Experimental investigations on the fly rod deflection (rev 2.0). In the following I investigate physically/mathematically the influence of the fly rod deflection on the fly cast based on experimental data. For a better understanding of the influence of the deflection the properties of the used fly rod were compared with an absolutely stiff fishing rod. My investigations show, that the deflection of the fly rod leads to advantages during the whole duration of the fly cast. These
advantages result mainly from the effects of the conservation of angular momentum and the spring tension energy. The parallel translation can help to use these effects better. According to the missing deflection the absolutely stiff fly rod does not show such advantages. The flexible fly rod transfers the energy which is inferred into the grip much more efficient into the tip than the absolutely stiff fly rod can do.