(Solution Download) A tractor-trailer rig has frontal area A = 102 ft2 and drag coefficient CD = 0.9. Rolling resistance


A tractor-trailer rig has frontal area A = 102 ft2 and drag coefficient CD = 0.9.
Rolling resistance is 6 Ibf per 1000 Ibf of vehicle weight. The specific fuel consumption
of the diesel engine is 0.34 Ibm of fuel per horsepower hour, and drivetrail
efficiency is 92 percent. The density of diesel fuel is 6.9 Ibm/gal. Estimate the fuefl
economy of the rig at 55 mph if its gross weight is 72,000 Ibf. An air fairing systems
reduces aerodynamic drag 15 percent. The truck travels 120,000 miles per year. Call
culate the fuel saved per year by the roof fairing.

 







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