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    1. #1
      Join Date
      Apr 2009
      Posts
      337

      Aerodynamics : Vortex Generators, Spoilers, etc.

      I was researching Vortex generators (like are on the Mitsubishi Evolution MR) and found this really informative article on Autospeed, then linked to a couple more Aero articles. After reading them, everything kind of clicked. They Explains vehicle aerodynamics and airflow (high pressure/low pressure zones, turbulence, spoiler placement based on rear window slope, etc.) in terms that don't make your eyes gloss over. Also shows a D.I.Y. quasi wind tunnel method called wool-tuft testing that we can all do. A really good read. Post up any ideas, thoughts, or comments.

      Blowing the Vortex
      ------------------
      Part 1: http://www.autospeed.com/A_3058/cms/article.html
      Part 2: http://www.autospeed.com/A_3059/cms/article.html
      Part 3: http://autospeed.com/A_3060/cms/article.html
      Part 4: http://autospeed.com/cms/title_Blowi...1/article.html (very interesting results on placing vortex generators below the front bumper...noticeable high speed stability increase)




      Aero/Wool-Tuft Testing
      ------------------------
      Part 1: http://www.autospeed.com/A_108656/cms/article.html
      Part 2: http://www.autospeed.com/A_108674/cms/article.html
      Part 3: http://www.autospeed.com/A_108675/cms/article.html


      Undertrays, Spoiler, and Bonnet Vents
      -------------------------------------
      Part 1: http://www.autospeed.com/A_2159/cms/article.html
      Part 2: http://www.autospeed.com/A_2160/cms/article.html
      Part 3: http://www.autospeed.com/cms/A_2162/article.html
      Last edited by Ash; 11-04-2009 at 09:35 AM. Reason: Links
      You can't be slick to a can of oil


    2. #2
      Join Date
      Sep 2007
      Location
      Southern California
      Posts
      566
      Country Flag: United States
      Interesting reading, Ash.

      Agrees with somethings I have read and seen others use. The high pressure zone at the base of the windshield is one. This is very useful info for those of us building our own spoilers. I like the yarn test!

      Jon
      Jon U.

      1968 GTO - SC&C Suspension, Forgeline SO3 Wheels
      Build Thread
      1967 911 with a few mods

    3. #3
      Join Date
      Jun 2009
      Location
      Southwest Florida
      Posts
      246
      Real interesting read for us aero novices, I'll be bookmarking this for future reference.


      -- Dan

    4. #4
      Join Date
      Sep 2009
      Posts
      645
      Country Flag: United States
      Interesting!!

    5. #5
      Join Date
      Nov 2008
      Location
      TN
      Posts
      938
      Hey all!
      I recently learned a new trick for aero testing. Mix Powdered paint with oil and just drip it on. Then go for a drive and see what it looks like.. The long streaks are the low pressure zones. Beats taping a million pieces of yarn all over your car!
      Benjamin

      Twin Dusters
      '72 Plymouth Duster "Aero Duster" project
      '72 Plymouth Duster "Daily Duster" project
      https://www.pro-touring.com/showthre...RO-DUSTER-quot

    6. #6
      Join Date
      Mar 2008
      Posts
      952
      i'm gonna get some of those airtabs and start plastering them all over my 97 Cavalier.. they might just be the thing i need to get up to and over the 40mpg mark that i've been chasing for the last 2 years.

    7. #7
      Join Date
      Dec 2009
      Location
      El Dorado Hills
      Posts
      1,645
      Country Flag: United States
      Very cool thread, I have recently been doing some research on aero for my car. I had thrown on a fiberglass hood a ways back and the hood did not have any structure underneath it to support it. I noticed that when I was at about 65 mph the center of the hood would lift. Well that led me to beleive that with the wind coming through the grill with the steel hood was lifting the front of the car up which is something I noticed on the road course at speeds of 130 mph and up. I have been thinking about designing an aero hood and also how to divert air and limiting air coming through the front grill.

      Gaetano Cosentino
      Dont Drive Faster Than Your Angels Can Fly

    8. #8
      Join Date
      Apr 2009
      Posts
      337
      I'm glad you guys dig it as much as I do, and props to AutoSpeed for the articles. It's so funny how some aspects of this hobby come off as unobtainuim fueled voodoo, and when you boil it down, end up requiring the simplest of tools to understand and implement. Yarn, Tape, Magnehelic gauge, and a manometer...I never would have guessed.

      The oil and powdered paint makes a lot of sense, but the nooks and crannies it would get into makes me cringe.

      40 MPG. Thats insane.
      You can't be slick to a can of oil

    9. #9
      Join Date
      May 2010
      Location
      Maryland
      Posts
      108
      For a good read...

      http://www.carstylingmag.com/default...datarq=AERODYN

      A required book for my Aero class in school.

    10. #10
      Join Date
      Nov 2008
      Location
      TN
      Posts
      938
      Quote Originally Posted by Ash View Post
      I'm glad you guys dig it as much as I do, and props to AutoSpeed for the articles. It's so funny how some aspects of this hobby come off as unobtainuim fueled voodoo, and when you boil it down, end up requiring the simplest of tools to understand and implement. Yarn, Tape, Magnehelic gauge, and a manometer...I never would have guessed.

