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Thread: Those funny little things on roofs Reply to Thread
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Topic Review (Newest First)
10-06-2011 06:27 PM
mmmoose I wonder if Mazda removed the unicorn vortex spike thingy from the 2010 happyface Mazda3 due to cost cutting measures...
10-06-2011 04:05 PM
apagios Damn, and I always thought it was so the Evo 8 could double as a salad shooter at high speed, just hit the gas and toss a head of lettuce on your roof!

Good paper link!

Another cool example of vortex generation is the intake on the Mazda Furai concept car. It had a spike sticking up off the roof which generated vortices and funneled them directly into the intake!

http://www.roadandtrack.com/auto-sho...-furai-concept
"The sharp element you see protruding from the roof is called an Air Fang, and was designed by the guys at Swift to optimize ram air induction. The air split by the Air Fang creates vortices which force air down into the intake. "

10-06-2011 03:31 PM
mmmoose Oh god, please tell me Pep Boys isn't selling those things in chrome with 3M tape application. I'm afraid to even look online...

EDIT: too late, I caved into my curiosity. Link.
10-06-2011 02:42 PM
azdamay And it makes them lame, but I believe you already stated you liked the car MINUS the stick on doodads.
10-06-2011 02:37 PM
lyonsroar
Quote:
Originally Posted by SkyPilot View Post
^those were added by the owner.
Yes? And?
10-06-2011 02:09 PM
SkyPilot ^those were added by the owner.
10-06-2011 01:10 PM
lyonsroar Found a vortex generator on a Kia Forte Koup today. Things freakin' clean. I lurve it...apart from the vortex generators...

10-06-2011 12:00 PM
mikebontoft
Quote:
Originally Posted by Grumpy View Post
It's just an old airline Boeing training course joke!
I should have known lol.

If anything it would create AC lol
10-06-2011 10:17 AM
wrc_fan
Quote:
Originally Posted by sassynapoleon View Post
My layman's understanding is that these work similarly to the way the dimples in a golf ball work. That is, they create turbulence. Turbulent airflow is less desirable than laminar airflow, all things being equal, however turbulent airflow tends to "stick" to a surface better and prevent separation, so it's viewed as the lesser of two evils. Separated airflow means you're carrying around a pocket of air that makes the apparent size of your object (a vehicle in this case) larger, increasing your coefficient of drag and making downstream airflow devices (e.g. wings) less effective.
Uh, no, way off in this case. They generate vortices (hence the name), which delay flow seperation from the body of the vehicle. Flow seperation is bad, especially when you have a big wing that you would like to have providing downforce on your rally car.

In the paper, you read from the findings that the generators reduce drag and increase downforce, by delaying flow seperation, and increasing the velocity profile over the wing. The CFD profile plot on page 5 really says it all.

The VG's were sized specifically for this unique application (evo 8) and are most effective with the rear wing.
10-06-2011 09:51 AM
mmmoose Because racecar!!! That's all you need to know.
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