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Old 08-16-2018, 11:35 AM   #1 (permalink)
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Another air curtain question

Hello everyone,

After falling 8 feet from a ladder and messing up my foot/ankle I find myself on the couch with plenty of time to think .

The way I understand it, curtains serve two purposes aerodynamically . One, by moving air out of the high-pressure frontal area making that area smaller . And two, moving that air through the front wheel well and creating the effect of having a front wheel skirt . I know there's a lot of technology and math involved in the placement and direction of this moving air, but my question is, is there any disadvantage to moving the air out of the frontal high-pressure zone, without having it perfectly aimed to create the virtual front wheel skirt?

I have an idea for ducting air from my front bumper/valence into the front wheel well along the contour of the inside edge of the valence. This would exhaust the air parallel to the body of the truck but may hit the outside edge of the wheel . Maybe even 1/4 of the width of the wheel . With some creative tin work I could maybe get it to clear the wheel and hope that the air already moving across the front quarter panel's would help push the exhausted air back where belongs.


I guess I'm thinking about this like someone who makes an aero cap with only a 7° slope. 12° would fit the template better and there would still be turbulence at the back of the vehicle at only 7° , but there would still be an advantage, right? So, would ducting air out of the high-pressure zone in the front create enough of an advantage that the penalty paid for not having it exhausted correctly wouldn't offset it ?

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Old 08-17-2018, 06:55 AM   #2 (permalink)
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Yes are we talking the 03 in sig.
It is do able find a picture, cfd or video of smoke over the aera for your make and moddle would help make an educated guess on deparcher angle. There is an F-150 with theas oem up for studdy. The duct you speek of is called a diverging converging duct. Behind your opening you would flow the 7° -15° max ,however, vortex generators strategically-placed on the insides of Curves would allow you to exceed that 7 - 15° by slightly increasing the size of the turbulent boundary layer but still maintaining a laminar attached flow. Studd there use in FAA approved use to fix plains with bad manners in a stall. 15°off the direction of air move ment. You will have to account for the lost cross sectional flow aera on the easy high pressure out side. A dirt road @35mph following safe distance, but in the dust trail with some video would give you a wind tunnel in free air so to speek.

The central high presher zone would give you the highest pressure differences = highest flow. That is why Aerohead used that aera for his cooling entry.
You could do something like this . Short ducts from the fog light buckets or go from the center.

https://www.bodykits.com/i-24306591-...ip-490187.html
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hope the reading and ideas help the time go by with a bum leg. Best of luck with the recovery
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Old 08-18-2018, 11:18 AM   #3 (permalink)
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I don't see anyone ducting air from a central schnorkel, too much internal skin friction. It should be a converging duct with a tall narrow exit. The target is the back edge of the wheelwell. The objective is to prevent air rolling outward from the opening.

I don't know whether the exit must be parallel to the side/outside the tire face, or angled out at 45°/on the outer tread.
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Old 08-18-2018, 02:22 PM   #4 (permalink)
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What I am looking at is the empty headlight pods on either side of the bumper. If I cut out the "square-ish" hole in the back of the pod opening and block off the rear (inner edge)of the bumper, there should be plenty of air pressure at 55 miles an hour to move the air through the cavity I'm creating and exhausting it at the edge of the bumper . It would be in fact a tall narrow opening.
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Old 08-18-2018, 02:23 PM   #5 (permalink)
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If it wasn't for getting hurt at work and having to leave my truck at the job site, I be able to take pictures. I'm hoping that I can get the truck home early next week and hobble my way out there and get some better pictures of what I'm hoping to do .
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Old 08-18-2018, 04:38 PM   #6 (permalink)
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Opening up the side scoops could work. Could it could feed to an inner fender liner?
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Old 08-20-2018, 08:31 AM   #7 (permalink)
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Quote:
Ford Ranger Raptor Officially Breaks Cover
The bumper is mounted on the frame for durability and installed in it are LED fog lamps with functional air-curtain ducts that helps reduce air resistance.
Sorce:
https://www.carmudi.com.ph/journal/f...-breaks-cover/
Food for thought you'll be able to just reshape the wheel insted of having to reinvent it. you're forced time off does not allow me to suggest just buying the ready-to-run bumper and installing, that and I'm a built not bought guy.
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20


Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg


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Old 08-20-2018, 06:14 PM   #8 (permalink)
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I'm definitely a build not buy kind of guy. I have been nicknamed MacGyver on many job sites. One of my goals for this truck is to keep it as truck looking as possible while squeezing every last drop of FE out of it.
The conversation at lunchtime always seems to roll around to our vehicles and I usually slide in my mpg numbers somewhere. It opens up a dialogue and I can try and pass on some insight. Usually it's nothing more than "nut behind the wheel" techniques. Some guys even ask me if I've improved since the last time they asked.
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Old 08-21-2018, 10:27 AM   #9 (permalink)
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If the air curtain duct design on the new Ranger is similar to that of the F-150, it's separate from the bumper cover--which won't fit your 2003 without modification anyway. The F-150 is the only vehicle on the American market that uses a horizontal inlet for the air curtains, with the intake sitting between the headlight and the top of the bumper cover:



What you should do is order a couple of those and fit them to your Ranger, which should be both cheap and easy. I have Hyundai Ioniq curtain ducts on my list to buy, at $6 each, to fit to my Prius.
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Old 08-21-2018, 01:34 PM   #10 (permalink)
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Quote:
Originally Posted by Vman455 View Post
The F-150 is the only vehicle on the American market that uses a horizontal inlet for the air curtains, with the intake sitting between the headlight and the top of the bumper cover...
Until I figure it out.

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