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Old 12-18-2013, 11:22 AM   #211 (permalink)
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Originally Posted by California98Civic View Post
These are great Kach22i... these days you're adding many that really catch my attention. Thanks.
My pleasure.

It's reassuring to know someone else is enjoying these images from time to time.

http://www.worldcarfans.com/11010032...ica/highphotos

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Old 12-18-2013, 12:19 PM   #212 (permalink)
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These are great photos, love it. I "wish" in some of these Wind Tunnel photos they would use more smoke trails so we could see how the flow over the roof interacted with the flow along the sides. It seems the car companies always show one line of smoke hitting the mid grill area or higher, and then it's line over the roof to show what "Wonderful" aero their car has.
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Old 12-18-2013, 01:25 PM   #213 (permalink)
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Originally Posted by CFECO View Post
These are great photos, love it. I "wish" in some of these Wind Tunnel photos they would use more smoke trails so we could see how the flow over the roof interacted with the flow along the sides. It seems the car companies always show one line of smoke hitting the mid grill area or higher, and then it's line over the roof to show what "Wonderful" aero their car has.
I agree, which is why the below recently posted image is so rare a find.

A prototype 1980 Mercedes 126-body S-Class undergoing wind tunnel testing during 1979.
1980 Mercedes S Class wind tunnel b | CLASSIC CARS TODAY ONLINE


A 3/4 view from the rear would be nice to add to this.
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Old 12-18-2013, 02:59 PM   #214 (permalink)
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..and a view from above. It looks like the flow over the Right side of the grill goes around the right side of the car but the one over the Left side goes over the roof...? But there is two different points where the smoke was started on the Left side of the grill area that kind of combine into one.
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Old 12-18-2013, 05:40 PM   #215 (permalink)
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And another image, just to illustrate how useless that smoke trails are to all but the experts :

Just look at how streamlined James Mays' face is !

not
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Old 12-18-2013, 07:19 PM   #216 (permalink)
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Quote:
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And another image, just to illustrate how useless that smoke trails are to all but the experts :
One thing I don't like is that the smoke streams expand and dissipate by the time they get to the rear of the car.

SRT Viper | Speed-Wars

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2013 SRT Viper hypercar doing aerodynamic testing in the Wind Tunnel
Note: the intakes and vents prove the importance of cooling air going through the car too.
Race Tech in a Wind Tunnel for Bonneville and Drag Racing | MyRideisMe.com



Corvette Wind Tunnel Testing Photo 6


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1977 Porsche 911s Targa
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Chin Spoiler:
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Rear Spoiler Pick Up Truck
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Roof Wing
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Old 12-20-2013, 04:07 PM   #217 (permalink)
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It looks like.....

Quote:
Originally Posted by CFECO View Post
..and a view from above. It looks like the flow over the Right side of the grill goes around the right side of the car but the one over the Left side goes over the roof...? But there is two different points where the smoke was started on the Left side of the grill area that kind of combine into one.
When looking at the enlarged image,it seems like they did a time-lapse photo with the smoke wand in four different positions,and not necessarily symmetrical to one another,side to side.
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Old 12-20-2013, 09:33 PM   #218 (permalink)
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aerohead...yes I saw that. Boy if they would do that on a grid pattern all across the front, ground level to the roof line.....then we'd really see the whole "picture".
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Old 12-21-2013, 12:20 AM   #219 (permalink)
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It's reassuring to know someone else is enjoying these images from time to time.
Fear not. I just can't think of something stupid to say each time.

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Old 12-21-2013, 04:20 AM   #220 (permalink)
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Test me.

What I see in post #219 and third image in post #216 is the smoke loosing all definition in the flow, becoming one hazy cloud adjacent to the body. In post 219, I'm assuming this effect reflects the higher pressures at the front of the roof that then drop as we move aft. And in the thrid image in post 216 it might be a similar presure effect compounded by the turbulence created by the front wheel well.

Assuming I'm in the general ballpark of understanding these images, post 219's image, which seems to be unusually close to the template ideal at the front end and along the roof line, suggests strongly the limits of front end aero. Won't the wake on this body be quite large without boat tailing?

Also, the third image in post 216 suggests that a skirt on the rear wheel wells will have much less benefit without front wheel well skirts, yes? Expect turbulence.

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