Stuttgart, Feb 07, 2007
Two Mercedes patents that bring significant aerodynamic advantages are being used in the new C-Class for the very first time. Mercedes engineers have invented innovative "ventilated tail lights" which replace conventional spoiler lips. To keep the rear window clean even in heavy rain, and ensure that the driver has a clear view to the rear, the specialists in Sindelfingen have a developed a twin rubber drainage channel in which the rainwater is collected and conducted away to the sides by the slipstream.

With a Cd value of 0.27, the new C-Class is the most aerodynamically efficient notchback saloon in its market segment. This is made possible by a number of intelligent details which measurably reduce the air resistance, and therefore fuel consumption. The innovative tail lights with ventilating slits are a good example. These replace conventional spoiler lips and therefore do not compromise the attractive rear-end design of the saloon. This technology was newly developed by Mercedes engineers and has been patented.

When the C-Class is on the move, air is sucked in from the underbody and is conducted behind the tail lights to flow out of the small ventilating slits in the lenses. As the tail lights are hermetically sealed against the vehicle body, the air is only able to escape to the side via the ventilating slits. In this way the aerodynamic specialists are able to influence the air flow along the side walls by abruptly redirecting it at the tail lights.

Without this sophisticated aerodynamic feature, the slipstream would be conducted behind the rear end of the saloon at the tail lights, causing unfavourable turbulences which negatively affect the air resistance, rear axle lift and yaw characteristics. This is prevented by the "ventilated tail lights" of the new C-Class.

Rubber drainage lip on the rear window: rainwater is sucked away

In addition to reducing the coefficient of drag during their wind tunnel tests, the aerodynamics experts at Mercedes-Benz take care to ensure that the exterior mirrors, side windows and rear window remain clear in rainy conditions, giving the driver unimpeded all-round visibility. Owing to the special air pressure distribution in the rear roof area of the C-Class, a new Mercedes patent is used here for the first time: a two-piece rubber lip as a transition between the roof and the rear window. This features an open channel and a partly enclosed channel. Owing to the pressure conditions at the rear edge of the vehicle roof, rainwater first runs towards the middle in the open channel, where suction draws it outwards. Via the enclosed channels in the rubber lip, it then flows away downwards along the window edging, keeping the window clean even at high speeds.

Amazing stuff from MB..
as always on edge..

I love the fact MB & BMW (specially designed sides of roof spoiler on E70 X5) have finally started to use F1 aerodynamics experience on their production vehicles.

Less Drag And Better Visibility: New Mercedes C-Class Adds Two New Patented Technologies To Improve Aerodynamics

When the 2008 Mercedes C-Class hits the market later this year, featured on it will be two patented new components that bring "significant aerodynamic advantages" to the new model, both of which help make the C the most "aerodynamically efficient notchback saloon in its market segment."

The first technology, ventilated tail lights, have been implemented to replace conventional spoiler lips and help direct air flow along the side of the vehicle. The lights, which are hermetically sealed against the vehicle, function by taking air sucked from the underbody and forcing it through ventilating slits. Without them, the slipstream would be conducted behind the rear of the vehicle at the tail lights, resulting in unfavorable turbulences which negatively impact air resistance, rear axle lift and yaw characteristics.

The second technology pioneered by Mercedes' aerodynamics experts and fitted on the new C-Class is a two-piece rubber lip which serves as a transition between the roof and the rear window. Featuring an open channel and a partly-closed channel, the rubber lip in combination with the roof's air pressure distribution functions by sucking rainwater first into the open channel and then diverting it to the partly-closed channel, allowing it to flow downward along the window edging. As a result, rear window visibility in poor weather conditions is greatly increased, even at high speeds.

If you'd like to learn more about either of the two aforementioned technologies, we encourage you to do so. Keep reading for the official press release, which describes in even greater depth the 2008 C-Class' ventilated tail lights and rubber drainage lip.

Read the Press Release here

Interesting idea

i wonder if the car makes enough downforce for the AMG modell
or it might have a lip or a wing..

This goes back to the days of when cars like the W126 had ribbed taillights in order to keep them clean by using air to brush away rainwater and dirt.

M

Didn't BMW add some kind of small "wings" inside the fenders behind the wheels when the engineers noticed that it reduced noise noticeably?

Did you know that these rims:



Were aerodynamically designed to allow air to cool the brakes? Just a little something from MB I thought was appropriate for this topic.