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kach22i 08-14-2013 11:42 AM

Random Wind Tunnel and Smoke Pictures Thread
There is something reassuring and comforting about wind tunnel and smoke pictures, at least for me.

Post them if you have them.

Mercedes-Benz-Blog: The new Mercedes-Benz E-Class Cabriolet - TecDay Aerodynamic 2009 - PART X

Dodge - 2010 Ram 1500 - Design - Best In Class Aerodynamics

100 Year-Old Aerodynamics Problem Solved: Could Increase MPG Dramatically
By Ovidiu Sandru ..............September 27, 2008
100 Year-Old Aerodynamics Problem Solved: Could Increase MPG Dramatically - The Green Optimistic

MIT researchers discovered the solution to a problem put 100 years ago by Ludwig Prandtl. It refers to the situation when, for example, a car accelerates up and down a hill, then slows to follow a turn, and the airflow around it cannot keep up and separates from it. This aerodynamic phenomena creates an additional drag, slowing the car, and forcing you to push harder on the pedal, consuming more gas. The same applies to airplanes, boats, subs, and generally, any moving object following the rule mentioned above.
Around 50 images in this thread alone:
Car Wind Tunnel Data

Cd 08-14-2013 12:54 PM

Fantastic idea ! I hope this gets pinned.

By the way, that Dodge has the smoke PhotoShopped in. ( They wish it looked that good ! )

It is much closer to this Ford :

spacemanspif 08-14-2013 02:49 PM

A2WT HomePage. They are a wind tunnel that anyone can use (assuming you are willing to pay for the time) to test their cars. Many pictures and vids on their websites. Most cars aren't small eco-boxes like our but you can watch the videos and see how things really help or hurt aero.

bondo 08-14-2013 04:12 PM

A2 Wind Tunnel
1 Attachment(s)
Nice tunnel with a great crew. In the picture below is Dave Salazar the General Manager. He is an Aero Engineer and he has forgotten more than I will ever know. They have two tunnels there, the smaller A2 tunnel (which I could afford) and a much larger tunnel NASCAR uses adjacent to it which gets pricy quick.

One problem with wind tunnel testing a large vehicle in a wind tunnel with a small cross section, is that the final Cd number may be skewed due to the compression of the air between the walls of the constricted test chamber and the large frontal area of a vehicle like a full size truck. Best to test a small car in the A2.

It is fun to watch the smoke though!


kach22i 08-14-2013 04:54 PM

1 Attachment(s)

Originally Posted by spacemanspif (Post 385166)

Interesting video.

Got me to wondering about that VW wind tunnel with a rotating turntable base to simulate crosswinds. When I have the time I'll post something on that.

RE: Photoshop Dodge truck smoke.

They fooled me, I hate when that happens. Proves once again that you cannot trust everything you see on the Internet.

Random pictures, like the thread title says:

Cd 08-14-2013 05:06 PM

kach22i : Would it be all right with you if we also post tuft tests here as well ?

Unless you really know what to look for, I'm guessing most of us can't see turbulence with smoke testing as easily as you can with tuft testing.

With tuft tests, you can literally see the pockets of air that are causing problems and the direction of the airflow.

Cd 08-14-2013 05:09 PM

Turbulence !

Cd 08-14-2013 05:14 PM

By looking at the smoke stream, it looks as if the wind speed here is moving at a crawl.

I think GM doesn't wan't to show how bad that the drag is on the new Camaro. And note that this only shows the roofline. I'd like to see them test near that open grille.
Aero disaster !

Cd 08-14-2013 05:16 PM

Cd 08-14-2013 05:20 PM

kach22i 08-15-2013 09:24 AM


Originally Posted by Cd (Post 385191) tuft tests here as well ?

By all means, the more perspective on the issues the better.

For me tufts seem less intuitive, requiring intense examination and analysis when compare to smoke which just seems to flow effortlessly.

