Mercedes EQXX Slippery Drag Coefficient of 0.17

Over long distances on the open road, one of the biggest obstacles to efficiency is staring us in the face – yet we can’t see it. The air may be fresh and inviting, but it wants to hold us in its grasp. Aerodynamic drag can have a big impact on range. On a regular long-distance drive, a typical electric vehicle dedicates almost two-thirds of its battery capacity to cutting its way through the air ahead, which is why the VISON EQXX has an ultra-sleek and slippery drag coefficient of 0.17.

Despite the practical challenges and the compressed timescale, the success of the collaboration is clearly evident in the sophistication and poise of the exterior design. The surfaces of the VISION EQXX run smoothly from the front, developing powerful yet sensual shoulders above the rear wheel arches. This natural flow concludes with a cleanly defined, aerodynamically effective tear-off edge accentuated by a gloss-black end trim, punctuated by the rear light clusters.

Painted in a striking Mercedes-Benz alubeam silver appearance, the body of the VISION EQXX cradles the smooth dome of the greenhouse as it flows elegantly like a water droplet towards the rear. The retractable rear diffuser is a powerful example of the collaboration between design, aerodynamics and engineering – deploying only at higher speeds when the air becomes a considerably tougher opponent. When retracted, it fits seamlessly into the bodywork, preserving the balance, proportions and lightweight aesthetic of the rear end.

However, it presented a significant engineering challenge. Standing toe-to-toe with the laws of physics, the development engineers working on it had to ensure this seemingly simple mechanism ticked a number of boxes. As well as functioning in all conditions, it also had to weigh next-to-nothing and instantly retract in event of a rear-ender.

The VISION EQXX has a number of less visually obvious, but equally important, active and passive aerodynamic details, such as its small frontal area. It is actually less than that of today’s CLA or even the vehicles from smart. And how many would notice that the rear track is 50 millimetres less than at the front? Another is the air curtain air breather at the front bumper. This ingenious layout pairs with the wheel covers to remove almost every last whisper of aerodynamic separation from the front wheels. And while all that is going on, air pathways even guide additional cooling air over the bonnet, opening the cooling shutters if necessary. This reduces the interference drag around the mirrors and lowers overall drag compared with a conventional outlet into the underbody.

Despite its small frontal area, the front of the VISION EQXX packs a big design punch. A band of light above the gloss-black grille with rose-gold highlights flows effortlessly into the energy-efficient headlights, evocative of those from the EQS. Each headlight consists of two star-shaped elements, the larger one housing both the low-beam and high-beam light arrays behind a glossy centre lens. This arrangement, paired with the 2D star pattern on the front bumper, offers a preview of front-end design detailing that will feature in future Mercedes-Benz models.

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