One of the most beautifully streamlined airplanes ever designed is the North American P-51 Mustang shown in Fig. 4.46. The Mustang has one of the lowest minimum drag coefficients of any airplane in history: CD = 0.0163. The wing plan form area of the Mustang is 233 ft2. Using the result from Prob. 5.32, show that the drag area for the Mustang is 3.8 ft2; that is, drag on the whole P-51 airplane is the same as the drag on a :flat plate perpendicular to the :flow of an area of only 3.8 ft2. Prob. 5.32 In some aerodynamic literature, the drag of an airplane is couched in terms of the “drag area” instead of the drag coefficient. By definition, the drag area,/, is the area of a fiat plate at 90° to the flow that has a drag force equal to the drag of the airplane. As part of this definition, the drag coefficient of the plate is assumed to be equal to 1, as shown in Prob. 5.31. If CD is the drag coefficient of the airplane based on wing plan form area S, prove that .
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