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-   -   Flat Bonneville-type spoiler (

AeroModder 10-22-2010 08:19 PM

Flat Bonneville-type spoiler
So we stop going off-topic in the Sedan-Kamm thread, I figured a new one should be made.

I went ahead and fitted my car with a 15" trunklid extension, modeled after the Fusion.

The trunk and spoiler have a 2-3* downward angle, and the sides of the spoiler continue the 3-4* boattailing of the trunk. The vertical end plates meet the corners of the car at about a 10* angle. The roofline meets the end of the spoiler at about a 15-16* angle.

We'll see if this shows any noticeable effect.

cfg83 10-22-2010 08:47 PM

AeroModder -

Good idea to make this a separate thread. We've talked about this spoiler in the past and speculated its downforce versus virtual-boattail versus hide-the-parachute functionality.

I am really really really really hoping the virtual-boattail wins because this mod looks cool.


SlideWRX 10-22-2010 11:51 PM

While the trunk extension will at least look 'race inspired', I think getting one for the underbody/bumper may help as well. Maybe a square with rounded corners. Have another one inside of it, that sticks out further, and see if we can duplicate the effects of a boattail with a different shape!

3dplane 10-23-2010 12:57 AM

Now I'm curious too how that will perform! I hope you can do some coastdown tests!
Looking at your pic I can't stop to imagine a visual on people's face whom are wondering - what the **** is all that on that car? - : )
It would be pretty cool though if it showed a positive difference in drag reduction!


Weather Spotter 10-23-2010 09:07 PM

Data for the wiki would be nice. If it works I will make a new Mod listing for it, and your pic goes up first :)

AeroModder 10-23-2010 09:48 PM

My established coast testing starts at 45 MPH and compares speeds at set points (road signs). I'll see if there's any improvement, but I'm not sure if it'll show up at lower speeds like this. I've pretty much hit a plateau some time ago and can't get any better coasting.

Otherwise, the only other indicator is tank MPG, and that isn't the greatest measurement of single mods. It'll be at least a week before I get those numbers.

Weather Spotter 10-23-2010 09:55 PM

When ever you get the data will be fine. I take what I can get :)

AeroModder 10-24-2010 10:56 AM

The design seems pretty structurally sound. It's been subjected to gusty sidewinds and plenty of rain overnight and it doesn't look phased. I added a couple supports before the storm, though.

Hasn't been driven yet, but I'll be getting plenty of testing on Monday, including some freeway driving.

AeroModder 10-25-2010 11:32 PM

Update: I'll have to wait until next tank for any decent results. This tank is already shot from crosswinds and lots of rain, and bumper-to-bumper traffic for 3 miles. I already went past a quarter tank and didn't even cover 80 miles. I'll be lucky to see 26 on this one.

pounsfos 10-26-2010 01:33 AM

this is going to be an interesting test, i think you will see an improvement in FE but only a couple of miles per galleon (anythings better than nothing though)

thats my guess and im sticking with it :)


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