Figure 10.30b illustrates the effects of flaps (no flap, single-slotted flap, and double-slotted flap) simultaneously on the lift coefficient, C_{L} and the drag coefficient, C_{D} . Referring to Example Problem 10.23 above, consider an airplane that weighs 30,000 lb with wings with a span width of 25ft and a chord length of 20 ft, as illustrated in Figure EP 10.24. Assume the airplane takes off and lands at sea level (air at standard atmosphere at sea level, \rho = 0.0023768 slugs/ft^{3} ) at an angle of attack of 10^{\circ } . (a) Determine the drag force during takeoff and landing for wings with no flaps. (b) Determine the drag force during takeoff and landing for wings with slotted flaps.