The wind tunnel is constructed mainly with aluminum and is supported by a tubular steel framework. The air enters the tunnel through a carefully shaped intake, where the air is compressed and passes through the transparent testing section called the Perspex, giving full visibility of the object to be studied (Figure 1).
Inside the Perspex, there is a static tapping tube upstream of the testing (H1). This tube has a whole in the middle and faces down from the top of the Perspex (Figure 2). Therefore, air does not flow into the whole. This pressure is called static pressure. In order to measure this, a water