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

The purpose of these simulations is to illustrate the impact of double haul on a periodic cast.

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 reference cast, the peak haul velocity is 3.8 m/s and is set 50 ms after the max angular velocity. The angular velocity and the tackle are kept unchanged.

Input (shown for one stroke)

Output, animation (click on image to start animation)

Output, additional results

Graphs below shown for one stroke

Notes on energies and work:

· The kinetic energy for the line includes leader and fly.

· An offset giving the minimum line kinetic energy 0 has been applied.

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

· The rod strain energy is increased for the cast including double haul. However, the increase in line kinetic energy is significantly larger than the increase in rod strain energy indicating that most of the increase in work input by the caster “goes directly to the line” and only a smaller portion via increased “strain energy stored in the rod”.