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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-17-2009, 06:03 PM   #31 (permalink)
Master EcoModder
 
Join Date: Nov 2008
Location: Madison AL
Posts: 1,123

The Geo - '93 Geo Metro
Team Metro
90 day: 45.16 mpg (US)
Thanks: 30
Thanked 40 Times in 37 Posts
Drive "fast" when you do the test, it will help show the benefits, if any, better.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-17-2009, 06:05 PM   #32 (permalink)
EcoModding Lurker
 
Join Date: Oct 2008
Location: KC
Posts: 62
Thanks: 3
Thanked 2 Times in 2 Posts
What do you guys think will happen ?
B. The drag will actually be worse.

Your interior will now be part of the wake bubble. Air will enter through the tailgate area and get sucked out your front windows at the low pressure area by the A posts. It will also be loud. You'll also enjoy road spray on the inside of your windshield if the road is wet.
  Reply With Quote
Old 11-18-2009, 12:28 PM   #33 (permalink)
Master EcoModder
 
The Atomic Ass's Avatar
 
Join Date: Oct 2008
Location: Mason, OH
Posts: 532

Priinocchio - '17 Toyota Prius Two Eco
90 day: 67.23 mpg (US)
Thanks: 11
Thanked 18 Times in 15 Posts
Quote:
Originally Posted by Cd View Post
Probably 99.7% of the world thinks that cars look 'ugly' or 'odd' with a boat tail. People don't want a big thing sticking out the back side of their SUV. I see this invention as a way of catering to the rest of the world.
It sucks to be part of the 0.3% of the world that thinks an SUV is an ugly contraption.
__________________
  Reply With Quote
Old 11-18-2009, 03:19 PM   #34 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,538

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,056
Thanked 630 Times in 396 Posts
Quote:
Originally Posted by The Atomic Ass View Post
It sucks to be part of the 0.3% of the world that thinks an SUV is an ugly contraption.
Why does it suck? Remember: you're in the top 0.3% !! You should be proud
__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

  Reply With Quote
Old 11-18-2009, 03:24 PM   #35 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,324
Thanks: 2,659
Thanked 922 Times in 550 Posts
Quote:
Originally Posted by aspera View Post
What do you guys think will happen ?
B. The drag will actually be worse.

Your interior will now be part of the wake bubble. Air will enter through the tailgate area and get sucked out your front windows at the low pressure area by the A posts. It will also be loud. You'll also enjoy road spray on the inside of your windshield if the road is wet.
Would the air entering the tailgate have more force than the air trying to escape through it ?

Also, I assumed that the wake was already pretty messy back there, and that the messy air coming out the back would be pretty much the same .

Thanks for your advice.
  Reply With Quote
Old 11-21-2009, 09:46 AM   #36 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,324
Thanks: 2,659
Thanked 922 Times in 550 Posts
If I know from the start that that the results of the testing will be more drag, I won't even waste my time with it.
Will the drag still be worse if I create a smooth channel for the air to run out the back ?
I plan to create a channel running from the passenger side window out to the back of the car. ( I'd remove the passenger seat and fold down the back seats flush.
Since this would be asymmetrical, would this lead to any problems with the test ?

In the real world, this would never be practical on a car like mine, but as I look at cars such as a VW Jetta, it seems that you could create a channel for the air that would be weather tight and would not cause extra wind noise. You could exhaust the air out slots on the back of the trunk.
  Reply With Quote
Old 11-21-2009, 09:51 AM   #37 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,324
Thanks: 2,659
Thanked 922 Times in 550 Posts
Here is a really sloppy example :

  Reply With Quote
Old 11-21-2009, 11:41 AM   #38 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 61 Times in 44 Posts
Quote:
It sucks to be part of the 0.3% of the world that thinks an SUV is an ugly contraption.
most people don't think about these things... if all cars look a certain way they think it looks good especially if comertials cofirm that.

if all carmakers would suddenly bring out boattails or if the next james bond movie would have a production car with a boattail than people would want it (of course a true solid boattail is just very unpractical for most people wich is why cars don't have them)
__________________
aer·o·dy·nam·ics: the science of passing gass

*i can coast for miles and miles and miles*
  Reply With Quote
Old 11-21-2009, 12:24 PM   #39 (permalink)
Grrr :-)
 
Nerys's Avatar
 
Join Date: May 2008
Location: Levittown PA
Posts: 800

Cherokee - '88 Jeep Cherokee
90 day: 19.44 mpg (US)

Ryo-Ohki - '94 Geo Metro Xfi
90 day: 50.15 mpg (US)

Vger 2 - '00 Plymouth Grand Voyager SE

Ninja - '89 Geo Tracker
90 day: 30.27 mpg (US)
Thanks: 12
Thanked 31 Times in 25 Posts
Smoke testing JUST might be doable. I hear (and saw for myself) that seafoam through the throttle body creates an ass ton of smoke. I am thinking seafoam (or other similar) injection maybe directly into the exhaust? in the lead car the subject car follows close in and a chase car alongside off to the side with a video camera.

get the smoke going video tape the results. not perfect but MIGHT garner usable results.

I am thinking kamback and air injection under the kamback to virtually "extend" the kamback.

as for costing more energy than saved this is an oxymoron. entrophy says this is 100% what will happen 100% of the time. Period so even saying it kind of sounds silly.

what matters is NOT energy in versus energy out (which is ALWAYS negative) but DOLLARS in versus dollars out.

even if it takes 3 times the energy you save is the alternative CHEAPER.

ie compressing the air at home uses your household current and as we know this is virtually FREE compared to the cost of gasoline. so unless your using hundreds of kilowatts each drive your never going to spend as many dollars on E as you do on GAS. This is why EV's are so damned desirable.

you run into another problem though. your going to expend you compressed air VERY VERY quickly. as a short TEST with say a scan gauge this might garner results but you only going to be able to carry at best a few minutes of air power with you without going to very very expensive tanks and pumps. ie you need a giant tank at THOUSANDS of PSI not the measily 120-150psi your can do with conventional affordable tech and the 20-40 gallons of air you can carry at that pressure.

you need more along the lines of 50-80 gallons of air at 4000-5000psi to get anything usable. the COMPRESSOR to do that costs more than most of our cars cost and it was not designed for such a duty cycle ie even more expensive.

real time generation is likely going to be whats needed. I am not sure how to do this. it does make the thought juices flow though :-)
  Reply With Quote
Old 11-21-2009, 01:27 PM   #40 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,626
Thanks: 20,291
Thanked 6,282 Times in 3,888 Posts
correction

I found the reference for earlier work:
"Trapped Vortex Flow Control For Automobiles," by J.J.Cornish,III,Chief Engineer,Lockheed Aircraft Corp.,Marrieta,Georgia division.
Presented,Los Angeles,California meeting,Aerospace Industries Association of America( 100 Wilson Blvd.,Suite 1700,Arlington,VA 22209 USA Aerospace Industries Association ).

  Reply With Quote
Reply  Post New Thread


Tags
coanda slots

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Comparing Warm Air Intakes (WAI) & Cold Air Intakes (CAI) toomuch EcoModding Central 23 05-26-2019 05:41 AM
Honda IACV explained TomO Off-Topic Tech 16 12-21-2015 01:49 AM
start to play with IAT sensor on Mercedes E250D-Turbo 98' poisas EcoModding Central 6 10-07-2013 04:13 PM
Compressed Air Car 88CRX Fossil Fuel Free 42 10-08-2010 06:34 AM
Moving air intake into the engine compartment? pasadena_commut Aerodynamics 5 07-25-2008 03:24 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com