At the elevated speeds Porsche cars are designed to achieve, airflow can bounce a car around like a paper cup in a hurricane. Or it can be coerced into promoting better handling, channeled into cooling the brakes or tamed to ventilate the cabin.
At speed, the ground-effects floorpan helps push the body to the pavement
to enhance traction. The leading edge
of the bumper cleanly pushes air out of the way to reduce drag. Air ducts located below the bumper direct cool
air to the brakes to increase fade resistance. And the "stale" air coming off the brakes isn't allowed to build up in
the wheel wells, causing stall and reducing airflow. Instead, the aerodynamic wheel spokes create a vacuum effect
that draws the air out and discharges it into the airstream around the body.
The new Targa is another achievement of the aerodynamicists at Porsche.
At high speeds, moving air creates a
tremendous aerodynamic pull on the side glass of a car's roof structure. Over a surface area four times as large,
similar forces act on the Targa's glass roof. Yet because the shape and size of the supporting pillars were carefully
refined, the Targa roof remains a consistently stable surface, annoying wind noise drastically reduced.
When the roof is retracted, a power-operated wind deflector in the windshield
header serves to dramatically
reduce interior wind buffeting and turbulence.