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Sensitivity analysis, bending properties of fly line

Purpose

The purpose of the sensitivity analysis is to determine how the numerical solution is affected by changes in the bending stiffness, EI, for the fly line.

Method

EI is the product of the Young’s modulus, E, and the second moment of inertia, I. No direct measurements have been made to determine EI for the fly line. The sensitivity of the solution to changes in EI is analyzed:

· The 50ft oh ref. cast is used as reference (E as for all calculated casts except the one below).

· A solution, denoted “50ft EI flyline +50%”, is calculated with a 50% increased Young’s modulus as the only change in relation to the reference cast.

Results

The solutions are compared in the animation below (click on image to start animation).

Conclusions

· Increasing the bending stiffness by 50% in relation to reference gives a limited impact on the computed cast.

· It may be concluded that the sensitivity of the solution to changes in the bending stiffness is comparatively small.

· Note: The monofilament leader is made of materials e.g., nylon/polyamide, with known Young’s modulus and need not be analyzed.