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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-20-2017, 09:21 AM   #11 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 19,681

Blackfly - '98 Geo Metro
Team Metro
90 day: 70.72 mpg (US)

ForkenSwift - '92 Geo Metro EV
Last 3: 95.68 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 47.99 mpg (US)
Thanks: 2,144
Thanked 4,917 Times in 2,472 Posts
Quote:
Originally Posted by oldtamiyaphile View Post
Well, I have all I need to do it
It would be fun to see some numbers.

__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



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
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-20-2017, 02:11 PM   #12 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 5,698
Thanks: 0
Thanked 544 Times in 488 Posts
Removing the windshield and the rear window doesn't sound like a good idea at all. Depending on the roof curvature at its end, air getting directed downward and trapped there might actually increase the drag in a way similar to the tailgate of a truck.
  Reply With Quote
The Following User Says Thank You to cRiPpLe_rOoStEr For This Useful Post:
aerohead (07-22-2017)
Old 07-22-2017, 02:34 PM   #13 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 8,378
Thanks: 10,314
Thanked 4,406 Times in 2,447 Posts
on or off

Quote:
Originally Posted by EcoCivic View Post
I would not, but I heard that you can reduce frontal area and therefore your Cd by removing the windshield and back window so the air can easily flow through the car instead of getting shoved off to the side by the windshield. Does that make sense to you? It does not to me. Thanks
So far,no one has actually tested it and published the results.The closest thing would be a comparison of racing coupes,roadsters,and spyders.
*a sports car Coupe of Cd 0.50
*as a roadster might be Cd 0.75
*and as a spyder,Cd 0.42,with half bubble and head fairing
* and cleaned up with detail optimization,Cd 0.31,as I've seen at Darko.
I agree with CrippledRooster that the presence of a roof without glazings could be an aerodynamic torture chamber,because of pillars and roof camber and all the interference drag.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following User Says Thank You to aerohead For This Useful Post:
freebeard (07-22-2017)
Old 07-22-2017, 05:56 PM   #14 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 9,029
Thanks: 1,958
Thanked 2,939 Times in 2,297 Posts
The one place I can see an advantage is in off-road racing where you are traveling in a cloud of dust and rocks.

But it's a safety advantage, not aerodynamic.
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (07-29-2017)
Old 07-23-2017, 11:21 AM   #15 (permalink)
The road not so traveled
 
TheEnemy's Avatar
 
Join Date: Jan 2010
Location: New Mexico
Posts: 654

The Truck - '99 Nissan Frontier xe
90 day: 25.74 mpg (US)

The Ugly Duck - '84 Jeep CJ7 Rock crawler
Thanks: 18
Thanked 43 Times in 39 Posts
Quote:
Originally Posted by MetroMPG View Post
When I saw the thread title, I thought this was going to be about Jeeps with the fold-able windshields.

I wonder if anybody who owns one cares enough about MPG to have tested the difference.
Approximately 2 mpg...

As far as legality the driver is required to wear eye protection.
  Reply With Quote
The Following 2 Users Say Thank You to TheEnemy For This Useful Post:
aerohead (07-29-2017), freebeard (07-23-2017)
Old 07-25-2017, 01:43 AM   #16 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 5,698
Thanks: 0
Thanked 544 Times in 488 Posts
Quote:
Originally Posted by freebeard View Post
The one place I can see an advantage is in off-road racing where you are traveling in a cloud of dust and rocks.

But it's a safety advantage, not aerodynamic.
IIRC some heavy off-roaders replace the windshield with a metal screen exactly in order to avoid not just the debris from the route, but also due to the shrapnels that one could release if broken.
  Reply With Quote
The Following User Says Thank You to cRiPpLe_rOoStEr For This Useful Post:
aerohead (07-29-2017)
Old 07-29-2017, 01:24 PM   #17 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 8,378
Thanks: 10,314
Thanked 4,406 Times in 2,447 Posts
Lotus Seven

Quote:
Originally Posted by JockoT View Post
When you think about it, the aero screen and tonneau cover of the 20's and 30's was spot on. Here is a more recent rendition.
I think that it was CAR and DRIVER that did a road test of the Caterham 7,Lotus 7 homage car.With the roof on it was reported at Cd 0.62.They didn't give a number for the roof down.
Walter Korff reported Cd 0.75 for 1960s era sports roadsters.Ouch!
Small frontal area,light,and great power-to-weight ratio though.

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com