Vortex Generators / Hmmm Airtabs - Page 4 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 07-26-2006, 06:58 AM   #31
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Quote:
Originally Posted by ZugyNA
>> Could you upload a copy of that report? <<
I will if the airtab guy says it's OK. Waiting to hear back.

Quote:
maybe with some vgs...direction isn't that important
That seems to be the case, doesn't it.

Quote:
the airtab clones are made so that the air is focused and made into a non vortex type higher pressure stream...while maybe there is a low pressure area between them.
Could you show me a pic of this non-vortex type? This is the first I've heard of that behaviour. My understanding is that the airtab style also creates vortices.
__________________

MetroMPG is offline   Reply With Quote
Old 07-26-2006, 08:59 AM   #32
Registered Member
 
JanGeo's Avatar
 
Join Date: Jan 2006
Posts: 2,442
Country: United States
Send a message via Yahoo to JanGeo
The Airtabs have a definate direction to face and create a clockwise vortex and counter clockwise vortex and should be placed 4 inches apart. The idea is to prevent reverse air flow back against the rear of the vehicle which represents drag and turbulance. I wish the improvement was greater to justify the cost but I guess at some point I will get a few and try them.
__________________

JanGeo is offline   Reply With Quote
Old 07-26-2006, 01:42 PM   #33
Registered Member
 
Join Date: Jul 2006
Posts: 24
Country: United States
Vortex Strakes

Here's an SAE paper that describes how "vortex strakes" can be used to create an "aerodynamic boattail" behind semitrailers. See p. 13 for pics.

http://www.solusinc.com/pdf/2003-01-3377.pdf

Blue skies,

Patrick
vegasjetskier is offline   Reply With Quote
Old 07-26-2006, 05:27 PM   #34
Registered Member
 
ZugyNA's Avatar
 
Join Date: May 2006
Posts: 587
Country: United States
Quote:
Originally Posted by MetroMPG
Could you show me a pic of this non-vortex type? This is the first I've heard of that behaviour. My understanding is that the airtab style also creates vortices.
a pic and the pattern for the airtab clones is here:

http://www.gassavers.org/showthread.php?t=1351

I don't think the airtab type create vortexes...since the vanes oppose one another....


the vgs I used on the roof are a different pattern....and do create vortexes.
Attached Images
 
__________________
Leading the perpetually ignorant and uninformed into the light of scientific knowledge. Did I really say that?

a new policy....I intend to ignore the nescient...a waste of time and energy.
ZugyNA is offline   Reply With Quote
Old 07-26-2006, 06:14 PM   #35
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
According to the airtabs website (in "How do they work"), they create vortices.
MetroMPG is offline   Reply With Quote
Old 07-26-2006, 07:27 PM   #36
Registered Member
 
Join Date: Nov 2005
Posts: 331
Country: United States
Send a message via MSN to n0rt0npr0
Quote:
Originally Posted by MetroMPG
According to the airtabs website (in "How do they work"), they create vortices.
Yes. Metro, I've been running my airtabs for sometime now, and when I drive through the rain, and a vehicle is behind me with thier lights on...I can significantly see the votices. Also, whenever I cruise down a dirt road above 40mph I can see them.
__________________
"You have to know the truth, and seek the truth, and the truth will set you free."
-unknown
n0rt0npr0 is offline   Reply With Quote
Old 07-27-2006, 04:24 AM   #37
Registered Member
 
ZugyNA's Avatar
 
Join Date: May 2006
Posts: 587
Country: United States
All I can say is that they are symetrical, but the air hitting between the vanes is bumped up...might create a spin? Maybe there is an interaction between this higher pressure and the lower pressure air between the airtabs?

the typical vg obviously creates a spin.....
__________________
Leading the perpetually ignorant and uninformed into the light of scientific knowledge. Did I really say that?

a new policy....I intend to ignore the nescient...a waste of time and energy.
ZugyNA is offline   Reply With Quote
Old 07-27-2006, 06:53 AM   #38
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
FYI: Porsche 914 club forum - racer claims use of airtabs cut 1/2 second off his lap times by reducing rear lift:

http://www.914club.com/bbs2/index.php?s=&showtopic=52170
MetroMPG is offline   Reply With Quote
Old 07-29-2006, 08:37 AM   #39
Registered Member
 
ZugyNA's Avatar
 
Join Date: May 2006
Posts: 587
Country: United States
vgs for Vettes:

http://www.greenwoodcorvettes.net/gc4/vortex.htm

http://www.greenwoodcorvettes.net/gc...structions.htm
__________________
Leading the perpetually ignorant and uninformed into the light of scientific knowledge. Did I really say that?

a new policy....I intend to ignore the nescient...a waste of time and energy.
ZugyNA is offline   Reply With Quote
Old 08-08-2006, 08:12 PM   #40
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Info given to me by Ron Davidson at Airtabs. (Posted with permission)
__________________

MetroMPG is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Aerodynamic auto designs, past and present, and their possible implications The Toecutter Automotive News, Articles and Products 12 02-10-2007 01:04 AM
Fuel economy links kickflipjr General Fuel Topics 0 11-27-2005 12:00 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 12:29 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.