1424Drag coefficient

The aerodynamic drag coefficient is a measure of the effectiveness of a streamline aerodynamic body shape in reducing the air resistance to the forward motion of a vehicle. A low drag coefficient implies that the streamline shape of the vehicle's body is such as to enable it to move easily through the surrounding viscous air with the minimum of resis tance; conversely a high drag coefficient is caused by poor streamlining of the body profile so that there is a high air resistance when the vehicle is in motion. Typical drag coefficients for various classes of vehicles can be seen as follows:

Vehicle type drag coefficient CD

Saloon car 0.22-0.4

Sports car 0.28-0.4

Light van 0.35-0.5

Buses and coaches 0.4-0.8

Articulated trucks 0.55-0.8

Ridged truck and draw bar trailer 0.7-0.9

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