NACA ducts under X3 by front of rear door!! - XBimmers

GrumpII · 06-09-2011, 06:34 PM

I bought a model of my X3 on EBAY. Underneath it were two NACA scoops. I went and looked under my X3 and they are there. NO openings so they don't work. YOU don't need pictures, go look at your X3.
Bob

rpiopio · 06-09-2011, 07:00 PM

Had to google NACA duct to understand what the heck you're talking about.

http://en.wikipedia.org/wiki/NACA_duct

Want the thrill · 06-09-2011, 07:33 PM

Very cool

Radioactive · 06-09-2011, 07:36 PM

I'm going to beat Lotus 7 to it! Made famous by the 1969 Shelby GT's

Le Chef · 06-09-2011, 07:39 PM

In truth made famous by the Ford GT40.

Radioactive · 06-09-2011, 07:44 PM

Quote:

Originally Posted by Le Chef

In truth made famous by the Ford GT40.

Damn, Ok, then to the mass population!

Radioactive · 06-09-2011, 07:55 PM

1967 Ford GT40 Mk IV #2- McLaren/Donohue Le Mans-

skier219 · 06-09-2011, 08:08 PM

Quote:

Originally Posted by GrumpII

I bought a model of my X3 on EBAY. Underneath it were two NACA scoops. I went and looked under my X3 and they are there. NO openings so they don't work. YOU don't need pictures, go look at your X3.
Bob

Can you take a picture? (and indicate which is the front and rear directions). I work in aerodynamics, and am curious. In recent years, automakers have been paying much more attention to underbody aerodynamics. Most likely they are there to modify the pressure field under the vehicle, or to provide some manner of flow control. Of course, they could be dummy ducts that only get a cutout on certain models or with certain options, but I doubt that.

Lotus7 · 06-10-2011, 06:16 PM

Just inboard of the NACA Ducts that lead nowhere are the sets of (5) louvers in the same lower body panel. It looks like both the "closed" duct and the blank louvers would add some drag, but maybe they actually disrupt flow and reduce drag like the dimples on a golf ball, or possibly reduce the positive pressure build up under the car. Or maybe the guys at the BMW wind tunnel are just having fun with us.

06-09-2011, 06:34 PM	#1
GrumpII New Member Drives: 2011 x3 28i Join Date: Apr 2011 Location: Sunnyvale Posts: 11 iTrader: (0)	NACA ducts under X3 by front of rear door!! I bought a model of my X3 on EBAY. Underneath it were two NACA scoops. I went and looked under my X3 and they are there. NO openings so they don't work. YOU don't need pictures, go look at your X3. Bob
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06-09-2011, 07:36 PM	#4
Radioactive Captain Drives: '11 X3 28i '10 535i '04 325i Join Date: Mar 2011 Location: San Diego Posts: 618 iTrader: (0)	I'm going to beat Lotus 7 to it! Made famous by the 1969 Shelby GT's Attached Images

06-09-2011, 07:55 PM	#7
Radioactive Captain Drives: '11 X3 28i '10 535i '04 325i Join Date: Mar 2011 Location: San Diego Posts: 618 iTrader: (0)	1967 Ford GT40 Mk IV #2- McLaren/Donohue Le Mans- Attached Images

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06-09-2011, 07:00 PM	#2
rpiopio First Lieutenant Drives: 2006 330i, 2011 X3 35i Join Date: May 2006 Location: Bay Area Posts: 368 iTrader: (2) Garage List 2011 BMW X3 [0.00] 2006 330i [0.00]	Had to google NACA duct to understand what the heck you're talking about. http://en.wikipedia.org/wiki/NACA_duct __________________ 2006 330i: Titanium Silver, Black Leatherette, Navigation, European Delivery. 2011 X3 35i, Alpine White, Premium, Technology, Sport Package

06-09-2011, 07:33 PM	#3
Want the thrill Major Drives: X3 35i Join Date: Mar 2011 Location: MI Posts: 1,034 iTrader: (1) Garage List 2011 X3 35i [4.00]	Very cool

06-09-2011, 07:39 PM	#5
Le Chef Banned Drives: BMW X3 35i Join Date: Apr 2011 Location: Chicago Posts: 412 iTrader: (0)	In truth made famous by the Ford GT40.

06-10-2011, 06:16 PM	#9
Lotus7 Major Drives: xxxx Join Date: Dec 2010 Location: xxxx Posts: 1,041 iTrader: (0)	Just inboard of the NACA Ducts that lead nowhere are the sets of (5) louvers in the same lower body panel. It looks like both the "closed" duct and the blank louvers would add some drag, but maybe they actually disrupt flow and reduce drag like the dimples on a golf ball, or possibly reduce the positive pressure build up under the car. Or maybe the guys at the BMW wind tunnel are just having fun with us.