Ignorance is bliss?

kach22i 08-15-2013 09:30 AM

AutoSpeed - Aero Testing - Part 5

AutoSpeed - Aero Testing - Part 4

Cd 08-15-2013 11:33 AM

A smoke stream would make this car look sleek, but the telltale tufts show just how much of a mess the car is to the air :

kach22i 08-16-2013 08:34 AM


Originally Posted by Cd (Post 385360)
A smoke stream would make this car look sleek, but the telltale tufts show just how much of a mess the car is to the air : [/IMG]

That's just gotta be a cross-wind test, at least I hope so.:eek:

New Gas Mileage Rules Will Reshape What Americans Drive: Aerodynamics And Weight
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Wind tunnel testing the MINI Cooper John Cooper Works GP

kach22i 08-19-2013 12:01 PM

I assume this shape has been in a few wind tunnels before - so it qualifies.

Project Heinkel: Volkswagen - Origin of the world beating 'People's Car'

One of Jaray's wind tunnel maquettes. This shape would form the basis of his car design patents.
streamliners and teardroppers | Hemmings Daily

Up for consideration were a few million dollars’ worth of classic Benzes from the 1950s: a 1952 W194 300 SL race car, a 1954 W198 300 SL production car and a 1951 W188 300S coupe. The results were interesting. The race car weighed in with a drag coefficient of .376 (wind speed 80.77 MPH) the production 300 SL was a close second at .389 while the 300S had a drag coefficient of .670.

* David Greenlees over at The Old Motor this week showed us an early approach to wind tunnel testing, using scales to measure the various forces on the car.

kach22i 08-19-2013 12:18 PM

Project Heinkel

Tufts are typically suitable for showing large to medium size flow field structures, depending on size of the tufts relative to the model. The easy installation also makes it a useful "quick-and-dirty" tool. Unlike the sublimation methods, tufts stay constantly active and is therefore suitable for wide slow sweeps, studying for example the conditions for stall.

aerohead 08-19-2013 06:54 PM

Jaray model
This is the 'pumpkin seed' of which the Aerodynamic Streamlining Template is derived.Jaray derived his from a Cd 0.045 streamline body of revolution/airship form.Wolfgang Klemperer,who had his graduate degree in engineering in 1922 did the wind tunnel measurements for Jaray at the Zeppelin works of which they both worked.It measured Cd 0.13 in its 'best' edge configuration with wheels,on the 'ground.'
I used a Cd 0.04 body for the 'Template.'

kach22i 08-19-2013 07:47 PM


Originally Posted by aerohead (Post 386170)
This is the 'pumpkin seed' of which the Aerodynamic Streamlining Template is derived.

I admit to getting a little excited when I first found the image today. I knew right away what it was, yet have never seen a photo of the model before.

More on it in Portuguese, use Google Chrome as your browser and it will translate it for you.
Maybach - Paul Jaray e a aerodinâmica - Um olhar sobre as corridas
Photo Caption:

"The ideal way Jaray applied to a body close to the ground" in 1920
ETH Library, History of Science Collection, Zurich, Switzerland
More random wind tunnel and tuft pictures.

Tatra T600 Tatraplan

Wind tunnel - Newton lab. - Tests, Certifications, Wind tunnel, Interlaboratory, Ballistic test, Helmet testing

NeilBlanchard 08-20-2013 08:50 AM

kach22i 08-20-2013 11:03 AM

One from your own collection, thanks Neil.
Schlor Pillbug Photos by NeilBlanchard | Photobucket

Some more on that car.


euromodder 08-20-2013 01:10 PM


Originally Posted by kach22i (Post 386093)

Clear to see where the early Porsches and original Saabs came from :rolleyes:

NeilBlanchard 08-20-2013 10:58 PM

George, that is a picture of the Schlörwagen I have not seen before, and it seems to be only available in that tiny Flash slideshow... :( No tufts on it, either.

