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50ft oh casts, comparison double haul timing

Purpose

The purpose of this comparison is to show the impact of timing of double haul, dhl.

The comparison is made between two simulations, both with dhl and a peak haul velocity of 5.0 m/s:

· “50ft dhl” simulated with the peak haul velocity 100 ms after the max angular velocity, see 50ft oh casts with and without double haul.

· “50ft dhl early” simulated with the peak haul velocity set 85 ms after the max angular velocity.

Input, casting stroke

The timing of the line haul velocity, shown below, is the only input that differs between the two compared cases.

Input, equipment

The equipment for both simulations is identical, see the 50ft oh ref. cast.

Output, animation

Click on the graph below to start animation.

Comment, animation:

The cast with the double haul applied “early” produces a dip in the rod tip path. This is the cause of the tailing loop shown in the animation. This comparison shows the sensitivity to timing of the haul. Note that the loop velocity and loop radius for the case with “early haul” are only shown in the graphs to the time when tailing loop is formed. It is also noted that the simulation (which is 2D) doesn’t simulate all aspects of tailing loops (3D effects are present in reality).

Output, graphs

The graphs considered most relevant for the comparison are presented below. For explanations to the graphs please see the 50ft oh ref. cast.

Output, energies and work