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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-10-2011, 09:36 PM   #1 (permalink)
EcoModding Apprentice
 
Join Date: Nov 2011
Posts: 116
Thanks: 0
Thanked 7 Times in 7 Posts
Front bumper shape

Time has come to redo my front bumper. Which is better for aerodynamics, a wedge shape or a rounded over shape?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-10-2011, 10:04 PM   #2 (permalink)
Master EcoModder
 
Patrick's Avatar
 
Join Date: Apr 2008
Location: Northern Florida, USA
Posts: 510

Hot Tamale - '10 Toyota Prius III
Thanks: 27
Thanked 96 Times in 70 Posts
Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - aerohead's Album: Book illustrations - Picture
  Reply With Quote
The Following 3 Users Say Thank You to Patrick For This Useful Post:
jime57 (11-11-2011), landsailor (11-17-2011), skyking (11-11-2011)
Old 11-11-2011, 10:05 AM   #3 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 4,158
Thanks: 120
Thanked 2,790 Times in 1,959 Posts
I'm glad I noticed the "NEXT" button in that link, some interesting stuff.

Sort of on-topic adjacent, check out this rounded sail boat bow.

Radical new mini - Boat Design Forums

EDIT: I like these book scans, nice info.
http://ecomodder.com/forum/member-ae...strations.html
__________________
George
Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft

Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html

Last edited by kach22i; 11-11-2011 at 10:11 AM..
  Reply With Quote
Old 11-11-2011, 10:41 AM   #4 (permalink)
Master EcoModder
 
Join Date: Oct 2008
Location: Mid-Atlantic
Posts: 491

OurInsight - '06 Honda Insight
Thanks: 170
Thanked 69 Times in 44 Posts
How can I navigate to this section of the site? Obviously, from the link notation, it is some ref material that Phil put onto the site, but I don't see a way to navigate to the material.
  Reply With Quote
Old 11-11-2011, 10:50 AM   #5 (permalink)
Master EcoModder
 
Sven7's Avatar
 
Join Date: Aug 2011
Location: Warren, MI
Posts: 2,456

Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
Thanks: 782
Thanked 667 Times in 409 Posts
Quote:
Originally Posted by jimepting View Post
How can I navigate to this section of the site? Obviously, from the link notation, it is some ref material that Phil put onto the site, but I don't see a way to navigate to the material.
Do you mean the links don't work for you or what?
__________________
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
  Reply With Quote
Old 11-11-2011, 10:51 AM   #6 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,321

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 611
Thanked 433 Times in 283 Posts
Go here to start.
Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - aerohead's Albums
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
The Following User Says Thank You to PaleMelanesian For This Useful Post:
jime57 (11-11-2011)
Old 11-11-2011, 10:54 AM   #7 (permalink)
Master EcoModder
 
Sven7's Avatar
 
Join Date: Aug 2011
Location: Warren, MI
Posts: 2,456

Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
Thanks: 782
Thanked 667 Times in 409 Posts






Looks like it's a balancing act between drag reduction (top) and downforce (bottom). With a street car downforce shouldn't be a problem.
__________________
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
  Reply With Quote
Old 11-11-2011, 11:21 AM   #8 (permalink)
Aero Deshi
 
ChazInMT's Avatar
 
Join Date: Jan 2010
Location: Vero Beach, FL
Posts: 1,065

MagMetalCivic - '04 Honda Civic Sedan EX
Last 3: 34.25 mpg (US)
Thanks: 430
Thanked 668 Times in 357 Posts
If you want inspiration for a front end, look at modern current model cars. They seem to be an air dam type thing low, below midheight. The air dam tends to remain flatter out to the sides so it "pushes" the air out away from the messiness that is the front wheels. Above midpoint, it is all rounded radius to start the air on its trip over the top.

Like This.



or This



I wonder what the CD penalty is for the hood ornament???
  Reply With Quote
Old 11-12-2011, 07:43 PM   #9 (permalink)
EcoModding Apprentice
 
Join Date: Nov 2011
Posts: 116
Thanks: 0
Thanked 7 Times in 7 Posts
That is a lot of help. Thanks. I have been looking at cars coming out now though, and what is with the flat front look. It just appears that having a tall flat bumper would actually cause a negative effect. Does anyone have data on how this effects aerodynamics?
  Reply With Quote
Old 11-13-2011, 05:22 AM   #10 (permalink)
Master EcoModder
 
Join Date: Jan 2009
Location: Maui, Hawaii
Posts: 813
Thanks: 5
Thanked 34 Times in 26 Posts
The alternative is a sloping bumper and front end, which doesn't look as good. Bulldog noses are in fashion.

A bullet shape funnels air under the car which creates front end lift.

  Reply With Quote
Reply  Post New Thread


Thread Tools




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