kach22i 08-30-2013 01:48 PM

Gregg Fraley, Creativity & Innovation Consultant, Professional Speaker. Idea generation training and new product development | 2013-ats-sedan-performance-aerodynamic-design-video-960×540

Pictures: A Rare Look Inside Carmakers' Drive for 55 MPG

Mercedes-Benz Aerodynamics: Emotion meets efficiency
By Adrian-Liviu Dorofte at Friday, February 15, 2013
Mercedes-Benz-Blog: Mercedes-Benz Aerodynamics: Emotion meets efficiency

freebeard 08-31-2013 02:29 AM

When I saw you had posted I expected it would be this one, so yay me:
There's a slide show, 4 of 5 on-topic.

kach22i 09-01-2013 12:42 PM


Originally Posted by freebeard (Post 388094)

We have talked about this car before, but I don't recall ever seen wind tunnel and smoke pictures of it before.

Does this last image indicate that attachment os air flow is not everything?

Seems to look like the air knows what to do and is not tumbling away in a disruptive manner.

EDIT-1: The wheels do not seem to be turning in the wind tunnel photos, therefore the draw of the engine fan does not seem to be entering the equation. Making the air flow even more flattering for this design, or less so?

The messy air and pressure discharge under the car's engine bay would undo any gains topside though the rear engine intake?

freebeard 09-01-2013 02:38 PM

I was going to say it indicates an engine starved for air. :) But you are [apparently] right.

Most all of the pictures with smoke streaming the length of the vehicle show that orderly detachment. I'd like to see the smoke applied from the rear as so:
I didn't look at the pics a lot, I was mainly interested in the list of cars that have a higher Cd today. The only thing that tops it is the VW LX1 and it's a tandem 2-seater.

We have talked about this car before...
:) It's my favorite car. In 1974 when everyone started re-popping MG-TDs and Ford GT40s in fiberglass to drop onto the endless supply of VW chassis, it was sitting in a museum in France. The Amante was about as good as it got in that market.
If things had gone a little differently it would be as iconic a shape as the 911 and you could get them in a carbon fiber/titanium mesh today.

I'd like to see the cut line in back go more like this:
With an electic motor, you wouldn't have to worry about fumes seeping forward.

Bu, like you, I would really like to see the underside to see how Volkhart handled the airflow around the engine and exhaust.

kach22i 09-01-2013 08:12 PM

2005 Pagani Zonda F - Wind Tunnel - 1600x1200 Wallpaper

2005-Pagani-Zonda-F-S-Wind-Tunnel-1600×1200 - New Cars, Used Cars, Car Reviews, Car Finance Advice, Affordable Cars in Nigeria – Wonderwheels Automobiles

Pagani Zonda S windtunnel | HD Car wallpapers

euromodder 09-02-2013 08:49 AM

A lot of windtunnel pics that make it into the sales brochures & advertising, are doctored pics ...

Look at the real Zonda tunnel pics, and the cleaned side view ... reality isn't anywhere that clean.

kach22i 09-02-2013 08:21 PM

The Rumpler’s shape was very aerodynamic, but it was also quite tall and boxy, which resulted in the one hundred or so production cars being used primarily as taxis puttering around Berlin because of their roomy minivan-like bodies.
Mercedes-Benz Classic Home - The Mercedes-Benz S-Class tradition - Aerodynamics

Aerodynamics - Tech - European Car Magazine

Aerodynamics Mercedes Clk Rear Right Window Photo 4

kach22i 09-02-2013 08:39 PM

The “large wind tunnel” in Untertürkheim | Mercedes-Benz Passion eBlog

It was mentioned above that underfloor drag is responsible for about one-third of the total drag of a current car. The other proportions are also easy to remember – about one-third for all the exterior surfaces and the last third caused by airflow required for engine cooling. (See Modifying Under-Car Airflow, Part 1.)

kach22i 09-02-2013 08:49 PM

Styling, fins, aerodynamics, and the Dart concept car

The tests demonstrated that the design of our 1957 model cars exerts a stabilizing effect much as do the tail fins on airplanes and "unlimited class" power boats. With the high upswept fins of our 1957 models, tests showed that road-holding stability was improved, reducing steering correction by as much as 20 percent in strong cross winds at normal highway driving speeds.

