Thread: New air dam
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Old 02-09-2017, 10:19 AM   #10 (permalink)
kach22i
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Quote:
Originally Posted by JRMichler View Post
My guess is that a lot of air is coming up from underneath the new air dam.
Quote:
Originally Posted by kingster1989 View Post
Looking at this picture reminds me of those wind tunnel tests of a box trailer and the air just swirls at the back, it may be doing so here in a similar fashion.
I'm wondering if a small splitter would be enough to establish a "plane".

This plate splitter or plane would not only split air at the leading edge but provide a clean edge from which the air could release from.

https://robrobinette.com/S2000Aerodynamics.htm

Quote:
Note how the high pressure (red) bubble sits on top of the splitter adding downforce. The underside of the splitter also generates low pressure (blue) and downforce but the splitter needs to be lower than about 3 inches to generate this low pressure area.
Rebel Front Splitter Insert GB - Cobalt SS Network

Quote:
Not only will this help stability but it will also help cooling by forcing more air to go through the rads.
Follow the links provided above for proper context, I did not want to Copy & Paste an excessive amount.

EDIT: I sketched up what I think is happening.

Aerodynamics by George Kachadoorian | Photobucket


I would not make it like my splitter, which was an outer lip only - you need a to establish a parallel plane to the ground because your stepped up backer is a step up, and is drawing the air up to fill the vacuum.

Chin Spolier - fast/easy/cheap/effective - Page 2 - Pelican Parts Technical BBS


I have no internal step up on mine shown above, which is maybe why I got away with my design. Yours needs to be different because yours is different.

In other words:
You built an upside down Gurney flap!
(without the splitter/rear deck trunk/wing part)

The chin spoiler is the Gurney flap, second flap is the internal bracing.

http://blog.octanenation.com/kubica-...-thanksgiving/
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Last edited by kach22i; 02-09-2017 at 11:18 AM..
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