Various early design work included design concepts for truck rear-tire "Bogie Skirts" to aid in aerodynamic performance. Such skirts have never been production-ized to this day, although many concepts have been created and showed. The side skirts did however go in to production and utilized a GE engineered plastic (GTX) that was blow-molded into parts that could be trimmed to cover trucks of various wheel-base configurations. This was a first in the industry for trucks and for blow-molding and Navistar was awarded innovation accolades by the Plastic Industry. These Side-Skirts were also early predecessors to improved Aerodynamic devices seen today. I was involved in extensive wind-tunnel testing and research through-out the development cycle and have continued to foster strong relationships with my peers in Aerodynamics Engineering.