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Exercise 4: Drag and Applications




Question;Exercise;4: Drag and Applications;Part 1: Drag;Givens;(Questions 1 ? 6);Weight (W) 15,000 lb CDP 0.021;Wing Area (S) 230 ft2 CLmax 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, VS. 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);CL;CD;CL;/ CD;DP;(lb);DI;(lb);DT;(lb);VS;120;140;160;180;190;200;220;240;260;Equations for Table;q =;CL;=;CDi;=[1/ (?eAR)] CL2;CD = CDP;+ CDi CD = CDP;+ [1/;e AR)] CL2 Dp = CDpq S;Di = CDi q S = [1/;e AR)] CL2 q S Dt = Di + Dp = CD;q S;1. Determine VSTALL (Stall speed in KTAS);2. Determine DMIN (Minimum total drag in pounds);3. Determine VDMIN (Speed in KTAS at minimum drag);4. Determine the parasitic drag at DMIN;(pounds);5. Determine the induced drag at DMIN;(pounds);6. Find Glide Ratio at VDMIN;Part 2;Applications of Lift and Drag;Givens;(Questions 7-11);Weight (W) = 15,000 lb;Wing Area (S) = 230 ft2;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?


Paper#60800 | Written in 18-Jul-2015

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