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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-28-2018, 03:44 PM   #41 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,561
Thanks: 7,736
Thanked 8,554 Times in 7,041 Posts
Pix pleez.

Once it's all secured with tape, four coats of Plastidip. I'm sure there's a combination like Pearlizer over Real Aluminum that would closely match your paint.

Cutting concave curves on the sides and convex across the top is the modern style.

__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-01-2018, 02:33 PM   #42 (permalink)
Master EcoModder
 
Join Date: Jun 2016
Location: KY
Posts: 1,346

IGL - '04 Saturn Ion
Team Saturn
90 day: 56.19 mpg (US)
Thanks: 63
Thanked 364 Times in 268 Posts
So I’ve noticed my Kamm lifting as I drive... as speed increases, the trailing edge rises... I still think I have more drag than without the visor/Kamm... in the rain the water seems to be moving almost horizontally across the backlight...
__________________
My current Ecotec project...


My last Ecotec project...
  Reply With Quote
Old 04-02-2018, 04:16 AM   #43 (permalink)
Master EcoModder
 
Join Date: Jun 2016
Location: KY
Posts: 1,346

IGL - '04 Saturn Ion
Team Saturn
90 day: 56.19 mpg (US)
Thanks: 63
Thanked 364 Times in 268 Posts
So I took off my Kamm for revision and am driving the car without it while it’s being reworked(slot in front and better edge reinforcement)... as it was, it seems to have been costing me a few percent... instant MPG with the visor/Kamm on was around 31@43-45% load (remember this thing is running on three cylinders and in open loop) and with the Kamm off I can hold 55mph at around 38-40% load and about 36mpg instant...

I thought of cutting a whole new one a little longer(16”vs 14”) and positioning it a little lower on the glass(1.5” below the top of glass instead of st the top)... such a visor and position would yield the max length possible without interfering with the trunk lid...
__________________
My current Ecotec project...


My last Ecotec project...
  Reply With Quote
The Following User Says Thank You to 19bonestock88 For This Useful Post:
Ecky (04-02-2018)
Old 04-02-2018, 06:22 AM   #44 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: New Zealand
Posts: 5,005

ND Miata - '15 Mazda MX-5 Special Package
90 day: 42.54 mpg (US)
Thanks: 2,866
Thanked 2,501 Times in 1,547 Posts
Fully warmed up, and with similar weather?

Aerodynamics is a bit of a black art.
  Reply With Quote
Old 04-02-2018, 06:43 AM   #45 (permalink)
Master EcoModder
 
Join Date: Jun 2016
Location: KY
Posts: 1,346

IGL - '04 Saturn Ion
Team Saturn
90 day: 56.19 mpg (US)
Thanks: 63
Thanked 364 Times in 268 Posts
Car was at normal operating temp, and it was a little warmer/dryer when I was driving with the visor on the car(should have made its mileage better in comparison to my recent trip with the visor off)... temp difference wasn’t huge and the road moisture difference wasn’t too bad either...
__________________
My current Ecotec project...


My last Ecotec project...
  Reply With Quote
Old 04-02-2018, 09:44 AM   #46 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,513

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.71 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: 60.16 mpg (US)
Thanks: 4,058
Thanked 6,957 Times in 3,602 Posts
"Kammbacked" Civic sedan

Tardy reply - apologies...

Quote:
Originally Posted by mpg_numbers_guy View Post
I know there have been myriads of threads related to kammbacks and boattails for hatchbacks, but how about sedans?






I "Kammbacked" my 2007 Civic so that I could later add a full tail and keep the "template" curve.



Unfortunately, the Kammback mod on its own (no tail) appeared to make NO difference in A-B testing:

Quote:
I actually also compared Kamm alone (no tail) vs. bare car, and the Kammback appears to have made no difference. 49.2 mpg with it on, 49.2 mpg with it off, 8 runs total (each way).
Build thread: http://ecomodder.com/forum/showthrea...dan-31498.html
__________________
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
The Following 4 Users Say Thank You to MetroMPG For This Useful Post:
aerohead (04-07-2018), BamZipPow (04-02-2018), Ecky (04-02-2018), freebeard (04-02-2018)
Old 04-02-2018, 11:07 AM   #47 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: New Zealand
Posts: 5,005

ND Miata - '15 Mazda MX-5 Special Package
90 day: 42.54 mpg (US)
Thanks: 2,866
Thanked 2,501 Times in 1,547 Posts
@MetroMPG, what were your construction materials for that kamm?
  Reply With Quote
Old 04-02-2018, 12:10 PM   #48 (permalink)
Moderator
 
Vman455's Avatar
 
Join Date: Feb 2012
Location: Urbana, IL
Posts: 1,935

Pope Pious the Prius - '13 Toyota Prius Two
Team Toyota
SUV
90 day: 51.62 mpg (US)

Tycho the Truck - '91 Toyota Pickup DLX 4WD
90 day: 22.22 mpg (US)
Thanks: 198
Thanked 1,797 Times in 937 Posts
One snowstorm a few years back, this is the shape the wind came up with on a parked Civic:





__________________
UIUC Aerospace Engineering
www.amateuraerodynamics.com
  Reply With Quote
Old 04-02-2018, 12:17 PM   #49 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: New Zealand
Posts: 5,005

ND Miata - '15 Mazda MX-5 Special Package
90 day: 42.54 mpg (US)
Thanks: 2,866
Thanked 2,501 Times in 1,547 Posts
Some snow kamms I've seen locally:



  Reply With Quote
The Following User Says Thank You to Ecky For This Useful Post:
BamZipPow (04-02-2018)
Old 04-05-2018, 09:15 AM   #50 (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
The old Snow Kamm Thread - I like that term Ecky.

http://ecomodder.com/forum/showthrea...ing-27509.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
  Reply With Quote
Reply  Post New Thread


Tags
boattail, civic, kammback, sedan

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