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Old 10-22-2010, 04:30 PM   #41 (permalink)
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heh
not really, unless its corroborating with my theory of using the wingtail for downforce

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Old 10-22-2010, 10:40 PM   #42 (permalink)
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Quote:
Originally Posted by AeroModder View Post


The Bonneville flat spoilers also have vertical plates on the sides.
I'll bet that helps interrupt vortex creation. On wings (planes or race cars), side plates effectively extend the wingspan, but I think they are also used to minimize vortex's. In this case, they probably also help the air flowing around the side pull in and re-attach, kinda like the air flowing over the roof going down to the trunk.

I wonder how much benefit one can get from a stepped down boat tail versus a regular boat tail. Better visibility out the rear window, methinks.

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Old 10-23-2010, 08:23 AM   #43 (permalink)
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Quote:
Originally Posted by SlideWRX View Post
On wings (planes or race cars), side plates effectively extend the wingspan
On aircraft, they are used to eliminate spanwise flow which reduces wing efficiency.
Basically, they keep the air where the designer/engineer wants it - in this case on the most aerodynamically efficient path on the vehicle.

Check out the Ford Bonneville car : it also has strakes on the roof and in front of the extended tailplate on the trunk, while the rear window sits slightly deeper, also creating a fence on the sides.

Quote:
I wonder how much benefit one can get from a stepped down boat tail versus a regular boat tail. Better visibility out the rear window, methinks.
If the angle of the rear window isn't too large and abrupt, just boat-tailing the trunk area will most likely do the trick.
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Old 12-26-2010, 10:50 PM   #44 (permalink)
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After seeing what Piwoslaw, Wyatt, Darin and others have done, I am wondering if I can create something similar for my Dodge RAM QC. Since I swapped the tonneau cover for a topper, I have noticed FE has dropped. I figure a kammback or boattail (boy would THAT be long....) would help drop the drag. Could I take the same basic picture here and apply it to my truck, or do I need to go to that extreme?

Sorry about the hi-jack. Dave

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Originally Posted by cfg83 View Post
3dplane -

*IF* my center-of-camber selection is correct, then I would make the claim that the angle is too steep and the airflow is not staying attached :



I agree with Weather Spotter that a longer kamm-back would be better, but I also think that if you get the angles right, it should still be a net benefit. I think that aerohead had a table of "diminishing returns" of a boat-tail. Obviously a full boat-tail would be best, but pragmatic concerns make it necessary for ecomodders to figure out how far they want to go.

But I'll let the real aero-experts chime in.

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Old 12-27-2010, 01:16 AM   #45 (permalink)
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ECONORAM -

I don't have the answer to your question, but the slope might look something like this (if I have the correct image) :



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Old 12-27-2010, 09:51 AM   #46 (permalink)
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Quote:
Originally Posted by cfg83 View Post
ECONORAM -

I don't have the answer to your question, but the slope might look something like this (if I have the correct image) :



CarloSW2
That looks about right to me. I have seen people just go from cab roof to top of tail gate with good results but following the template is better.
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Old 12-27-2010, 11:14 AM   #47 (permalink)
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Quote:
Originally Posted by cfg83 View Post
ECONORAM -

I don't have the answer to your question, but the slope might look something like this (if I have the correct image) :



CarloSW2
You could do this...
http://ecomodder.com/forum/showthrea...dea-15137.html

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