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The Aerodynamic Tunnel, 300 x 300 mm, "TA300/300", designed by EDIBON, is a wind tunnel designed to study subsonic aerodynamics in a tunnel in open circuit and with incompressible subsonic flow. Air is drawn by a variable speed fan located at the discharge end of the tunnel. Several models and accessories are available, allowing a comprehensive study of subsonic aerodynamics. The unit includes several tunnel sections. In the same order in which the flow crosses them, they are: lips, haven section, contraction, working area, diffuser and fan. Lips and a haven section are incorporated at the tunnel inlet to reduce the pressure drop and the interferences in the flow. An 9.5:1 contraction ratio and a perfectly studied contour curve of the contraction ensures well developed airflow through the working area. The working area is located after the contraction. It is a constant section tract, where the models to be tested are assembled, and the dimensions of the transverse section is bigger than the models. It is made of PMMA to allow to observe the models. This section includes a Pitot static tube in the top side to study the static pressure, dynamic pressure and total pressure. A diff