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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-09-2008, 10:27 AM   #1 (permalink)
OCD Master EcoModder
 
brucepick's Avatar
 
Join Date: Dec 2007
Location: Eastern CT, USA
Posts: 1,936

Outasight - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.18 mpg (US)
Thanks: 431
Thanked 396 Times in 264 Posts
Volvo 240 wagon - partial Kammback prototype

I'm interested in diesel_john's rear aero treatment.


The more I look at the full size pic the better I like this back.
http://ecomodder.com/forum/attachmen...6&d=1202433430
I know how hard it can be to do a back when the liftgate / body cut is on the rear panel and not on the side.

Can you please start a new thread with some details on this one? Or if the thread exists and I missed it - post the link?

Here's a pic of what I had for a couple months this past summer. I tore it off when I wanted to clean up the car so it wouldn't look like it was Ma and Pa Kettle's (google it, I guess, if that's not familiar to you).

.

You can see the taped joint at upper right were top piece meets side. Had to be untaped and retaped every time I opened the tailgate. Plus duct tape residue all over the place. As with other mods, no confirmation that it actually helped. But if using a good clean design I think it has to help.

__________________
Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.



Last edited by brucepick; 02-09-2008 at 10:38 AM..
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-10-2008, 05:38 AM   #2 (permalink)
EcoModding Lurker
 
Join Date: Jan 2008
Location: Sydney, Australia
Posts: 76

Piaggio Fly 150 - '10 Piaggio Fly 150
90 day: 64.8 mpg (US)
Thanks: 1
Thanked 2 Times in 2 Posts
I was thinking today that you could buy another replacement tailgate from a junk yard and build a more permanent boat-tail on that. Then you could just re-bolt the original hatch on when you want to sell it or look normal hehe.
__________________
Check out my Green Cars Blog and the DIY electric car Wiki. Enjoy!
  Reply With Quote
Old 02-10-2008, 09:32 AM   #3 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,527

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 - '14 Mitsubishi Mirage ES (base)
90 day: 65.39 mpg (US)
Thanks: 4,078
Thanked 6,976 Times in 3,612 Posts
Brucepick - hope you don't mind I split this off into a new thread. It's interesting.

And I agree - I'd like to see a new thread about the Rabbit treatment.

Question about yours: was there much downward taper from the roof line? It may be a trick of the photo, but it seems to be more of a roof line extension, ie straight out.
__________________
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 02-10-2008, 10:45 AM   #4 (permalink)
Master EcoModder
 
Big Dave's Avatar
 
Join Date: Jan 2008
Location: Steppes of Central Indiana
Posts: 1,319

The Red Baron - '00 Ford F-350 XLT
90 day: 27.99 mpg (US)

Impala Phase Zero - '96 Chevrolet Impala SS
90 day: 21.03 mpg (US)
Thanks: 0
Thanked 186 Times in 127 Posts
I like the idea of the junkyard tailgate. I hate to haggle up perfectly good parts. I am neither professional nor proficient enough to indulge in that.
__________________
2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
  Reply With Quote
Old 02-10-2008, 01:17 PM   #5 (permalink)
Pokémoderator
 
cfg83's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
Team Saturn
90 day: 40.49 mpg (US)
Thanks: 439
Thanked 532 Times in 358 Posts
mattW -

Quote:
Originally Posted by mattW View Post
I was thinking today that you could buy another replacement tailgate from a junk yard and build a more permanent boat-tail on that. Then you could just re-bolt the original hatch on when you want to sell it or look normal hehe.
Most excellent idea. That's been one of my eee-vile plans. In the meantime, why not try to prepare mock-ups that attach to the tailgate and still form a flush connection to the side and top of the car?

CarloSW2
__________________

What's your EPA MPG? Go Here and find out!
American Solar Energy Society
  Reply With Quote
Old 02-10-2008, 10:28 PM   #6 (permalink)
MP$
 
diesel_john's Avatar
 
Join Date: Jan 2008
Location: SW Ohio
Posts: 595
Thanks: 5
Thanked 19 Times in 14 Posts
Send a message via MSN to diesel_john
i'll take a pic when the windchill gets back above 0. my hatch is fully functional. the side plexiglass panels slide into a slot at the bottom which makes them stable on the highway. all mounting screws on the hatch are outside the sealing gasket, so no water can get in the cab.
  Reply With Quote
Old 02-11-2008, 03:31 PM   #7 (permalink)
MP$
 
diesel_john's Avatar
 
Join Date: Jan 2008
Location: SW Ohio
Posts: 595
Thanks: 5
Thanked 19 Times in 14 Posts
Send a message via MSN to diesel_john
Smile

hatch is functnl,
side skirts are hinged so i can get my lift arms under there,
full belly pan, except under oil pan.

was inspired by Ernie Roger's bug TDI.

