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As the rod hand passes the head and rotation approaches the upright position one is also entering the area where anatomically we are strongest and able to sustain the forces necessary for continuous acceleration. This is also where the haul is initiated.
This is all a very complex way of saying that the bulk of the constant acceleration phase (AND line speed) occurs in a relatively small slice of an already small casting arc, between roughly 12 o’clock and 10 o’clock where Phase 3, Unloading, begins.
As Steve Schullery pointed out, a very rapid acceleration if it lasts only a very short period of time does not get you very much line speed. It is exactly analogous to falling speed due to gravity (a well known constant acceleration force). In a millisecond anything does not achieve a very fast falling speed. Even small increments of TIME in the acceleration phase yield enormous increases in final line speed.
That can only occur IF one can increase either the size of the casting arc…or increase the TIME spent IN a defined casting arc…WITHOUT losing acceleration speed. THAT sounds like magic. How can THAT happen??
Consider this short video. The GII rod is set at 50% flexion. The reason for the angulation will become apparent. This is the effect of hauling in 2 feet of line against a static force.