09-23-2004, 10:13 AM
MichaelJComputer Wrote:please educate us.[looking for a picture]
Does not apply to the hatchback focus, but on a "3-box" sedan/coupe
there is a good deal of aerodynamic turbulence caused by the sharp dropoff of the trunk to the rear glass. This creates a large amount of drag directly over the trunk area. A large rear wing will "catch" that air and give it something to "stick" to, smoothing out the airflow and decreasing drag.