Question

How much horsepower would a vehicle need to arrive at a destination before the sound of its engine does given the following:

• The weight of the vehicle is estimated at 4451 lbs
• Assume no wind
• Assume no driveline losses
• A car traveling at the speed of sound (760 MPH --> 1116.4ft/sec)

What you need to know:

• HP = Fsum x V/hp
• F drag = 1/2 pv^2 CdA
• F rolling resistance = Crr x Weight
• F sum = F drag + F rolling resistance
• Cd = .398
• A = 26.72 Ft^2
• Crr = .015
• p= .002377 slugs/ft^3

Answer 1