In this paper, we studied the fly rod casting dynamics. A nonlinear finite element model was used to analyze the transient response of a fly rod, in which fly rod responses were determined under the simulation of forward casting stroke. The lumped parameter method was used to discretize the fly line system. Finally, we determined the fly line motions during a cast based on the information of fly rod tip responses, which are the initial boundary conditions of the fly line. The fly line loop generation, propagation, and line turn-over were represented numerically. The results were compared to the rigid rod case, in which fly tip path was specified for a given fly rod butt input. Our numerical results strongly recommended the flexibility (nonlinear) effects of the fly rod must be included in order to capture the actual casting dynamics. The fly rod casting simulation was studied analytically and further experimental validation is needed.
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