I dunno. At the very least, I think that that is the wrong place to vent. You'll be tripping the air flow coming down the car. I'm guessing, but if you could duct the air into an already turbulent stream, it would probably be better.
__________________ "Jesus didn't bring 'Natty Lite' to the party. He brought the good stuff."
Really? I have just been looking into them recently, and although I have only found 1 or 2 sources on using them 'backwards' as outlets, I haven't found anything that says you can't.
there are more but it seems fairly obvious to me that NACA ducts are directional so like anything that's directional they would function best in the direction intended.
Try driving your car backwards on the interstate, or hammering a nail with the handle of the hammer, or gnipyt sdrawkcab no ruoy draobyek...you get the idea.
The best outlet is one which will allow the exiting airflow to be as close as possible to the direction of the external airflow. In other words, the exit air should be as close as possible to parallel to the direction of travel. It would seem the "backwards" NACA vent would provide a good direction for airflow, but the way it would be causing the air the constrict in the reducing width slot would induce turculence into the exit airflow. A similar design of just a simple rectangle would seem to be better..
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HAHAHA You know that might just work.......
