 This document was developed for online learning in ASCI 309. File name: Ex_4_Drag Updated: 8/13/2014 Exercise 4: Drag and Applications...

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Page 1 of 3 This document was developed for online learning in ASCI 309. File name: Ex_4_Drag Updated: 8/13/2014 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 Page 2 of 3 This document was developed for online learning in ASCI 309. File name: Ex_4_Drag Updated: 8/13/2014 Equations for Table: q = ? ? ? 2 295 ∕  C L = qS W 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 Page 3 of 3 This document was developed for online learning in ASCI 309. File name: Ex_4_Drag Updated: 8/13/2014 Part 2: Applications of Lift and Drag Givens (Questions 7-11): Weight (W) = 15,000 lb Wing Area (S) = 230 ft 2 Altitude = Sea Level Temperature Standard (The Given Figure below is not exactly the same aircraft as above, but close) Figure 1.13 from Aerodynamics for Naval Aviators (1965). 7. What is the Angle of Attack at Stall for the aircraft in Figure 1.13? 8. What is the airspeed associated with initial onset of stall? (KEAS) 9. If the gross weight is increased by 10%, how would the stall speed change? 10. What Angle of Attack is associated with Best L/D? 11. What would be the best Glide Ratio for this aircraft?

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Page 1 of 3
This document was developed for online learning in ASCI 309.
File name: Ex_4_Drag
Updated: 8/13/2014 Exercise 4: Drag and Applications
Part 1: Drag
Givens (Questions 1 – 6):
Weight...

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