Original is at Styling, fins, aerodynamics, and the Dart concept car Styling, fins, aerodynamics, and the Dart concept car
Follow us: @allparcom on Twitter | allparcom on Facebook
.................................................. .....................


The most important results: the 300 SL (W 194 series) racing car has a drag coefficient cD = 0.376. It is thus around 20 per cent better – that is, considerably better – than its contemporary comparison vehicle, the 300 S (W 188 series), for which a value of cD = 0.462 was obtained. This result underscores the efforts of the engineers and designers back then to attain a low drag coefficient as an important prerequisite for the SL’s racing success – which the car then went on to achieve in the course of the 1952 racing season at different international motorsport events, for example at Le Mans or in the Carrera Panamericana in Mexico. The 300 SL (W 198 I) series-production sports car returned a drag coefficient value of cD = 0.389.

.............................At the same time the results of the measurements showed how far from reality was the drag coefficient cD = 0.25 value determined in the 1950s with a 1-in-5 clay scale model of the W 194 – and how great an influence, for example, the air flow through the engine compartment (which of course the clay model did not have) has on the overall air resistance of the car.

kach22i 09-03-2013 04:31 PM

Glass Wind Tunnel by bryan welcel from usa
Glass Wind Tunnel - designboom | architecture & design magazine

kach22i 09-03-2013 04:32 PM

Don’t lower your tailgate: GM details aerodynamic design of 2014 Silverado and Sierra, debunks myths | Equipment World | Construction Equipment, News and Information | Heavy Construction Equipment

kach22i 09-03-2013 04:40 PM

Commute Cars -

Wind Maker

MIT Solar Car - Massachusetts Institute of Technology solar car shines |

Luminos -- Stanford's Solar Car | CleanTechnica

UM System Curators Approve State Street S&T Wind Tunnel

freebeard 09-04-2013 03:15 AM

Does this mean you've posted all the wind tunnel smoke pictures on Internet? I've been wondering how long you'd keep that run going.

arcosine 09-04-2013 07:36 AM

1/8 scale model:;pageNum=37

kach22i 09-04-2013 11:36 AM


Originally Posted by freebeard (Post 388703)
Does this mean you've posted all the wind tunnel smoke pictures on Internet? I've been wondering how long you'd keep that run going.

Naw, I'm sure there will always be more, the Internet is not stagnate.

Tufts are allowed in the thread, so are any other vehicle types of interest.

The forum has so many other threads in which tuft and smoke images are posted, maybe it's a good time to corral them all here?

Wool Tuft test

Aero Testing the Mopar Missile

AutoSpeed - Aero Testing - Part 1

Smoke and Tuft Flow Visualization

Beetle Aerodynamics / Roofspoiler

Human Power Team Delft & Amsterdam - The path of Velox 2 aerodynamics

kach22i 09-04-2013 11:38 AM

Water testing too.............why not?

AutoSpeed - Aero Testing - Part 4

Many 'aware' drivers - when considering their car's aerodynamics - watch the patterns that raindrops make on their car bodies. However, the behaviour of water drops and air is usually very different - the water has greater mass, surface tension and so on. 'Rain' testing is carried out in wind tunnels to assess the effectiveness of wipers and to optimise dirt deposition so that it doesn't obscure head- and tail-lights or driver vision through side windows.

Cd 09-04-2013 12:42 PM

Aero Warriors - The G-Series Wind Tunnel Test Report Figures In Thumbnail Format

kach22i 09-04-2013 01:29 PM

Figure 146 does not look like any 1971 Dodge I've ever seen, not even in racing form.

Very interesting find.

I bet Richard Petty would have loved to have lost that concave rear window for a convex one.

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