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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 110 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 80 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.
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