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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-31-2012, 01:42 AM   #1 (permalink)
Deadly Efficient
 
Tango Charlie's Avatar
 
Join Date: Jun 2008
Location: Northern Indiana
Posts: 1,231

Olivia - '03 Pontiac Vibe base
90 day: 36.01 mpg (US)

R2-D2 - '00 Honda Insight
90 day: 58.81 mpg (US)
Thanks: 132
Thanked 167 Times in 86 Posts
CARGaerO t'ailer; a hitch-mounted boat tail (Pontiac Vibe)

I've decided to make a truncated boat tail for my Vibe.

It will be attached to the hitch-mounted cargo carrier that I made a while back. The first version of the cargo carrier, being made of angle iron and 1/2" plywood, was quite heavy. It also rode too low. It drug the ground a couple times when I used it.



So I made a "version 1.2" and it has worked much better. I used aluminum angle and paneling to make it lighter weight. I elevated the deck and angled it up slightly to keep it from dragging over bumps and inclines.


Then I saw the Audi with the hitch-mounted tail from the Netherlands. Well, I loved the aluminum construction, but realized it was out of the question once I priced some aluminum sheets at a nearby RV surplus yard. I nearly gave up on the idea until I remembered that Coroplast was only $12 a sheet. Hmmm... I started doodling...


Yeah, you saw it here first; the CARGaerO t'ailer. It's copyrighted.

I used seifrob's Aero Template Overlay tool to get a better idea of what I was after. I cleaned it up in MS Paint and it started to look promising.


I'm ending it 34 to 36 inches behind the rear bumper, to keep the cargo carrier deck accessible. The rear bulkhead will have a door to load luggage through. I will install a set of trailer lights and a license plate holder on the rear bulkhead/door. Construction will be almost entirely out of Coroplast.
Can I persuade the Coroplast to make the shape I'm envisioning? Will it be done before Weather Spotter and JethroBodine show up for the Labor Day Michiana Meet-Up? I'm not entirely sure. But I'm gonna try.

__________________
-Terry





My Pet Threads: What's in a UserName? and YKYAEI and
Hitch-mounted boat tail; the CARGaerO t'ailer
  Reply With Quote
The Following 8 Users Say Thank You to Tango Charlie For This Useful Post:
aerohead (08-02-2012), BamZipPow (07-31-2012), Cd (08-04-2012), Flakbadger (08-13-2012), HHOTDI (12-14-2012), KamperBob (08-01-2012), Vekke (12-15-2012), Weather Spotter (08-05-2012)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-31-2012, 01:54 AM   #2 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 11,746

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,299
Thanked 2,692 Times in 1,743 Posts
It's gonna be nice, I can see that already.

I saw that Audi tail too, and started a mock-up on the 'Coupe...
__________________


  Reply With Quote
The Following User Says Thank You to Frank Lee For This Useful Post:
Tango Charlie (08-01-2012)
Old 07-31-2012, 08:02 AM   #3 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 18,999

Blackfly - '98 Geo Metro
Team Metro
90 day: 67.58 mpg (US)

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

MPGiata - '90 Mazda Miata
90 day: 38.25 mpg (US)
Thanks: 1,811
Thanked 4,479 Times in 2,239 Posts
Subscribed. I've been noodling something like this for the Insight.... right around 2018 at the pace I tend to get things done!!

FYI, if you're still thinking about aluminum, one source of inexpensive thin sheet metal: rolls of roofing "flashing". It's not very wide though, so you'd have lots of riveting to do.
__________________
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
The Following User Says Thank You to MetroMPG For This Useful Post:
HHOTDI (12-14-2012)
Old 07-31-2012, 08:04 AM   #4 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 18,999

Blackfly - '98 Geo Metro
Team Metro
90 day: 67.58 mpg (US)

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

MPGiata - '90 Mazda Miata
90 day: 38.25 mpg (US)
Thanks: 1,811
Thanked 4,479 Times in 2,239 Posts
Quote:
Originally Posted by Tango Charlie View Post
I elevated the deck and angled it up slightly to keep it from dragging over bumps and inclines.
You mean "bottom taper angle" didn't enter your mind at all when you were angling it up?
__________________
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
Old 07-31-2012, 10:25 AM   #5 (permalink)
HocusPocusSlocusGocus
 
