A truck weighing 68,000 lb is moving uphill of grade 5% at a speed of 70 mph. The air temperature is 60F and the barometric pressure is 26 in Hg. The truck is 8 ft wide by 13.5 feet high. The truck has radial-ply tires.
i) Estimate the aerodynamic drag coefficient if front face is a rectangular
plate.
ii) Aerodynamic drag force
iii) The rolling resistance
iv) The road load horsepower
v) Propose a better front face design to reduce the aerodynamic drag
coefficient. Based on your design what are the aerodynamic drag coefficient and drag force for the above data. Sketch the isometric view of the new front face of truck.