Mercedes-Benz Concept IAA revealed with a Cd value of 0.19

The Mercedes-Benz “Concept IAA” (Intelligent Aerodynamic Automobile) is two cars in one: an aerodynamics world champion with a Cd value of 0.19 and a four-door coupé embodying futuristic luxury design.

Power comes from a petrol-electric hybrid system producing 274bhp, good for a top speed of 155 mph, while CO2 emissions are only 28 g/km. All-electric range is said to be up to 20 miles.

The study, which is celebrating its world premiere at the Frankfurt International Motor Show, switches automatically from design mode to aerodynamic mode when the vehicle reaches a speed of 50 mph, whereby numerous aerodynamics measures alter the shape of the vehicle. Inside, the “Concept IAA” continues the design line of the S-Class and S-Class Coupé, offers new touch-based functions and provides an idea of what the interior of a business saloon might look like in the near future.

At the touch of a button, or automatically on reaching a speed of 50 mph, the Mercedes-Benz “Concept IAA” (Intelligent Aerodynamic Automobile) performs a fascinating transformation in which the captivatingly beautiful four-door coupé turns into an aerodynamics world champion: eight segments extend at the rear, increasing its length by up to 390 millimetres; front flaps in the front bumper extend by 25 mm to the front and 20 mm to the rear, improving the air flow around the front end and the front wheel arches; the Active Rims alter their cupping from 55 mm to zero; and the louvre in the front bumper moves 60 mm to the rear, improving the underbody air flow.

“Fascinating and technically sophisticated cars form the core of Mercedes-Benz. The ‘Concept IAA’ applies intelligent innovations to resolve the conflicting aims of functionality and aesthetics and shows that we still have plenty of ideas on how to achieve further improvements in efficiency,” says Prof. Dr Thomas Weber, Member of the Daimler Board of Management responsible for Group Research and Head of Mercedes-Benz Cars Development.

Equally, the “Concept IAA” exemplifies the fundamental technological changes which are taking place in the automobile industry. The primary driving force behind this process of change is digitisation – commonly referred to in a business context as “Industry 4.0”. For Mercedes-Benz, a continuous digital process chain from research and development through production to marketing and sales, logistics and the service area is already becoming reality.

The design and aerodynamic shaping of the “Concept IAA” would not have been possible without the systematic digital networking of different specialist departments. The designers have employed the latest algorithmic design methods to handle the complex geometric design. The individually adapted software enables dynamic design in three-dimensional space. This dynamic modelling makes it possible to display and model different states simultaneously. The resultant highly complex geometries were turned into reality with the aid of innovative production technologies (rapid prototyping).

The world-beating aerodynamics were developed in parallel with the aid of numeric flow simulation. In around one million CPU hours, the aerodynamics experts from Mercedes-Benz simulated the flow characteristics, calculating some 300 variants. This roughly corresponds to the scope of work involved in developing a production model.

Mercedes-Benz Concept IAA

Mercedes-Benz Concept IAA 2

Mercedes-Benz Concept IAA 4

Mercedes-Benz Concept IAA 5

Mercedes-Benz Concept IAA 6

Mercedes-Benz Concept IAA 7

Mercedes-Benz Concept IAA 8


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