Mercedes-Benz Concept IAA changes shape with high speed to boost aerodynamics

Article by Christian Andrei, on September 15, 2015

If you find it hard to believe that beauty and power can go together, then the Mercedes-Benz "Concept IAA" (Intelligent Aerodynamic Automobile) might just change your mind. Having recently made its debut at the Frankfurt International Motor Show, the "Concept IAA" has plenty to offer the serious car fan.

The dimensions of the "Concept IAA" include a length of 5040 millimetres (5430 mm in aerodynamic mode), width of 1995 mm, and height of 1305 mm. It has a wheelbase of 2975 mm, and has front/rear track widths that measure 1710 and 1770 mm, respectively.

Its Cd value of 0.19 makes it comparable to the brand’s racing vehicles – one of which is the Mercedes-Benz W 25 that broke records during the 1936 season.

If you look at each of the vehicle segments, chances are it is a Mercedes-Benz vehicle that takes the top spot when it comes to aerodynamics. In fact, the Cd figure of 0.22 recorded by the Mercedes-Benz CLA in 2013 marks an all-time low for the brand as well as among the series production models.

Exterior Design

This four-door coupé has a design that takes your breath away but it’s also the world’s best when it comes to aerodynamics with a Cd value of 0.19. As soon as the vehicle gets to an 80 km/h speed, its multiple elements that make it an aerodynamics icon kick in. Its interior is comparable to how the S-Class and S-Class Coupé are designed.

With its new touch-based features, we get a glimpse of how a business saloon in the future will look. A transformation takes place instantly when the car hits a speed of 80 km/h or simply by pressing on a button. The aerodynamic super powers of the Concept IAA are activated. At the rear, eight segments are extended by up to 390 millimetres.

Next, the front flaps in the front bumper lengthen by 25 mm to the front and 20 mm to the rear. This means that the air flow around the front end and the front wheel arches is improved. The cupping of the Active Rims experiences a change from 55 mm to zero. Meanwhile, the underbody air flow is improved when the louvre in the front bumper is shifted 60 mm to the rear.

Because of its drop shape, aerodynamic advances, and purist design, the four-door "Concept IAA" Coupé Saloon is the perfect combination of aerodynamics and design. Its wheel arches are prominent from the side, exuding elegance and a purist look from its profile.

The show car is sporty but minimalist with a stunning “shark nose.” Even its rear end displays a look that’s traditionalist and precise. Similar to the front grille treatment, the horizontal louvres provide some structure to the rear end’s shape. Its high-tech look is polished further with an illuminated ring that runs around the rear end.

Daimler’s head of design Gordon Wagener said that the 'Concept IAA' is the latest to arrive from its line of visionary concept vehicles. He added that this combo of an “alluring” shape with smart aerodynamics is a product of the brand’s design philosophy.

Interior Design

Its interior is stylishly sporty and is fitted with the newest luxury features. Its colors and the materials it uses present amazing contrasts between aluminium and cut glass and between anthracite and white. In addition, it’s very functional with its elegant curves, flowing lines, touch operations, and top-quality materials. Its steering wheel with a two-spoke design is a step further in the brand’s philosophy.

The horizontal spokes have an open design and are very intricate, lightweight, and elegant. In addition, the steering wheel comes with touch-based operating functions that offer incredible practicality with the use of impeccable ergonomics and its compact size.

It has OFN (Optical Finger Navigation) buttons positioned as clusters in a hovering style similar to the center console’s touchpad, giving the driver an easier time in scrolling through the instrument cluster options.

On the left is the OFN button that controls the display on that side while the right button controls the corresponding side. In this manner, Mercedes-Benz’s philosophy of keeping eyes on the road and the hands on the wheel still applies.


Powering this concept car is a petrol/electric plug-in hybrid drive, which delivers a maximum output of 205 kW (279 hp). With this much power, it can go as fast as 250 km/h (electronically limited). There’s a variation in its electric range and CO2 emissions ratings, depending on what mode it is in during testing.

When the "Concept IAA" is in aerodynamic mode, it delivers an all-electric range of 66 kilometres and has 28 g of CO2 emissions per km. There’s a subtle difference when it’s in design mode, with a 62 km range and CO2 emissions at 31 g per km.

It isn’t yet clear just how the aerodynamic mode benefits actual driving since the current New European Driving Cycle test gives a 2/3 weight to urban driving. Having built a long list of aerodynamically boosted models, Mercedes-Benz takes pride in releasing the "Concept IAA" that’s also perfect for daily use.

Press Release

Mercedes-Benz "Concept IAA" (Intelligent Aerodynamic Automobile): Digital transformer

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 irresistible design. 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 80 km/h, 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 80 km/h, 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.

