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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-23-2007, 11:22 PM   #21 (permalink)
Lurking footless halls
 
Silveredwings's Avatar
 
Join Date: Dec 2007
Location: northeast
Posts: 249

Dark Horse - '16 Ford Mustang GT convertible Premium

Gutless Beauty - '19 Toyota Corolla SE
Thanks: 3
Thanked 3 Times in 3 Posts
Amerikans have been culturally conditioned to see "image" as all important. At the risk of quoting Mick Jagger, I just find that so unsatisfying.

And then there's the comments about the cost of the mods vs. the savings in gas: 1) at 440K, I bet the car has returned a pretty good value already; and 2) who says it's all about short-term savings?

Every time I hear about another life lost in the oil war, I feel guilty for my contribution by driving at all.

__________________
Any sufficiently advanced technology is indistinguishable from magic. - Clarke's Third Law
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 12-23-2007, 11:44 PM   #22 (permalink)
Giant Moving Eco-Wall
 
DifferentPointofView's Avatar
 
Join Date: Dec 2007
Location: The Dale, IL (or A-Dale)
Posts: 1,120

The Jeep! - '95 Jeep Grand Cherokee ZJ Laredo
90 day: 23.75 mpg (US)

The Caliber - '07 Dodge Caliber R/T
90 day: 30.6 mpg (US)

The 'Scort - '98 Ford Escort LX
Thanks: 0
Thanked 7 Times in 6 Posts
America is so retarded sometimes. We're probably gonna be the reason for the end of the world. Especially this new upcoming election with Hillary Clinton... buh. We're so gonna be a wreck soon.
__________________


Yea.. I drive a Jeep and I'm on a fuel economy site, but you just wouldn't understand... "It's a Jeep thing!" *Jeep Wave*

Did I Use Too Many Abbreviations? Here's The Abbreviations List
  Reply With Quote
Old 12-24-2007, 01:03 AM   #23 (permalink)
EcoModding Apprentice
 
Join Date: Dec 2007
Location: Melbourne
Posts: 152

The Mighty Mira - '92 Daihatsu Mira
90 day: 61.32 mpg (US)
Thanks: 0
Thanked 7 Times in 7 Posts
Quote:
Originally Posted by DifferentPointofView View Post
well, I was just thinking of the lift problem because the whole car is shaped like an airplane wing, and since there is more down force towards the rear of the vehicle...
If anything happens, that is the most likely of anything. But in most vehicles, there is downforce generated at the front of the vehicle (because the majority of air is pushed up especially with basjoos' car, and that generates an equal but opposite force on the front of the car downward. Because of that, it would be unlikely to tip over that way IMO. It might get equal, but there is also the weight of the car (remember that the rear wheel would be the pivot point, and most of the mass of the car is right at the front end, exerting larger torque).

Most cars generate lift at the back, because there is a low pressure area from the rear window backwards, and that rear window is pointed primarily in an upwards direction, so that component of force (Force = Pressure * Area) is large. I thought this was what you were getting at, but evidently not.

Quote:
Most every car creates lift because of it's similar shape to an airplane wing, uneven raised surface on top, flat surface on bottom. The air going over the top has to go a lot faster than over the bottom so that the air meets up at the back at the same time as the bottom. This creates a high speed, low pressure on top and a low speed, high pressure on bottom, creating lift.
Third grade (and often, unfortunately, higher) level science textbooks have a lot to answer for in their attempts to teach aerodynamics by their mangled interpretation of Bernoulli.

There is no miraculous force that tells one molecule next to another molecule that it must somehow meet up at the other side of a vehicle at exactly the same time. None. To carry that meme to its logical conclusion, consider an inverted "T" shape - pretty much the ideal wing, because of all that distance and hence speed the air must travel around the top to reach the other side at the same time. Well no.

