Aerodynamics: Against the wind

Nov 10, 2015
Outstanding fuel consumption figures require great aerodynamic properties. The new C-Class Coupé has the lowest drag coefficient in its segment.
Mercedes-Benz offers the most streamlined cars with the lowest drag coefficients in almost all vehicle categories. The new C-Class Coupé boasts a Cd value of 0.26.
C-Class Coupé
Predecessor
Drag coefficient Cd
0.26
0.27
Frontal area (A), m2
2.18
2.11
Aerodynamic drag Cd x A
0.57
0.57
 
Because the aerodynamic drag is greater than all other driving resistance forces from a speed of about 70 km/h, this top figure of the C-Class Coupé pays off in the form of fuel savings and reductions in CO2 emissions – especially at higher rates of speed such as when driving on the motorway. A reduction in the Cd value by 0.01 points translates into one gramme less of CO2 per km in the driving cycle (NEDC), while it can equate two grammes in averaged real-world consumption and actually as much as five grammes of CO2 per kilometre at 150 km/h.
Intensive detail work for Cd benchmark
The aerodynamics engineers achieved the Cd value of the C-Class Coupé with an extensive bundle of measures. They include:
  • aerodynamically designed front and rear bumpers
  • aerodynamic wheel spoilers, at the front with 3-D shape and auxiliary spoiler on the front engine bay shroud
  • sealing between wheel arches and engine compartment
  • aerodynamically designed exterior mirrors with mirror base
  • sealing around headlamps and aero lip in the gap between the bonnet and the front bumper
  • Improved sealing of the radiator section and flow properties to make efficient use of the available cooling air
  • spoiler modelled on the boot lid
  • aerodynamically optimised underbody with extensive engine compartment and underbody panelling
  • aerodynamically optimised wheels and tyres
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