GM Reduced Scale Wind Tunnel

General Motors Aerodynamic Engineer Nina Tortosa (left) and GM Creative Sculptor Bailey Sisoy Isgro work on a 40-percent clay scale model of a Chevrolet Impala at General Motors’ new $30 million Reduced Scale Wind Tunnel at its Technical Center in Warren, Michigan. Refining aerodynamics at 40-percent scale is highly effective because shaping one pound of clay is equivalent to working with 16 pounds of clay at full scale. (Photo by John F. Martin for General Motors)