The wind tunnel in Untertürkheim has been used by Mercedes-Benz developers for eighty years. Thanks to relevant modernisation, it is still state of the art. Two DC motors, each with a power of 2,500 kW, set the axial blower in motion – so powerful that they can even deliver wind force 17. During the process, around 9,000 cubic metres of air are moved horizontally in a 125-metre-long, ring-shaped channel. The test vehicle is positioned on a hub with a diameter of twelve metres, so it can be exposed to the wind both frontally and laterally at any desired angle. In addition to a dynamometer, also integrated into the hub is a six-component scale. It is used for highly accurate calculation of various different forces, including air force. The forces are transmitted to load cells via levers and linkages and can then be evaluated.