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Old 02-22-2008, 05:35 PM   #21
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That's what I had in mind too.
I like Charles Bs' idea of pinching the wake inward with the roof rack extentions.
I wonder if adding a 'wing' like I illustrated above the roof extention ( lower spoiler ) would create a higher pressure to the airflow - again pinching the wake and forcing the wake to stay attached to the teardrop shape farther from the back of the car.

It would sort of a 'biplane wing' set up.


It would be easy to test - just strap a sheet of something to the top of the roof rack.
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Old 02-22-2008, 05:38 PM   #22
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Quote:
Originally Posted by charlesB View Post
I agree, why not embrace the roofracks and use them as part of a functional and stylish solution. Something like a SPORTKAMM would do the trick....



Did you draw this ? ( Nice ! )
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Old 02-26-2008, 09:18 AM   #23
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I'm still trying to figure out why I saw my best tank on my Escort wagon with two bikes strapped to the back...

I figure the Audi A2 gives us some good clues about how to proceed though...
http://en.wikipedia.org/wiki/Image:Audi_A2_L_Silber.jpg
Very low Cd.

I figure you can either use either a rear window air deflector type spoiler to bring air down the back, or use a surface extension to entrain flow. I've also been considering the possibility of a deflector extending back abover the windshield by 3 inches.... yes it gains CSA, but by making the forebody "fatter" at the top, it might cause the air to take a path at an angle further back, meaning that it attaches to the rear surface longer, and reduces base drag. Anyone with a wagon with a tilt up sunroof, might like to experiment as to whether overall aerodynamics seem improved with it up or closed.

On my '88 Voyager, with rather square tailgate edges, I am planning to try attaching quarter rounds cut from pool noodles around the hatch, hoping the curved surface will entrain more air behind the vehicle.

Recently saw a Chevrolet Aveo that had a negative incidence rear spoiler/deflector, that looked promising. Not sure what I'm doing for the back of the Escort when it's back together again, think it might just need a deflector to keep the air nailed down further back. May try tumble strips/turbulators around the back.

Be interesting to carve humps out of styrofoam and stick them on top see if they make a difference.
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Old 02-28-2008, 09:29 AM   #24
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Last summer I did some very informal testing with my Passat wagon with the sunroof open and closed. It is not a flip up design as you are talking about here but has a small piece at the front that snaps up to deflect air up slightly. I thought I was crazy but I consistantly was getting slightly better mileage with the sunroof open. Perhaps your theory explains it. When the weather gets nicer I will try a more serious A-B-A test!

Phil


Roadwarrior said:

"I figure you can either use either a rear window air deflector type spoiler to bring air down the back, or use a surface extension to entrain flow. I've also been considering the possibility of a deflector extending back abover the windshield by 3 inches.... yes it gains CSA, but by making the forebody "fatter" at the top, it might cause the air to take a path at an angle further back, meaning that it attaches to the rear surface longer, and reduces base drag. Anyone with a wagon with a tilt up sunroof, might like to experiment as to whether overall aerodynamics seem improved with it up or closed. "
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Old 02-29-2008, 04:46 PM   #25
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Patience is a virtue I don't seem to have....... So when my VG's arrived today, I went right out and installed them......So much for the two month average oh well. we'll see if it all helps then.
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Old 03-02-2008, 05:26 AM   #26
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last week I took a trip out of town this photo is upon returning.
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Old 03-03-2008, 12:20 PM   #27
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I see you used your windshield washers a lot on the trip.
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Old 03-03-2008, 04:31 PM   #28
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LOL that is after not using them for the whole winter I needed them and the resivoir was almost empty. DARN BUGS!!!!
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