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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-31-2012, 06:35 PM   #11 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,302
Thanks: 2,615
Thanked 906 Times in 542 Posts
Hey Euro, I like your thinking !
Clever idea using a bike rack disguise !

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-31-2012, 06:44 PM   #12 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,099

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,310
Thanked 2,034 Times in 1,384 Posts
Quote:
Originally Posted by Cd View Post
Hey Euro, I like your thinking !
Clever idea using a bike rack disguise !
Me too.

Quote:
Originally Posted by Cd View Post
( Actually, to be fair it should be mentioned that Paulu made note of the studies posted here on page 2 of the original thread - but its good to have a dedicated thread on this. )
I did note it, and linked to his post, in the OP of this thread. I was unaware of his post at first. When I saw it, I edited this post and also asked the moderators to consider merging the threads, but Metro thought there was enough difference to keep them separate. My OP was mostly interested in expanded detail on the specific drag reductions attained through the box cavity designs. That was not part of what paulu noted.
__________________
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



  Reply With Quote
The Following User Says Thank You to California98Civic For This Useful Post:
Cd (03-31-2012)
Old 04-24-2012, 11:55 AM   #13 (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 665 Times in 408 Posts
I've been thinking about this some more. Do you think a sedan owner could create a plexiglass baseplate sticking up vertically from the trunk edge, essentially creating a phantom Kammback? This would be less intrusive than making the trunk unusable but would it give meaningful drag reduction?
__________________
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 03-19-2013, 10:59 AM   #14 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,316

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: 607
Thanked 424 Times in 277 Posts
Quote:
Originally Posted by drmiller100 View Post
Research

This article is IMPORTANT. I recommend you save it, read it, and learn it.

This article is saying you can reduce drag 40 percent by making a tail. And the tail does not have to be very long.

And according to them, 20 degrees is about the absolute max, and even at that you are going to have problems with the bottom, but it is still worth it.

This article is worth SAVING.
Link is broken. Anyone have a copy?
__________________



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:
Flying_Pie (03-19-2013)
Old 03-19-2013, 12:12 PM   #15 (permalink)
Master EcoModder
 
christofoo's Avatar
 
Join Date: Mar 2012
Location: Salt Lake City
Posts: 292

00C - '00 Toyota Corolla
90 day: 43.54 mpg (US)
Thanks: 147
Thanked 188 Times in 72 Posts
Quote:
Originally Posted by PaleMelanesian View Post
Link is broken. Anyone have a copy?
Looks like Coventry broke all the links, and I'm not sure how to find any papers anywhere on their site - which is sad, I haven't read them.

It looks like I had some luck searching the web for a few titles though:
http://www2.warwick.ac.uk/fac/sci/wm...baseplates.pdf
http://www2.warwick.ac.uk/fac/sci/wm...simplebody.pdf
  Reply With Quote
The Following User Says Thank You to christofoo For This Useful Post:
BamZipPow (03-19-2013)
Old 03-19-2013, 07:36 PM   #16 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 3,804
Thanks: 46
Thanked 2,528 Times in 1,769 Posts
Here is one specific to drag on electric vehicles, also covers wheel openings (and more):

http://www2.warwick.ac.uk/fac/sci/wm...tationws12.pdf
__________________
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
  Reply With Quote
The Following 3 Users Say Thank You to kach22i For This Useful Post:
BamZipPow (03-19-2013), California98Civic (03-19-2013), Flying_Pie (03-20-2013)
Old 03-19-2013, 09:45 PM   #17 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,099

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,310
Thanked 2,034 Times in 1,384 Posts
Quote:
Originally Posted by kach22i View Post
Here is one specific to drag on electric vehicles, also covers wheel openings (and more):

http://www2.warwick.ac.uk/fac/sci/wm...tationws12.pdf
On page 10 their scale model testing shows a tiny benefit for "blanking" the wiper cavity. And their biggest benefit was with the rear diffuser.
__________________
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



  Reply With Quote
The Following User Says Thank You to California98Civic For This Useful Post:
Flying_Pie (03-20-2013)
Old 04-04-2013, 01:12 PM   #18 (permalink)
Master EcoModder
 
christofoo's Avatar
 
Join Date: Mar 2012
Location: Salt Lake City
Posts: 292

00C - '00 Toyota Corolla
90 day: 43.54 mpg (US)
Thanks: 147
Thanked 188 Times in 72 Posts
Quote:
Originally Posted by kach22i View Post
Here is one specific to drag on electric vehicles, also covers wheel openings (and more):

http://www2.warwick.ac.uk/fac/sci/wm...tationws12.pdf
Another point I notice in this doc is they used OpenFOAM for CFD - never heard of it, but found it here: The OpenFOAM&#174 Foundation. (I also could have found it just googling 'open source CFD,' though it's nice to know what Universities have chosen for CFD.) OpenFOAM is open source / free, looks easy (for me) to install or build for Linux *not for Windows*... but the learning curve appears very steep. Momentarily I couldn't find an answer to how you import solid objects into the OpenFOAM mesh generator, i.e. from a NURBS or Polygon file format, which is key. But I think I remember some separate open-source projects that stand alone as mesh generators, so I think there is a solution outside the scope of OpenFOAM. (Finally in order to delve into CFD one would have to consider how to setup some correlation between CFD and wind-tunnel data (preferably someone else's published wind-tunnel data), to ensure the computation is configured sensibly. Overall I'm not sure if it's worth the investment of (my) time, but it's always a temptation in the back of my mind... and now I know the name of a viable CFD suite...)
  Reply With Quote
Old 04-04-2013, 01:34 PM   #19 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,667

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 643 Times in 510 Posts
Quote:
Originally Posted by PaleMelanesian View Post
Link is broken. Anyone have a copy?
You'll find them here, amongst other stuff:

https://www.dropbox.com/sh/52o49bkru...modder_studies

Last edited by euromodder; 04-04-2013 at 04:06 PM.. Reason: Modified the link as it didn't work
  Reply With Quote
The Following 5 Users Say Thank You to euromodder For This Useful Post:
3-Wheeler (04-05-2013), California98Civic (04-05-2013), freebeard (04-05-2013), PaleMelanesian (04-05-2013), Swordsman (04-05-2013)
Old 04-05-2013, 10:50 AM   #20 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,316

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: 607
Thanked 424 Times in 277 Posts
Outstanding! Too bad I can only give you one Thanks for that post.



__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Reply  Post New Thread


Thread Tools




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