THE general arrangement of the wind tunnel shown in Figs. 1 and 3 does not differ materially from the tunnels built up to the present on the plans of Professor Prandtl in Germany, England, America. It is an open jet tunnel with single return flow and two large elliptic nozzles of different design. A single stage helicoidal fan in the return flow provides the air stream. The fan is driven by a synchronous motor across an oil gear, Thoma‐Waldrich type, consisting of two pumps and a motor.
Winter, H. (1936), "A Convertible Wind‐Tunnel: The High‐ and Low‐Pressure Tunnel of the Aerodynamischen Versuchsanstalt Göttingen", Aircraft Engineering and Aerospace Technology, Vol. 8 No. 12, pp. 335-336. https://doi.org/10.1108/eb030127
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