 With the usual set-up, the wind tunnel can, at max velocity, attain a Reynolds Number of over 5,000,000.The removable test section currently in use in the tunnel utilizes stretched Kevlar walls which allow sufficient air flow to exit the system while not disrupting the airflow within the test section.This causes an absence of background noise allows researchers to monitor the sounds coming from the test section with microphones in order to gain data regarding the airflow and turbulence of smooth airfoils and other objects.