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50ft oh casts, comparison incl. and excl. double haul

Purpose

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

The comparison is made between two simulations:

· The 50ft oh ref. cast simulated without dhl.

· “50ft dhl” simulated with dhl. Double haul denotes the hauling of line during the casting stroke and the release of line from the rod during the pause. Here, the line length for the simulation with double haul is up to 0.50 m longer than for the 50ft reference cast. The peak haul velocity is 5.0 m/s and is set 100 ms after the max angular velocity.

Input, casting stroke

The line haul velocity and line feed velocities, shown below, are the only inputs that differ between the two compared cases. For the 50ft oh ref. cast, haul and feed velocities are both zero.

Input, equipment

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

Output, animation

Click on the graph below to start animation.

Comment, animation:

The haul increases rod loading/bending during the acceleration/deceleration phases and this leads to increased line speed. Another benefit of the haul is the decreased loop radius leading to decreased air drag. Reduced loop radius is markedly useful when casting into the wind. It is noted that the haul must not be excessive as that may lead to a dip in the rod tip path and possibly to tailing loops.

Output, graphs

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

Note: The rod tip speed equals the line speed at the rod tip for the “50ft ref.” cast (no line haul/feed).

Output, energies and work

Note on energies and work:

· The increase in work input by the caster for the dhl cast is partly due to increased work at the rod handle and partly due to the added work by the hand hauling line.