Rear spoiler

A rear spoiler for an automotive vehicle having a roof and a vehicle back surface comprised of a back surface of the roof and a substantially aligned rear window, wherein the rear spoiler has a generally triangular cross-section and is spaced from the back surface and has an inner surface that is parallel to the vehicle back surface, said inner surface having a lower portion with a protrusion which projects toward the vehicle back surface and forms an angle of 20.degree. or greater with respect to said inner surface, an outlet having an outflow width between the inner surface of the rear spoiler at the protrusion and the vehicle back surface, and an inlet spaced from the outlet and having an inflow width between the inner surface of the rear spoiler and the vehicle back surface, wherein the ratio of outflow width to inflow width is 0.5.about.0.9;

• the rear spoiler having a vehicle velocity ratio (V.sub.1 /V.sub.2 .times.100) of 30 or greater, wherein V.sub.1 is the velocity of the vehicle and V.sub.2 is the velocity of airflow exiting at the outlet of the rear spoiler;
• and
• the roof having a first top surface that is substantially horizontal and the rear spoiler having a second top surface that is substantially horizontal and is parallel to the first top surface to provide an amount of projection of -1 mm or greater which is the distance between the second top surface of the rear spoiler and a reference plane extending rearwardly substanially horizantally from approximately the first top surface of the vehicle roof.

A rear spoiler for an automotive vehicle having a roof and a vehicle back surface comprised of a back surface of the roof and a substantially aligned rear window,

• the roof comprising a first top surface and the back surface of the roof, the first top surface being substantially horizontal,
• wherein the rear spoiler has a generally triangular cross-section and is constructed to be mounted adjacent to and spaced from the back surface of the roof and comprising an inner surface and a second top surface, the second top surface being substantially horizontal and parallel to the first top surface, the inner surface of the rear spoiler having a lower portion with a protrusion which projects toward the vehicle back surface and forms an angle of 20.degree. or greater with respect to said inner surface,
• an inlet having an inflow width between the inner surface of the rear spoiler and the back surface of the roof, and an outlet spaced from the inlet and having an outflow width between the inner surface of the rear spoiler at the protrusion and the vehicle back surface, and
• wherein the rear spoiler provides a vehicle velocity ratio (V.sub.1 /V.sub.2 .times.100) of 30 or greater, where V.sub.1 is the velocity of the vehicle and V.sub.2 is the velocity of airflow exiting at the outlet of the rear spoiler,
• a ratio of outflow width to inflow width of 0.5.about.0.9, and
• an amount of projection of -1 mm or greater which is the distance between the substantially horizontal second top surface of the rear spoiler and a reference plane extending rearwardly and substantially horizontally from approximately the substantially horizontal first top surface of the vehicle roof.