Wind Chart/Diagram, How's It Look? Options

[Bigmeanbulldog55]

I was driving back to college from home, and it was raining out. I noticed that the back glass kept dry even in the heavey rain. This just made me curious to see a wind chart for the celica. It's a hachback with a wing. Any have this? And I was also wondering how functional this wing really is? Any know? Thanks.

[Akimbo]

Here I'll type up what I have from this book.

As the name implies this device spoils the airflow over the top half of the car t the trailing edge of the car's upper surface. The spoiler can keep airflow from tumbling and creating a swirling vortex behind the car. This is important for a couple of reasons - without a spoiler, siwrling air behind the car can create both;
-Drag (which can keep the car from moving forward as quickly as possible). Drag is expressed as a numeric coefficient of wind resistance.
-Lift (which reduces the car's grip on the road at speed)

Manufacturers have been known to add spoilers to cars that didn't have them in the original design. The Audi TT was released first without any spoiler. It could only be purchased with a spoiler after reports began deriding its high-speed stability and inherent rear lift.

-Wings-
A WING on a car is an upside down version of the wing on an airplane. Instead of lifting, the upside-down pushes the car against the ground.
Because the wing must catch an undisturbed flow of air, most wings are mounted on raised pedestals.
Many wings can be adjusted for rake (vertical angle) so that the amount of downforce (and corresponding drag) can be fine-tuned for a specific application. This is often accomplished with adjustment holes that allow you to alter the angle of the wing's plane for adjustable levels of resistance.

Got that from Car Hacks & Mods for Dummies by David Vespremi.