Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-11-2015, 04:15 AM   #91 (permalink)
Not Doug
 
Xist's Avatar
 
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 9,034

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 35.35 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 35.24 mpg (US)
Thanks: 6,109
Thanked 1,726 Times in 1,303 Posts
I am curious what they consider to be aerodynamic wheels.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-11-2015, 04:21 AM   #92 (permalink)
EcoModding Apprentice
 
Join Date: Aug 2014
Location: Adelaide, Australia
Posts: 118

Emerald - '97 Honda Civic CXi
90 day: 40.13 mpg (US)
Thanks: 53
Thanked 53 Times in 32 Posts
Quote:
Originally Posted by freebeard View Post
I found this thread through Google Images!
I think this should be high-velocity. Otherwise a good summation of the concept, a variation on the Coanda nozzle.
I believe it's a bit of both... high pressure at the inlet where air is piling up at the edge of the air dam, which narrows to produce high velocity. I got a close look at a parked BMW a while back and while the intake looked to be about 3cm by 10cm as per the text, the outlet looked to be in the region of 1-1.5cm wide (as they say, "discharged through a very narrow opening at high speed"), so it narrows down quite a bit. High pressure at the intake, high velocity at the outlet.

On a side note, seeing it in the flesh I was surprised how little of the front edge of the tyre it 'covered', despite knowing that only the middle section of the tyre had the air curtain - the tyres in question were 225/45 R18, so about 66cm high.
  Reply With Quote
Old 01-05-2016, 02:19 PM   #93 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 15,339
Thanks: 3,897
Thanked 5,100 Times in 4,061 Posts

http://www.carmagazine.co.uk/spy-shots/mercedes-benz/mercedes-signs-off-four-electric-tesla-fighters/


The M-B design would translate well onto a Superbeetle front fascia. I've got a 'towelrack' bumper over-rider from the older style bumper that I want to hang upside down under the [higher] newer style front bumper. I don't want to drill mounting holes in the brand new bumper, so I'm still trying to figure that out. But it will have the center open section and plates clipped to the fender edge. It would also be a foundation for a front partial belly pan.
  Reply With Quote
Old 01-05-2016, 03:38 PM   #94 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 10,876
Thanks: 17,194
Thanked 5,818 Times in 3,508 Posts
.01

Quote:
Originally Posted by curv872 View Post
Stated in post #7, a reduction cd of .01
Is that 0.01%,or Delta-Cd -0.01 ? I'm confused from #7 (permalink)
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 01-05-2016, 04:11 PM   #95 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 10,876
Thanks: 17,194
Thanked 5,818 Times in 3,508 Posts
X5-3rd-gen drag

Quote:
Originally Posted by freebeard View Post
I found this thread through Google Images!



I think this should be high-velocity. Otherwise a good summation of the concept, a variation on the Coanda nozzle.

kach22i -- Your link gets 403:Forbidden. I think I found it at Access forbidden!

To move things along, here's an interesting article that ties BMW's research to a museum about the Graf Zepplin:
BMW EfficientDynamics


*The 3rd-gen X5 is reported at Cd 0.31
*The graphic shows that the wheelhouses and wheels are responsible for 30% of the total aerodynamic drag.
*That would be 0.093.
*Leaving 0.217 for the body in ground proximity.
*This is the most valuable info. I've seen in years!
-----------------------------------------------------------------------
*When Morelli added wheelhouses and wheels to the CNR 'banana' car,the Cd leaped,from Cd 0.161,to Cd 0.35,a 0.189 increase,217%.
*A.Cogotti (of Pininfarina's wind tunnel) saw a drag increase,from Cd 0.073,to Cd 0.157 when he added wheelhouses and wheels to his experimental body.A 215% drag increase.
The wheelhouses alone raised drag by 163%.

--------------------------------------------------------------------------
*The lower the drag of the basic body itself,the more important the wheel drag becomes

just like Hucho publishes.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following 2 Users Say Thank You to aerohead For This Useful Post:
BamZipPow (01-06-2016), Vman455 (01-05-2016)
Old 01-05-2016, 05:55 PM   #96 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 15,339
Thanks: 3,897
Thanked 5,100 Times in 4,061 Posts
Quote:
*This is the most valuable info. I've seen in years!
And it's only Tuesday!

Posted by kach22i in the Interesting Cars thread:



Apparently they recognize the problem but I don't see how anyone could expect that to perform in real life.
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (01-06-2016)
Old 01-06-2016, 10:54 AM   #97 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 659 Times in 474 Posts
Quote:
Originally Posted by euromodder View Post
Not every side-mounted airscoop develops into an air curtain.
THIS!
"Back in the day", front ducts were for cooling the brakes.
__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Old 01-06-2016, 05:46 PM   #98 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 10,876
Thanks: 17,194
Thanked 5,818 Times in 3,508 Posts
perform

Quote:
Originally Posted by freebeard View Post
And it's only Tuesday!

Posted by kach22i in the Interesting Cars thread:



Apparently they recognize the problem but I don't see how anyone could expect that to perform in real life.
It reminds me of what I think was an Audi concept in 'Minority Report'.
I don't know how you could survive a bump or pothole,or turn the wheels.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 01-06-2016, 06:21 PM   #99 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 15,339
Thanks: 3,897
Thanked 5,100 Times in 4,061 Posts
There's one thing I can see working. Each pontoon fender has a part line with the flamboyant rocker panel. If it consisted of a cycle fender and a rigid mount with a pliable but rigid fill panel some limited wheel travel/steering could be absorbed by the fender.

Ross Lovegrove would be the guy to design it.

http://www.dezeen.com/2015/04/14/ross-lovegrove-design-schools-way-behind-need-embrace-digital-milan-2015/

I was looking for a picture of the underside on a chair seat that he did, this will have to do.
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (01-09-2016)
Old 02-24-2016, 07:37 PM   #100 (permalink)
Master EcoModder
 
Join Date: May 2010
Location: Illinois
Posts: 428

Oh Deer - '03 Ford Ranger XL
90 day: 33.16 mpg (US)
Thanks: 51
Thanked 69 Times in 54 Posts
Not that I would even know how to implement something like this, but I do like to learn as much as I can. After reading the last 10 pages it seems like these air curtains work by moving air from the higher pressure area in from of the vehicle (bumper area) through slots, and increasing it's velocity by narrowing the slots into slits before expelling the air across the face of the front wheels. This in turn either helps fill the cavity of the front wheel well causing a "boundary" so that the air moving around the vehicle doesn't get "scrambled" causing drag? Or the air coming through the slits is of a greater velocity (pressure?) than the air moving around the corner (bumper) creating this "curtain", again keeping the attached air from getting "scrambled"?

I am assuming these slits have their opening in the wheel well somewhere near the vertical mid-line of the tire or are they closer to the outer edge of the tire?

I know the "particulars" of this are way above my head, but man I do love to learn.

__________________



  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com