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Live talk about the design and aerodynamics of the Mercedes CLA: an interview with Wagener and Woll

Geneva Motor Show 2020
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A Also the questions from our readers that we have had in the last few days were answered by the Mercedes men. You couldn't be there live? Here you can call up our live talk again in peace and quiet.

With the new Mercedes CLA, Mercedes is setting a new benchmark in terms of aerodynamics. As the 180 Blue Efficiency Edition, the CLA has a drag coefficient of 0.22 - the lowest value for a production model.

Mercedes invests in a new wind tunnel

Today, when developing new cars, reducing consumption is a priority in the engineering specifications . Aerodynamics play a key role here. Mercedes, who has been a pioneer in the discipline of designing particularly streamlined cars for years, would like to expand this core competence.

An improvement in the drag coefficient by 0.01 means one gram less CO2 emissions per kilometer. Anyone who uses average real fuel consumption as a basis instead of the standardized driving cycle (NEDC) comes to 2 grams of CO2 per kilometer, and at a speed of 150 km /h even 5 grams of CO2. Dr. Teddy Woll, Head of Aerodynamics at Mercedes-Benz: 'If you succeed in reducing the drag coefficient by ten thousandths, the average customer fuel consumption will drop by a tenth of a liter, and at very high freeway speeds by up to 0.4 liters per 100 kilometers To achieve this saving effect through lightweight construction measures, the cars would have to be slimmed down by at least 35 kilograms. '

Not only the drag coefficient is important for the Aerodynamics important

However, the drag coefficient is not the only decisive factor for optimal wind slippage. The frontal area as well as the air resistance, the product of the air resistance coefficient and the frontal area, are decisive for the aerodynamics and thus the lower consumption. In the Mercedes CLA, the frontal area in square meters is 2.21, the air resistance is 0.49 m2. For comparison, the A-Class has a drag coefficient of 0.26, a frontal area of ​​2.20 m2 and an air resistance of 0.572 m2.

But it is not just consumption that is the focus of optimal aerodynamics. In addition, the lift and thus also the driving behavior should be reduced or improved, especially at higher speeds.

Less window dirt thanks to optimized aerodynamics

Furthermore, Mercedes also wants oneImproved aerodynamics Minimize wind noise, for example on exterior mirrors or the transition from the bonnet to the windshield. And last but not least, the guided air flow also leads to less contamination of the side windows and exterior mirrors, which then continue to offer a clear view in bad weather.

In order to further advance the development of aerodynamically optimized vehicles, Mercedes is investing a high double-digit million amount in a new wind tunnel that is to go into operation in the summer.


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