Please note that my ridicule is not aimed at you, it is aimed at ignorant publishers, science writers and teachers that credulously parrot these explanations. To help understand aero, spend a few hours googling "Newton" "Bernoulli", and aerodynamics in general.
__________________
"Every body perseveres in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed." - Isaac Newton

Last edited by newtonsfirstlaw; 12-24-2007 at 01:06 AM..
  Reply With Quote
Old 12-24-2007, 11:37 PM   #24 (permalink)
MechE
 
Join Date: Dec 2007
Location: Bay Area
Posts: 1,151

The Miata - '01 Mazda MX-5 Miata
Thanks: 0
Thanked 22 Times in 18 Posts
^^ Both cases of lift and down force aren't really of any significance Basjoos has already given a thumb up for high speed stability

Quote:
There is no miraculous force that tells one molecule next to another molecule that it must somehow meet up at the other side of a vehicle at exactly the same time. None.
That detail really pisses me off.... Especially when that's taught in flight schools - to greater than third graders.
__________________
Cars have not created a new problem. They merely made more urgent the necessity to solve existing ones.
  Reply With Quote
Old 12-25-2007, 05:30 PM   #25 (permalink)
Master EcoModder
 
metroschultz's Avatar
 
Join Date: Dec 2007
Location: Norfolk, Va. USA
Posts: 869

CPT SLO - '93 GEO Metro plainjane
90 day: 53.91 mpg (US)

SilverHairBeauty - '01 Toyota Avalon XL
90 day: 24.06 mpg (US)
Thanks: 14
Thanked 33 Times in 28 Posts
Send a message via AIM to metroschultz
I really like the look of the aeromods basjoos has made, maybe you guys have covered this already, but, I've looked and not found it. Are their any pics of the mods before, during, and after that might give a newbee some helpful ideas? Thanx.
__________________


When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.
Albert Einstein
  Reply With Quote
Old 12-25-2007, 06:50 PM   #26 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,088

Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 55.14 mpg (US)

Camryglide - '20 Toyota Camry hybrid LE
90 day: 65.83 mpg (US)
Thanks: 16
Thanked 677 Times in 302 Posts
Pictures of my car at different stages of the modification process and photos of various cars and aircraft that provided models and ideas are at the site below.

http://smg.photobucket.com/albums/v4...Honda%20Civic/
__________________
aerocivic.com
  Reply With Quote
Old 12-27-2007, 09:01 PM   #27 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,530

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 54.46 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car Mirage - '14 Mitsubishi Mirage ES (base)
90 day: 62.14 mpg (US)
Thanks: 4,078
Thanked 6,978 Times in 3,613 Posts
AutoblogGreen picked up the Aerocivic thread today:

Aerocivic's mods combine great aerodynamics and a, um, stunning look in 95 mpg Civic

Besides one guy who apparently hasn't heard of coast-down testing and disputes the calculated Cd, this positive comment:
  • With that kind of MPG, who cares what the drag is?

    Someday, all cars will look like this. Well, maybe not _exactly_ like this, but similar
__________________
Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 12-27-2007, 11:02 PM   #28 (permalink)
MechE
 
Join Date: Dec 2007
Location: Bay Area
Posts: 1,151

The Miata - '01 Mazda MX-5 Miata
Thanks: 0
Thanked 22 Times in 18 Posts
^^ Classic case of falling on ones sword - taking care not to miss the point. Some people just need to cling onto insignificant points - insignificant to the grand scheme of things :/ Makes their bitter morning coffee more palatable...
__________________
Cars have not created a new problem. They merely made more urgent the necessity to solve existing ones.
  Reply With Quote
Old 12-27-2007, 11:17 PM   #29 (permalink)
Master EcoModder
 
roflwaffle's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 1,490

Camryaro - '92 Toyota Camry LE V6
90 day: 31.12 mpg (US)

Red - '00 Honda Insight

Prius - '05 Toyota Prius

3 - '18 Tesla Model 3
90 day: 152.47 mpg (US)
Thanks: 349
Thanked 122 Times in 80 Posts
Quote:
Originally Posted by Matt
he could have just done some weight reduction and got similar results.
Why use physniks when ya can use good ol'merican injunuity.
  Reply With Quote
Old 12-27-2007, 11:36 PM   #30 (permalink)
MechE
 
Join Date: Dec 2007
Location: Bay Area
Posts: 1,151

The Miata - '01 Mazda MX-5 Miata
Thanks: 0
Thanked 22 Times in 18 Posts
Quote:
Originally Posted by roflwaffle View Post
Why use physniks when ya can use good ol'merican injunuity.

'cause even fiziks is on his side Less weight is only beneficial (FE wise) during positive accelerating (including while going up hill). The rest of the time, aero takes over as the primary factor I'm not saying it's not important - but weight reduction only does so much (really great when you have a lot of extra crap)

__________________
Cars have not created a new problem. They merely made more urgent the necessity to solve existing ones.
  Reply With Quote
Reply  Post New Thread






Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com