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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-23-2014, 06:50 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Jun 2014
Location: appleton, wi
Posts: 10
Thanks: 0
Thanked 1 Time in 1 Post
My Kamm back

What do you guys think about it.. Should it be higher?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-23-2014, 07:15 PM   #2 (permalink)
Master EcoModder
 
mikeyjd's Avatar
 
Join Date: Mar 2013
Location: Grand Rapids, MI
Posts: 838

Matchbox - '93 Ford Festiva L
Team Ford
Last 3: 70.16 mpg (US)

Salamander - '99 Chrysler Concorde LXI
Team Dodge
90 day: 30.3 mpg (US)

Urquhart - '97 Toyota Tacoma 4x4 V6 3.4L DLX
Pickups
90 day: 25.81 mpg (US)

Smudge - '98 Toyota Tacoma
90 day: 40.65 mpg (US)

Calebro - '15 Renault Trafic 1.25 dci
90 day: 39.39 mpg (US)
Thanks: 1,380
Thanked 209 Times in 155 Posts
hard to say

Quote:
Originally Posted by counterbond View Post
What do you guys think about it.. Should it be higher?
We would need a side shot of the car to compare it with the template.

Here is a link to the template Aerodynamic Streamlining Template
  Reply With Quote
Old 06-23-2014, 07:18 PM   #3 (permalink)
The Dirty330 Modder
 
Gealii's Avatar
 
Join Date: Dec 2011
Location: North East Ohio, USA
Posts: 642

CruzeRS - '15 Chevy Cruze LT RS
90 day: 41.29 mpg (US)
Thanks: 10
Thanked 67 Times in 59 Posts
i request a more side pic of the whole car as it sits now. Not an angled pic like this one. I want this so i can put the aero template to it and see how good it is. either way it should be an improvement.

or it can be done yourself
Aero Template Overlay ver.0.6-alpha

just align the "0" to the tallest part of your car
__________________



"The only real mistake is the one from which we learn nothing."
- Henry Ford
  Reply With Quote
Old 06-23-2014, 07:18 PM   #4 (permalink)
Spaced out...
 
spacemanspif's Avatar
 
Join Date: Jul 2013
Location: Dirty Jersey
Posts: 748

The New Focus - '07 Ford Focus ZX5
90 day: 32.44 mpg (US)
Thanks: 142
Thanked 205 Times in 149 Posts
Not sure how long the tape will hold up but I'm very interested to see your results. Did you rivet the sides right to the body?

How did you get the plexiglass skirts to flex out at the front to clear the lower half of the wheel/tire?
__________________
-Mike

2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014

Cost to Operate Spreadsheet for "The New Focus"

  Reply With Quote
Old 06-24-2014, 03:38 PM   #5 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,861
Thanks: 23,922
Thanked 7,207 Times in 4,640 Posts
edge radii

Your headed in the right direction,and as soon as we get an image we 'll be able to tell about the downslope.
One thing I want to mention is that these rooflines need some softened edges where the roof and sides come together.With a hard intersection they're prone to create longitudinal vortices which have remarkably high drag.
Here's an image of Kamm's personal car and one of his wind tunnel models with the hard edges.You can see the tufts 'flying' into the vortices,the whole length of the car.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 06-25-2014, 08:10 AM   #6 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 4,150

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,784
Thanked 1,922 Times in 1,246 Posts
A fitst step, however ugly, is better than not taking the step. Like 99% of us. Great job, I can't wait to see how it gets over time!
__________________

Quote:
Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

  Reply With Quote
Old 06-25-2014, 12:29 PM   #7 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,562
Thanks: 7,738
Thanked 8,554 Times in 7,041 Posts
Quote:
What do you guys think about it.. Should it be higher?
Do you plan on changing it? Absent the requested side view, I'd say "Not higher—longer." It appears to be sway-backed, The center could be a few inches higher making a convex curve. Lay a flexible strip on the roof and let it sag to the 12° angle and follow that.

Notice the way Redneck handled the rear wheelwells on his Geo XL1, smoothing over the wheel arch and bumper.



How stiff is the clear material you used (I assume that rectangle on top is clear as well)? If it vibrates, that is unhelpful.
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (06-25-2014)
Old 06-25-2014, 07:14 PM   #8 (permalink)
EcoModding Lurker
 
Join Date: Jun 2014
Location: appleton, wi
Posts: 10
Thanks: 0
Thanked 1 Time in 1 Post
  Reply With Quote
The Following User Says Thank You to counterbond For This Useful Post:
aerohead (06-26-2014)
Old 06-26-2014, 03:31 PM   #9 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,861
Thanks: 23,922
Thanked 7,207 Times in 4,640 Posts
Kamm back

Quote:
Originally Posted by counterbond View Post
counterbond,you're on the right track.Here is a drag table from Hucho's optimization study of the 1st-gen Golf/Rabbit.The Golf happens to hit a drag minimum up near the 'Template'.VW was not allowed to build like this,as it violated Giugiaro's 'styling',although,you can see that we had to wait quite a while to see a VW with drag as low as the 1974 results.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 06-26-2014, 09:13 PM   #10 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,562
Thanks: 7,738
Thanked 8,554 Times in 7,041 Posts


Here's what I meant by "lay a flexible strip on the roof". I used 16' long wood strips because I was interested in the windshield area as well.

  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (06-27-2014)
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