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Switch casts

Background

The switch cast may be considered as a further developed roll cast. A switch cast produces more fly line behind the caster at the on-set of the casting stroke (compared to a roll cast) in what is usually referred to as a D-loop. More line behind the caster increases casting distance. The switch cast is made in what may roughly be described as a seamless sequence of pick-up, “surface touch & go” and delivery stroke.

Purpose

The purpose of this section is to show approximate simulations of switch casts. The simulations start with the “surface touch & go” and are followed by the application of the delivery stroke. Two switch casts are compared:

· excl. double haul, denoted “switch cast excl. dhl”.

· incl. double haul, denoted “switch cast incl. dhl”.

Input, casting strokes

The angular and translational motions for both switch casts are identical, shown in the two graphs below:

The switch cast incl. double haul was computed with the haul/feed velocity as shown below (for the cast excl. double haul, these velocities are zero):

Input, equipment

The equipment used in both switch casts is identical to the equipment used in the 50ft oh ref. cast.

Output, animation

Click on the graph below to start animation.

Comments, animation:

One challenge in making an efficient switch cast lies in the timing of the “surface touch & go” (in simulations as well as in reality). The advantage of a switch cast, compared to a roll cast, is increased amount of line behind the caster and hereby increased casting distance.

· The roll cast on a water surface gave 50 ft distance, see 50ft rollcasts.

· The switch cast excl. double haul gave 55 ft distance.

· The switch cast incl. double haul gave 60 ft distance.

Output, graphs

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

Output, energies and work