The "Concept IAA" also offers a look into the future in areas which are not apparent at first glance. The study features Car-to-X technology, for example, which enables the study to communicate with other vehicles or other sources of information. This represents a major advance in helping to avoid accidents, as obstacles or events which are not visible to the vehicle itself can be detected - the "Concept IAA" is able to look around the corner, as it were. With this and its interior and operating concept, the "Concept IAA" also offers a foretaste of the business saloon of the near future.

Exterior design: sensual purity and innovative aerodynamics

With its dynamic basic shape ("drop shape"), elegantly purist overall design and aerodynamic innovations, the four-door "Concept IAA" Coupé Saloon is a symbiosis of design and aerodynamics. The vehicle interprets classic sports car proportions in a modern vein: the long bonnet flows aerodynamically into the compact, set-back greenhouse, whose roof slopes down elegantly towards the rear, ending in an airflow break-away edge.

The vehicle's elegant side view combines a purist, long basic volume with highly pronounced wheel arches. The sporty, minimalist front of the show car boasts a striking "shark nose" profile. Like the front, the show car's rear end also presents a clear-cut and purist appearance. As on the front grille, horizontal louvres lend structure to the shape of the rear end. An illuminated ring running around the rear end adds the finishing touch to the high-tech appearance.

"The 'Concept IAA' continues our series of visionary concept cars," explains Gorden Wagener, Head of Design at Daimler AG. "The symbiosis of alluring forms showcasing intelligent aerodynamics is an expression of our unique Mercedes-Benz design philosophy."

The interior: touch-based operating philosophy

The interior of the "Concept IAA" combines stylish sportiness with modern luxury. The interior continues the design line of the S-Class and S-Class Coupé while providing an idea of what the interior of a business saloon might look like in the near future. The choice of colours and materials conjures up extrovert contrasts between anthracite and white as well as between aluminium and cut glass. Elegantly curved forms, flowing lines, carefully chosen high-quality materials and the touch-based operating philosophy provide for a high level of functionality.

The two-spoke steering wheel is a progressive further development of the Mercedes-Benz steering wheel philosophy. The open structure of its horizontal spokes is highly intricate in design, as a manifestation of intelligent and elegant lightweight construction. The steering wheel also incorporates touch-based operating functions, offering great functionality in the most compact dimensions as a study in perfect ergonomics: OFN (Optical Finger Navigation) buttons, embedded in the clusters in a similar hovering manner as the touchpad in the centre console, enable the driver to scroll through the instrument cluster menus. The OFN button on the left controls the left-hand display, while the button on the right controls the right-hand display. In this way, the "hands on the wheel, eyes on the road" operating philosophy which has been applied by Mercedes-Benz for many years now is implemented in a manner which is at once brilliantly simple and uncompromising.

"Captivatingly sporty lines, fascinating technical solutions: the 'Concept IAA' symbolises the emotional core of Mercedes-Benz: The best or nothing. And it shows in a host of details what our customers can look forward to in future production models," says Ola Källenius, Member of the Board of Management of Daimler AG, Mercedes-Benz Cars Marketing & Sales, summing up the visionary concept.

The "Concept IAA" is 5040 millimetres long (5430 mm in aerodynamic mode), 1995 mm wide and 1305 mm high. Its wheelbase measures 2975 mm, and the front/rear track widths are 1710 and 1770 mm respectively. The concept car is powered by a petrol/electric plug-in hybrid drive with a total output of 205 kW (279 hp). This provides it with a top speed of 250 km/h (electronically limited). CO2 emissions and electric range depend on the mode in which the vehicle is tested: in aerodynamic mode the "Concept IAA" manages an all-electric range of 66 kilometres and emits 28 g CO2 per km. In design mode the range stands at 62 km and CO2 emissions at 31 g per km. As urban driving is accorded a two-thirds weighting in the current New European Driving Cycle (NEDC), the advantage of aerodynamic mode is not revealed as clearly in this test as in real-life driving. Real-life fuel savings are all the greater, however – in keeping with Mercedes-Benz's customer-oriented "Real Life Efficiency" philosophy.

The "Concept IAA" show car forms part of a long line of aerodynamically perfected vehicles from Mercedes-Benz. With a dimensional concept that makes it suitable for everyday use, this four-seater attains a Cd value of 0.19, assuring it of a place in the gallery of record-breaking and racing vehicles such as the Mercedes-Benz W 25 record-breaker of the 1936 season.

At present the models from Mercedes-Benz occupy the top position for aerodynamics in practically every vehicle segment. In 2013 the Mercedes-Benz CLA attained a Cd figure of 0.22 – marking a new all-time low both within the Mercedes-Benz model portfolio and amongst all series production cars.

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