User:WikiIsaacPedia/Automobile drag coefficient

Example drag coefficients[edit]
The average modern automobile achieves a drag coefficient of between 0.25 and 0.3. Sport utility vehicles (SUVs), with their typically boxy shapes, typically achieve a C d =0.35–0.45. The drag coefficient of a vehicle is affected by the shape of body of the vehicle. Various other characteristics affect the coefficient of drag as well, and are taken into account in these examples. Many sports cars have a surprisingly high drag coefficient, as downforce implies drag, while others are designed to be highly aerodynamic in pursuit of a speed and efficiency, and as a result have much lower drag coefficients. '' Sports cars that try to reduce drag employ devices such as spoilers, wings, diffusers, and fins to reduce drag and increase speed in one direction. ''

Note that the C d  of a given vehicle will vary depending on which wind tunnel it is measured in. Variations of up to 5% have been documented and variations in test technique and analysis can also make a difference. So if the same vehicle with a drag coefficient of C d =0.30 was measured in a different tunnel it could be anywhere from C d =0.285 to C d =0.315.