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50ft oh cast reference

The purpose of this simulation is to illustrate:

· The casting stroke, given as input.

· Input defining the rod.

· How a simulated cast can be animated.

· Some additional output data of relevance.

Input

The casting arc is the angular difference from the start of acceleration to the loop is formed.
It is the area under the curve in the figure above for the corresponding times.

Rod input data (5wt rod).

Note: The mass density including the fly line was used in the calculations.

Output, animations (click on image to start animation)

The animation below includes a “stiff rod in black” showing the hand movement.

Output, additional results

Graphs below are shown for one stroke (50% of a complete casting cycle).

The rod tip trajectory is the path the rod tip travels (impacts loop shape). Notes:

· The rod tip path shouldn’t be too curved as this leads to wide loops (high air drag).

· If the trajectory has a “local dip” that may generate a tailing loop (and line tangle).

The horizontal loop velocity is the velocity of the leading edge of the fly line loop. Notes:

· The loop starts to propagate when the fly line moves “ahead” of the rod tip.

· The time window for the loop velocity differs from the other time plots below.

The horizontal rod tip velocity equals the line velocity at the rod tip (if no line haul/feed)

The line tension at rod tip is the “pulling” force accelerating the line.

The horizontal rod tip deflection is a measure of the bending of the rod:

The bending moment at the rod handle gives an approximate measure of the wrist strength required by the caster. Notes:

· The bending moment in the graph below is defined at the interface between blank and handle.

· The caster’s grip is “at the handle”, so the applied bending moment by the caster isn’t exactly as the curve below.

The energies presented below include rod+line+leader+fly.

Note: For symmetric casts, as the one shown here, the energies at the start and end of each stroke are equal.

The cumulative work (from start) by fluid drag and material damping, presented below, include rod+line+leader+fly.