08-02-2012, 04:32 PM
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#11 (permalink)
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EtOH
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Here's a side profile on the new HB.
It's a thumbnail so click for the full image.
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-Allch Chcar
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08-02-2012, 06:29 PM
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#12 (permalink)
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Master EcoModder
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
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wagon/hatch
If the pressure is different around the perimeter of the separation line,flow into a lower pressure area will introduce shear which can spin up into vortices which will absorb significant power.
The separation line also dictates the base pressure of the wake.
The station wagon would have a nice uniform pressure whereas is it is questionable for the other car.
The 2013 Focus of Cd 0.29 pushes the roof back like a wagon.It is PURE K-form!
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08-02-2012, 06:42 PM
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#13 (permalink)
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Master EcoModder
Join Date: May 2008
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I think it is the crisp trailing edge next to the tail lights that help lower the drag more than anything else we can see in that picture. Good on Ford -- that is about a 20% reduction in drag.
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08-02-2012, 07:52 PM
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#14 (permalink)
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Ultimate Fail
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Quote:
Originally Posted by NeilBlanchard
I think it is the crisp trailing edge next to the tail lights that help lower the drag more than anything else we can see in that picture. Good on Ford -- that is about a 20% reduction in drag.
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Just think of all the thousands of gallons of oil that were burned because Ford decided not to put a simple creased edge on all the thousands of Focus cars they produced over the years ! 
To the OP : looks like its time to break out some clear plexi pieces over those lights !
And we would all love to see a tuft test of the area ! |
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08-02-2012, 08:50 PM
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#15 (permalink)
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EcoModding Lurker
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Good thing, I've got a wagon  |
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08-02-2012, 11:40 PM
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#16 (permalink)
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Master EcoModder
Join Date: May 2008
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Every car maker can get a 20% reduction is drag, if they tried.
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08-02-2012, 11:42 PM
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#17 (permalink)
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Master EcoModder
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Yes. If people only didnt buy cars based on the looks.
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08-03-2012, 07:44 AM
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#18 (permalink)
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Master EcoModder
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Low aero drag looks great to me.
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08-03-2012, 08:44 AM
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#19 (permalink)
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EcoModding Apprentice
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How did you find the cD figures for the Focus lineup? I've tried unsuccessfully to find the cD of various vehicles and have finally quit trying......
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08-03-2012, 09:43 AM
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#20 (permalink)
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HocusPocusSlocusGocus
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I actually performed a brief tuff test on the rear taillight/window area of my ZX3 last night using my stickypod on the back window. Airflow along the back window is not exactly what I had expected. This was a really quick setup... I didn't get the best angle for the shot, and only a brief stint at 65MPH, but I'll post up some screenshots later tonight.
Quote:
Originally Posted by gasstingy
How did you find the cD figures for the Focus lineup? I've tried unsuccessfully to find the cD of various vehicles and have finally quit trying......
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Google. I found them on half a dozen car websites. Someone had re-posted them on this site as well. The numbers vary but I saw .30 for the wagon consistently, .31-.32 for the sedan and .35-.36 for the hatchback.
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