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Old 12-10-2007, 09:54 PM   #1
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Since Ben brought up that the pic existed in the hood thread, I had to find it. Granted it is for a NB and there is no designation about what speed it was tested at, it at least gives us some insight into airflow. I figured that I'd post it here for reference.

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Old 12-10-2007, 10:10 PM   #2
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Sorry, I knew it was of the NB, and should have mentioned that. NA and NB are close enough I think for this purpose though.
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Old 12-10-2007, 10:11 PM   #3
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it appears that the first half of the hood sees the biggest pressure therefore being the best place for an opening
or am i completely wrong?
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Old 12-10-2007, 10:20 PM   #4
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Quote:
Originally Posted by whaaamx5 View Post
it appears that the first half of the hood sees the biggest pressure therefore being the best place for an opening
or am i completely wrong?
Actually, I should have been more clear in my description. The diagram shows air velocity not pressure. So red would be higher velocity airflow and green/blue lower velocity airflow. Which is why in theory placing a vent toward the front of the hood "should" be a good location for an extraction vent as typically higher velocity should mean lower pressure and why the back of the hood "should" be a good location for a cowl intake as it is a low velocity/higher pressure area. As another example, note the nice low flow/pressure area right where a windblocker usually makes a difference. BUT, again, this can change based on airspeed and the pic did not have any indication of airspeed.
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Old 12-10-2007, 11:33 PM   #5
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So does this mean I can drive in the rain with the top down and not get wet?
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Old 12-10-2007, 11:34 PM   #6
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I wonder how much of a difference a hardtop makes?

Also it seems that you would need a pretty tall rear wing in order for it to see any "clean" airflow.
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Old 12-10-2007, 11:45 PM   #7
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Do you have a version of this with the top up?
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Old 12-11-2007, 12:04 AM   #8
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driving in the rain with the top down at 65mph results in very little wetness..... maybe a few drops...
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Old 12-11-2007, 12:32 AM   #9
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Quote:
Originally Posted by brgracer View Post
Actually, I should have been more clear in my description. The diagram shows air velocity not pressure. So red would be higher velocity airflow and green/blue lower velocity airflow. Which is why in theory placing a vent toward the front of the hood "should" be a good location for an extraction vent as typically higher velocity should mean lower pressure and why the back of the hood "should" be a good location for a cowl intake as it is a low velocity/higher pressure area. As another example, note the nice low flow/pressure area right where a windblocker usually makes a difference. BUT, again, this can change based on airspeed and the pic did not have any indication of airspeed.
gotcha, we are on the same page
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Old 12-11-2007, 12:37 AM   #10
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Needs more NA w/ hardtop.

-Mike
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Old 12-11-2007, 01:03 AM   #11
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This might not have anything to do with actual aerodynamics, but I'm trying to talk autokonexion into making NA mazdaspeed Type II side skirt replicas. They look so hawt.
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Old 12-11-2007, 09:50 AM   #12
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pic?
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Old 12-11-2007, 10:47 AM   #13
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Go the m.net and look in the dyno section for the 28rs dyno on a 1.8. The guys 2nd post has a pic of his red car with them. They are one of the only oem side skirts made for the NA. I don't think they were ever released in the US though, and have been discontinued for a while. Only good looking skirts IMO.
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Old 12-11-2007, 11:41 AM   #14
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haha does anyone have the legend for this?

(this picture is in a (my) fluid mechanics text book, and never had any legends that i could find)
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Old 12-11-2007, 12:22 PM   #15
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red = fast, blue = slow. Things like this just follow the order of colors.
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Old 12-11-2007, 12:33 PM   #16
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Sorry no hardtop version and no legend. I am sure that the colors indicate airspeed and not pressure as the original file was named wind velocity or something of that sort. No other versions. It was a file that RodH found on some site in the UK with no other leads.
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Old 12-11-2007, 12:35 PM   #17
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Quote:
Originally Posted by neogenesis2004 View Post
red = fast, blue = slow. Things like this just follow the order of colors.
wow, helpful.

Red=100000000 mph
Blue= absolute 0
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Old 12-11-2007, 12:37 PM   #18
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Quote:
Originally Posted by Loki047 View Post
wow, helpful.

Red=100000000 mph
Blue= absolute 0
Again, sorry, no legend. There wasn't even an annotation of what windspeed the test was done at. FWIW, this is pretty much what we have unless anyone has access to a windtunnel.
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Old 12-11-2007, 12:38 PM   #19
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On no brgracer, i appreciate the effort to get he picture an everything, that was for neo, for his explanation
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Old 12-11-2007, 12:45 PM   #20
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Here you go Ben
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Miata Aero-dsc02168s.jpg  
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