Bobby Unser Collection--Photographs--Family--Robby Unser--Item42

Among Bobby Unser's innovations was his use of a modified flow bench to test the aerodynamic efficiency of various undercar tunnel designs. When shaped properly, these tunnels produce suction that literally holds a race car onto the track. Here Unser and his son Robby use the flow bench for its conventional purpose -- testing the airflow through engine intake and exhaust ports.