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Old 11-27-2007, 11:30 PM   #1 (permalink)
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Chevy Cobalt (E85) Bonneville speed record (aero mods)

From: http://www.worldcarfans.com/news.cfm...eak-new-ground
and http://www.autoblog.com/2006/08/14/c...-speed-record/



Of note:
  • full grille block
  • lowered ride height
  • smooth wheel covers
  • narrow (4.5 in) wheels
  • full belly pan
  • no side mirrors
  • no windshield wipers
  • extended trunk plane (presumably to reduce lift & drag)
There's another pic from the rear of the car at the first link, with zooms.

If I'm not mistaken, the vertical spoilers on the roof are there to prevent lift in the event the car gets sideways at speed.

156.073 mph. Fuel consumption figures not provided

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Old 03-23-2008, 10:43 AM   #2 (permalink)
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you can read this very interesting article

http://www.gmperformancedivision.com...obalt_Art6.pdf

what of tasks?
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Old 03-23-2008, 10:45 AM   #3 (permalink)
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ah, a question: whats is it the utility of rails rack?

this aerodynamics elements they are used in nascar car.
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Old 03-23-2008, 10:48 AM   #4 (permalink)
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Quote:
Originally Posted by fabrio. View Post
ah, a question: whats is it the utility of rails rack?

this aerodynamics elements they are used in nascar car.
" If I'm not mistaken, the vertical spoilers on the roof are there to prevent lift in the event the car gets sideways at speed "

Welcome to the site Fabrio !
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Old 03-23-2008, 10:56 AM   #5 (permalink)
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thanks for your answer and for the welcome .Cd
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Old 03-23-2008, 11:01 AM   #6 (permalink)
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not any application for turbolence or deviation of the airflow from lateral area at the top of roof?
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Old 03-23-2008, 11:06 AM   #7 (permalink)
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Fantastic article Fabrio !
Thanks again for posting the link !

" what of tasks? "

Can you be more specific ?
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Old 03-23-2008, 12:02 PM   #8 (permalink)
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I can try: upper the car the pressure is lower of lateral area (comprehensible?).
Causes this pressure difference, (in my mind), the air come from lateral at upper of car (probably little quote of air flux).
This diverted flow is cause vortices and induced drag.....it is an ipotetical opinion and I whonder an opinion for this one.
Similar case, is the deviaton flow from lateral at the car underbody

thanks
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Old 03-23-2008, 01:25 PM   #9 (permalink)
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So what you are asking is if the air pressure on the top of the car is lower than the sides ( lateral area ) ?
And you are wondering if this is what is causing the vortices and induced drag behind the car ?
Also, you are wondering about effect that the airflow has as it travels from the side of the car body and under the car ?

Am I understanding correctly ?
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Old 03-23-2008, 01:56 PM   #10 (permalink)
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Quote:
Originally Posted by .Cd View Post
So what you are asking is if the air pressure on the top of the car is lower than the sides ( lateral area ) ?
I think than a quote the air travel from the side car on the top of car, and then the roof rail can help this travel .

Quote:
Originally Posted by .Cd View Post
And you are wondering if this is what is causing the vortices and induced drag behind the car ?
Also, you are wondering about effect that the airflow has as it travels from the side of the car body and under the car ?

Am I understanding correctly ?
Not, I do not are amazed, only, I whont to know if my think is it correctly!

thanks for answer, you are helpming me, to correct my English

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