Join Date: Jul 2012
Location: Detroit, MI, United States
Posts: 27

Slocus - '00 Ford Focus ZX3
Thanks: 1
Thanked 10 Times in 6 Posts
This is fantastic. I have often considered doing something similar, if only to support an easily-removable box cavity instead of a full aero extension. Looks like you're off to a good start. I am eager to see how yours comes together.
__________________
There are two ways to become rich; earn more or want less.
  Reply With Quote
Old 07-31-2012, 10:35 AM   #6 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,024

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

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 66.02 mpg (US)
Thanks: 6
Thanked 509 Times in 246 Posts
One of the cheaper source for aluminum sheets and bars is Aircraft Spruce, where you can buy it online (Aluminum from Aircraft Spruce). They are MUCH cheaper than Lowe's or even McMaster-Carr.

One problem with using Coroplast for a trailer (or anything that will be continually exposed to the sun) is that will get brittle and start to break down after a year or two of sun exposure unless you keep it painted (and paint doesn't stick very well to polypropylene).
__________________
aerocivic.com
  Reply With Quote
The Following 3 Users Say Thank You to basjoos For This Useful Post:
aerohead (08-02-2012), Cd (08-04-2012), christofoo (09-18-2012)
Old 07-31-2012, 01:05 PM   #7 (permalink)
Deadly Efficient
 
Tango Charlie's Avatar
 
Join Date: Jun 2008
Location: Northern Indiana
Posts: 1,231

Olivia - '03 Pontiac Vibe base
90 day: 36.01 mpg (US)

R2-D2 - '00 Honda Insight
90 day: 58.81 mpg (US)
Thanks: 132
Thanked 167 Times in 86 Posts
Thanks, Frank Lee. I appreciate that!

Metro, I didn't measure the angle really. Just used TLAR (That Looks About Right). I figured that it was above the bottom edge of the bumper, and would be in the wake behind the car. I wasn't thinking of installing a boat tail when I made that modification.
Some care will be taken with the 'diffuser angle' of lower skin of the T'ailer, however.

Thanks, basjoos. Spruce was one of the first places I checked, actually. I use them quite a bit in my line of work as an A&P. The local RV surplus yard was a bit cheaper than Spruce, but still more than I was willing to spend on this project.
I did consider the UV affect on Coroplast. But the T'ailer won't be installed permanently on the car. It will be used on long trips that are in my future. (I am applying with Mission Aviation Fellowship in Nampa, ID. We are scheduled to go out there in January for Candidacy. There will be several trips to Nampa and back in the next couple years. And probably a bit of travel as we raise support before we leave for overseas.) The rest of the time it will probably be hung from the garage ceiling. The wife is already cringing at what it's gonna look like.

I ordered three sheets of dark blue Coroplast from my local sign shop. They charged me 17 bucks a sheet and had them the next day. I'm impressed!

__________________
-Terry





My Pet Threads: What's in a UserName? and YKYAEI and
Hitch-mounted boat tail; the CARGaerO t'ailer
  Reply With Quote
The Following 2 Users Say Thank You to Tango Charlie For This Useful Post:
aerohead (08-04-2012), HHOTDI (12-14-2012)
Old 07-31-2012, 02:14 PM   #8 (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
You stole my idea.

Actually mine will be on a sedan, which will make it easier... but it's still going to be a couple of years before I get around to it.

I added a hitch receiver a few years ago to my civic to get a cargo rack in my slipstream, which had the benefit of having 0 impact on FE. Then I learned about boat tails and realized that's the next step.

Looking forward to seeing your results.
  Reply With Quote
Old 07-31-2012, 02:15 PM   #9 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 18,999

Blackfly - '98 Geo Metro
Team Metro
90 day: 67.58 mpg (US)

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

MPGiata - '90 Mazda Miata
90 day: 38.25 mpg (US)
Thanks: 1,811
Thanked 4,479 Times in 2,239 Posts
OT: but, hey! I like your ecomodder.com decal application. Creative & looks good!
__________________
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
The Following User Says Thank You to MetroMPG For This Useful Post:
Cd (08-04-2012)
Old 07-31-2012, 09:32 PM   #10 (permalink)
Master EcoModder
 
Join Date: Nov 2008
Location: Cincinnati
Posts: 323

Civic CX/HX - '97 Honda Civic CX/HX
Team Honda
90 day: 63.77 mpg (US)
Thanks: 12
Thanked 48 Times in 35 Posts
subscribed!

__________________
  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