My general rule of thumb is no more than 15 degrees change.

can remove wheels without removing tin work now.

can only see a thin line of the rear treament out the back window.

each vehicle is different, tuft testing is the shortest path to success.
start your tail where the separation is pronounced.
i think, bottom is the most difficult to exit clean and the most important.
other pics and posts thur out this site.
Attached Thumbnails
Click image for larger version

Name:	02-11-08 013cccc.jpg
Views:	215
Size:	93.4 KB
ID:	320   Click image for larger version

Name:	02-11-08 011cccc.jpg
Views:	167
Size:	82.3 KB
ID:	321   Click image for larger version

Name:	02-11-08 008cccc.jpg
Views:	171
Size:	92.0 KB
ID:	322  

Last edited by diesel_john; 02-12-2008 at 01:04 AM..
  Reply With Quote
Old 02-11-2008, 11:13 PM   #8 (permalink)
OCD Master EcoModder
 
brucepick's Avatar
 
Join Date: Dec 2007
Location: Eastern CT, USA
Posts: 1,936

Outasight - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.18 mpg (US)
Thanks: 431
Thanked 396 Times in 264 Posts
Quote:
Originally Posted by MetroMPG View Post
Brucepick - hope you don't mind I split this off into a new thread. It's interesting.

And I agree - I'd like to see a new thread about the Rabbit treatment.

Question about yours: was there much downward taper from the roof line? It may be a trick of the photo, but it seems to be more of a roof line extension, ie straight out.
Thanks for splitting it off for a new thread. I'm going to take a good look at the other pics of the Rabbit back. diesel_john, please write up as much detail as you have time and patience for. And thanks!

Mine did taper downwards. You can see it in the pic at the right corner where the top and side pieces meet. At center maybe not going down quite as much but it did go down. I was trying to be conservative and not have too much of a downward angle. Roof of course is essentially flat/level as it's a long wagon with flat roof.
__________________
Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.


  Reply With Quote
Old 02-12-2008, 12:18 PM   #9 (permalink)
OCD Master EcoModder
 
brucepick's Avatar
 
Join Date: Dec 2007
Location: Eastern CT, USA
Posts: 1,936

Outasight - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.18 mpg (US)
Thanks: 431
Thanked 396 Times in 264 Posts
diesel_john,

Can you post a gaslog? Or is there one somewhere that we can see? What kind of FE improvement have you gotten with your setup?
__________________
Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.


  Reply With Quote
Old 02-13-2008, 08:56 AM   #10 (permalink)
OCD Master EcoModder
 
brucepick's Avatar
 
Join Date: Dec 2007
Location: Eastern CT, USA
Posts: 1,936

Outasight - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.18 mpg (US)
Thanks: 431
Thanked 396 Times in 264 Posts
When I originally suggested this thread (which was split off from another) my intent was to see more information on diesel_john's car. However this thread got titled with my own car's description. Both cars have a large rear face with the large wake that generally produces.

Anyway, based on the guideline of maximum 15 deg. angle to maintain attached flow, I did two drawings. I didn't measure the drawn angles but I think it's close enough for where I/we are now. You can see that to reduce the rear face appreciably on this car you need a reaaaaaaallly long boat tail.

I don't know if I dare build this thing. It would have to be pretty large, which probably means heavy, and also will have a large side profile to catch side winds, with all the construction issues that come from those issues.



Rear view:

__________________
Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.



Last edited by brucepick; 02-13-2008 at 09:10 AM..
  Reply With Quote
Reply  Post New Thread




Similar Threads
Thread Thread Starter Forum Replies Last Post
Partial Kammback prototype tested - preliminary results MetroMPG Aerodynamics 8 11-28-2007 09:51 AM



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