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50ft rollcast

Purpose

The purpose of this section is to show a rollcast starting and ending with the line on the water surface showing the ability to simulate interaction with a water surface e.g., with the water acting as “anchor”.

Input, casting stroke

Generating the starting position for a rollcast i.e., setting up the D-loop, is usually followed by the casting stroke in a seamless movement. This sequence is difficult to simulate in 2D and, therefore, a simplified rollcast is shown here for the casting stroke only.

The input for the casting stroke is presented below (with the “history” excluded):

Input, equipment

The equipment used is identical to the equipment used in the 50ft oh ref. cast.

Output, animation

Click on the graph below to start animation.

Comments, animation::

The D-loop shown above is a “poor” D-loop because only a small portion of the line will initially be accelerated in the casting direction. This contributes to the wide loop forming after the casting stroke. A larger D-loop extending further to the right in the figure above would be preferred.

The animation demonstrates the capability to simulate interaction of the line with a water surface. The axial drag on the fly line on the water surface produce what is referred to as an “anchoring effect”. In the vertical direction the buoyancy i.e., the force that makes a floating fly line float on the surface, gives the line a realistic landing on the water surface.

Output, graphs

The graphs below are shown for the time corresponding to the animation above. For explanations to the graphs please see the 50ft oh ref. cast.