Aero template request
 

I really suck with computers, would anyone be able to put the aero template overlay onto a 2000 dodge neon for me? I would really appreciate it! :thumbup:

Bump, anyone? I would really appreciate it

Hang on a sec.

http://i1201.photobucket.com/albums/...M/neontail.jpg

Best I could do on short notice.

D'oh! Sven, you beat me to it( and better, too:o:D).

Sweet!! Thank you guys so much! Im surprised to see how close the trunk lid comes to the template line, which makes my next job a lot easier :)

Is there a different scale used between the two pictures? I see the line on the second one extends farther behind the trunk lid.

Mine is true scale. You can measure off it and it should be exact to the car. When planning mods it's best to have as little perspective as possible and the blueprint is perfect for that.

Your rear window is pretty darn close to template. You might consider tuft testing it first to see what's actually happening.

Thats the plan, im going to try tuft testing it to see if the airflow remains attached, considering doing some coastdown testing with a decklid extension and/or roof spoiler

Definitely. If you're doing coast down testing I wonder if you'd be up for a little experiment. I don't own a sedan so I can't do it :)

Search the forum for "coventry papers" and read about the "base plates". I was wondering if one could make something like that that goes vertically up from the edge of the trunk, like a Bonneville spoiler that goes up (instead of out) to meet the template. Does that make sense? The advantage would be if it were made out of plexi it would barely be visible.

I just thought if you're doing it maybe you'd be down. A suggestion :)

That makes sense,I will look into that and try to figure out a good way to attach it and gibe it a try! After tufting to see what Im working with I really want to try a decklid extension.

I guess the idea of the base plate would be to "trap" a vortex to force the air to follow the template? In the theory it seems reasonable, but of course air is unpredictable. I'm sure that matching the height in the centre would be easy, determining how much to curve it down on the edges might have to be some trial and error.

What pic are you looking at? :confused:

My pic was a grab off the web, Svens is true to scale. I looked for a drawing but couldn't find one quickly, hence the out of perspective rendering.

I'm with Frank. I don't think you will get attached flow as the rear roofline deviates from template fairly early.

I belive what you are describing is considered a gurney flap named after Dan Gurney in the 60's who used it on a Le mans racer finding minimal drag with huge downforce. Correct me if I am wrong.

http://i46.tinypic.com/ddjoud.jpg

Here's my 2¢.

You shred the air at the top of your rear window.

If you really want to improve the shape, you must follow the template with something solid, a roof spoiler or a rear deck lid extension won't do much.

The air needs to "ride down" on something in order to return its energy back to the car, by the time it hits the extension it is too late, if you cut off flow with a roof spoiler, you really aren't improving on what you already have. The current shape is not terrible, it just isn't optimal. You have to add a "Kamm" extension to optimize.

Sorry to do this Sven, but I think you need to look closer at your template, it appears to be out of proportion with what the standard is.

Here is a small pic.

http://i49.tinypic.com/jtpf14.jpg

and a link to a more detailed one.

Big Sven 2 Templates Compared

I have been very meticulous in maintaining this exactly. On several occasions I have slipped up and forgotten to maintain the aspect ratio thereby ending up with an out of proportion image.

You can see my template on top of Phils, I have verified again before creating this image, that Phils Image is the 1.78 aft ratio. My analysis of your template is about 1.5 aft ratio. The fronts are really not too important as we know.

Charlies Template on Phils Drawing

The one I've been using is a little different, but closer to Chaz's.

Automobile 2 - Odds and Ends pictures by kach22i - Photobucket
http://i184.photobucket.com/albums/x...lay-e9ep2s.jpg

Some ideas from an older thread. http://ecomodder.com/forum/showthrea...tml#post217527

I'm using this one. If it's wrong let me know and I'll delete it from my computer. Maybe we should sticky the Template Part C thread.

http://i48.tinypic.com/20a4h.jpg

Don't know what a Gurney flap is. Basically a spoiler?

I'm not trying to say the base plate thing would be the final product, or that it should be used. I was hoping for a little data on it to see if it would even help. It was supposed to be a research project.

Of course a Kammback/boat tail will be your best bet for drag reduction. As long as we're testing the car we might as well test alternatives based on Coventry University data to see if there are other options for those pressed for time or money.

Gurney flap ... Think nascar rear spoiler

Similar, but shaped as if it were a section of the template teardrop in 3D. Rounded on the sides to meet the plan taper, and all that. Meant 100% for drag reduction and not necessarily downforce.

Gurney flap
 

If you can find a photo of a 1969 Ford Torino Talladega,you'll see a Gurney flap used on this car.Very small,90-degree angle.

am i doing this right?

http://a2.sphotos.ak.fbcdn.net/hphot...45506469_n.jpg

Klaatu Barada Nikto!

For what its worth, I did tuft testing a couple of years ago on a 1st gen neon coupe, and there was significant detachment on the rear window and trunk/factory spoiler. Anything past 1/4 the way down the window, and the tufts were facing forwards.

Sven, It looks great here, just be sure when you overlay it onto stuff you don't change the aspect ratio. It appears as though you shortened it when you put it on top of the Neon is all.

Thanks for all your good works! I hope I have not dimmed your spirit in any way. You are such a valuable part of Ecomodder.

Much respect,
Charlie

?
 

Looks dead on to me.Ford gave you a very nice starting point. Happy modding!:)

WTF I just overlayed them in Photoshop and the Neon one is indeed squished. Can't believe it. :confused: Good eye!

A bunch of people in this forum got pretty picky when I made the same analogy.

See here:
http://ecomodder.com/forum/showthrea...uck-18005.html
http://i184.photobucket.com/albums/x...20Up/GUR-8.jpg

Technically speaking, a Gurney flap is on a wing (and only a wing).

Anything else is merely a rear spoiler.

If the thing looking like a Gurney flap is on the trailing edge of something looking like a wing (fiberglass trunk lid bolt-on), but there is no air flow under it, then it is a spoiler on a spoiler, not a Gurney flap.

Thanks for the extra images and input! Ive been swamped working on the El Camino all weekend and totally neglected the Neon. But some test ideas are in the works already :)