 Eberan-Eberhorst initially served as a development engineer within the Auto Union racing department at Horch works in Zwickau, and was responsible for turning Chief Engineer Porsche's ideas in physical reality.His early contributions to Auto Union's successes included development of side skirts and aerodynamic bodywork along the belly of the record breaking streamliner car, additions that were some of the earliest experiments with ground effect downforce to have been applied to a car.When Porsche left Auto Union in 1938 Eberan-Eberhorst was promoted in his stead.