A 1:8 scale model of a tractor-trailer rig is tested in a pressurized wind tunnel. The rig width, height, and length are \(W=0.305 \mathrm{~m}\), \(H=0.476 \mathrm{~m}\), and \(L=2.48 \mathrm{~m}\), respectively. At wind speed \(V=75.0 \mathrm{~m} / \mathrm{s}\), the model drag force is \(F_{D}=128 \mathrm{~N}\). Air density in the tunnel is \(ho=3.23 \mathrm{~kg} / \mathrm{m}^{3}\). Calculate the aerodynamic drag coefficient for the model. Compare the Reynolds numbers for the model test and for the prototype vehicle at \(55 \mathrm{mph}\). Calculate the aerodynamic drag force on the prototype vehicle at a road speed of \(55 \mathrm{mph}\) into a headwind of \(10 \mathrm{mph}\).