      The oil and powdered paint makes a lot of sense, but the nooks and crannies it would get into makes me cringe.

      40 MPG. Thats insane.

      Pressure washer. Easy

      A lot of things are like that *voodoo* or whatnot and actually somewhat simple on the surface...
      Benjamin

      Twin Dusters
      '72 Plymouth Duster "Aero Duster" project
      '72 Plymouth Duster "Daily Duster" project
      https://www.pro-touring.com/showthre...RO-DUSTER-quot

    11. #11
      Join Date
      Nov 2008
      Location
      TN
      Posts
      938
      Quote Originally Posted by DocJr View Post
      For a good read...

      http://www.carstylingmag.com/default...datarq=AERODYN

      A required book for my Aero class in school.
      Awesome! Just what I need! Another cool book!

      How big is it?
      Benjamin

      Twin Dusters
      '72 Plymouth Duster "Aero Duster" project
      '72 Plymouth Duster "Daily Duster" project
      https://www.pro-touring.com/showthre...RO-DUSTER-quot

    12. #12
      Join Date
      Apr 2009
      Posts
      337
      Quote Originally Posted by Bjkadron View Post
      Awesome! Just what I need! Another cool book!

      How big is it?

      X2. Ordering on Pay Day
      You can't be slick to a can of oil

    13. #13
      Join Date
      May 2010
      Location
      Maryland
      Posts
      108
      Hey guys,

      Dimensions are 10.25x9.75x.5 in thick...168 pages. The whole read isn't as big as what it seems, its also written in japanese, but still, by all means, it's an in depth book, with TONS of pictures, diagrams, charts, etc. I'm pretty sure many car designers have read it.

      I also have Car Styling's clay sculpting edition. I would love to have the actual magazine subscription, but its 150 bucks a year...for 4 publications!!

      Glad I could add to the thread!

    14. #14
      Join Date
      Nov 2008
      Location
      TN
      Posts
      938
      Quote Originally Posted by DocJr View Post
      Hey guys,

      Dimensions are 10.25x9.75x.5 in thick...168 pages. The whole read isn't as big as what it seems, its also written in japanese, but still, by all means, it's an in depth book, with TONS of pictures, diagrams, charts, etc. I'm pretty sure many car designers have read it.

      I also have Car Styling's clay sculpting edition. I would love to have the actual magazine subscription, but its 150 bucks a year...for 4 publications!!

      Glad I could add to the thread!
      Sweet! I'll start saving.
      Benjamin

      Twin Dusters
      '72 Plymouth Duster "Aero Duster" project
      '72 Plymouth Duster "Daily Duster" project
      https://www.pro-touring.com/showthre...RO-DUSTER-quot

    15. #15
      Join Date
      Dec 2009
      Location
      El Dorado Hills
      Posts
      1,645
      Country Flag: United States
      Could be time for an Aerodynamics forum. That would be cool.

      Gaetano Cosentino
      Dont Drive Faster Than Your Angels Can Fly

    16. #16
      Join Date
      Nov 2008
      Location
      TN
      Posts
      938
      Quote Originally Posted by Gitter Dun View Post
      Could be time for an Aerodynamics forum. That would be cool.
      Vote 2!
      Benjamin

      Twin Dusters
      '72 Plymouth Duster "Aero Duster" project
      '72 Plymouth Duster "Daily Duster" project
      https://www.pro-touring.com/showthre...RO-DUSTER-quot

    17. #17
      Join Date
      Aug 2006
      Location
      San Francisco, CA
      Posts
      809
      Country Flag: United States
      Here's what I have planned aerodynamically:

      :

      Closeout panel


      and hood louvers

      :

      Steven

      1968 Camaro: Project "TRACKDAY"

      Latest Track Weekend Video

      Build in Progress

    18. #18
      Join Date
      Nov 2008
      Location
      TN
      Posts
      938
      Quote Originally Posted by sik68 View Post
      Here's what I have planned aerodynamically:

      :

      Closeout panel


      and hood louvers

      :

      What does it close out? the whole front?
      Benjamin

      Twin Dusters
      '72 Plymouth Duster "Aero Duster" project
      '72 Plymouth Duster "Daily Duster" project
      https://www.pro-touring.com/showthre...RO-DUSTER-quot

    19. #19
      Join Date
      Aug 2006
      Location
      San Francisco, CA
      Posts
      809
      Country Flag: United States
      Quote Originally Posted by Bjkadron View Post
      What does it close out? the whole front?
      Check this out:
      http://undercoverinnovations.com/Camaro1Lower.htm
      Steven

      1968 Camaro: Project "TRACKDAY"

      Latest Track Weekend Video

      Build in Progress

    20. #20
      Join Date
      Nov 2008
      Location
      TN
      Posts
      938
      Oh! Ok.. It is just a front undertray. you confused me with the "closeout panel" name.
      Benjamin

      Twin Dusters
      '72 Plymouth Duster "Aero Duster" project
      '72 Plymouth Duster "Daily Duster" project
      https://www.pro-touring.com/showthre...RO-DUSTER-quot

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