06-08-2011, 07:07 AM
|
#1 (permalink)
|
|
EcoModding Lurker
Join Date: May 2011
Location: St. Petersburg, FL
Posts: 44
Thanks: 59
Thanked 1 Time in 1 Post
|
Spoiler at back of a hatchback officially non-useless (SAE paper)
http://inderscience.metapress.com/ap...lts,1:110895,1
A Rear Spoiler of a New Type that Reduces the Aerodynamic Forces on a Mini-Van
Unfortunately, I don't have a subscription to either publisher, but if you read the two abstracts together, it's clear that an advanced vortex generating design at the back of a minivan has added downforce and reduced drag.
It sounds to me like turbolator tape or any of the various marketed VG designs could possibly help the Cd of a hatchback, SUV, or van--but I'd really like to get my hands on the actual spoiler involved here. Anybody have journal access or Hualei Chen and Inchul Kim on speed-dial?
|
|
|
|
|
Today
|
|
|
|
Other popular topics in this forum...
|
|
|
|
|
06-08-2011, 01:19 PM
|
#2 (permalink)
|
|
EcoModding Apprentice
Join Date: Apr 2011
Location: Houston
Posts: 228
Thanks: 0
Thanked 20 Times in 16 Posts
|
|
|
|
|
|
06-08-2011, 01:26 PM
|
#3 (permalink)
|
|
EcoModding Apprentice
Join Date: Apr 2011
Location: Houston
Posts: 228
Thanks: 0
Thanked 20 Times in 16 Posts
|
|
|
|
|
|
The Following User Says Thank You to Bill in Houston For This Useful Post:
|
|
|
06-08-2011, 01:40 PM
|
#4 (permalink)
|
|
60+ mpg at posted speeds
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 1,190
Thanks: 385
Thanked 166 Times in 113 Posts
|
Quote:
Originally Posted by khafra
|
I'll try to inter library loan the articles from my university if nobody has a subscription or reports on the findings.
__________________
Black and Green will be rebuilt over decades as parts die--until it becomes a different car. Goal is only 60-70 mpg at posted speeds. I'm not trying for highest possible mileage.
Calculators: standard deviation, Ohms Law, & drag HP losses.
|
|
|
|
|
The Following User Says Thank You to California98Civic For This Useful Post:
|
|
|
06-08-2011, 02:02 PM
|
#5 (permalink)
|
|
"Inconceivable"
Join Date: Jul 2008
Location: Mancelona, MI
Posts: 252
Thanks: 1
Thanked 55 Times in 33 Posts
|
__________________
moorecomp
Mancelona, MI
|
|
|
|
|
06-08-2011, 02:08 PM
|
#6 (permalink)
|
|
Master EcoModder
Join Date: Jul 2010
Location: Failed State Belgium
Posts: 2,959
Thanks: 87
Thanked 283 Times in 228 Posts
|
Quote:
Originally Posted by Bill in Houston
this MIGHT be a picture of it...
 |
I've seen that before on here, and IIRC it was an intricate spoiler design made to help fill in the wake without creating additional drag in the process. |
|
|
|
|
06-08-2011, 02:18 PM
|
#7 (permalink)
|
|
"Inconceivable"
Join Date: Jul 2008
Location: Mancelona, MI
Posts: 252
Thanks: 1
Thanked 55 Times in 33 Posts
|
And one guy made one and had success with it: Mazda 626 Aero Mods -12% better MPG @75MPH
__________________
moorecomp
Mancelona, MI
|
|
|
|
|
The Following 2 Users Say Thank You to moorecomp For This Useful Post:
|
|
|
06-08-2011, 08:08 PM
|
#8 (permalink)
|
|
60+ mpg at posted speeds
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 1,190
Thanks: 385
Thanked 166 Times in 113 Posts
|
Quote:
Originally Posted by moorecomp
|
That is one impressive diy spoiler build. Among the best projects I have seen for street appeal. Thanks for posting it. This is how I want final products in prominent places on the body exterior to look.
__________________
Black and Green will be rebuilt over decades as parts die--until it becomes a different car. Goal is only 60-70 mpg at posted speeds. I'm not trying for highest possible mileage.
Calculators: standard deviation, Ohms Law, & drag HP losses.
|
|
|
|
|
06-10-2011, 04:51 PM
|
#9 (permalink)
|
|
Master EcoModder
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 3,975
Thanks: 1,179
Thanked 807 Times in 469 Posts
|
$22
Quote:
Originally Posted by khafra
|
You should be able to purchase the Paper from SAE for $22 US,or get it little cheaper downloading it online from their site.It might have images such that you can reconstruct what they did. |
|
|
|
|
06-10-2011, 09:29 PM
|
#10 (permalink)
|
|
Tenderfoot
Join Date: Jan 2010
Location: Bozeman Montana
Posts: 437
Thanks: 127
Thanked 169 Times in 88 Posts
|
OK, Sorry to kill the party here, but there is a huge leap from a very highly designed spoiler for one particular vehicle, to Vortex Generators and Tabulators....
They aren't really on the same planet. So don't go making a case for those VG gimmicks to work based on this paper, it isn't even in the same realm. It isn't even a hatchback. VGs have been shown to have a very small benefit in some very specific cases, anywhere on the back part of a minivan style vehicle is not one of them.
Vortex Generators, still officially useless 99.5% of the time.
|
|
|
|
|
The Following User Says Thank You to ChazInMT For This Useful Post:
|
|
|
