Server...
So far, I think I understand what you are talking about. In non scientific terms:-
STOP of the caster's hand is one thing. That of the rod tip quite another.
As I see it, neither is mandatory to make a cast and propel the line loop. A rapid deceleration of the hand to a stop, however, on a maximum distance cast allows the rod tip to continue with increased velocity until the rod straight position whence the line can overtake the rod tip and fly line loop formation occurs. That is what I see in the video studies.
I suspect we casting instructors are really using the term, "stop" (of the caster's hand) to encourage such a rapid deceleration as to get as close as humanly possible to a technically impossible feat.....that of an absolute stop.
Of course, that's only part of the story as we see the rod go into counterflex with no stop of the tip at the rod straight position. The rod tip then has a brief stop and then returns in what we've chosen to call, "rebound". By that time, the loop is on its way in the direction of the cast.
That the rod tip does NOT come to a stop as the loop is formed and starts on its way, to me, is a given.
When making distance casts, however, the casters who are most successfull are clearly those who make the best attempt to achieve a stop of the hand prior to the rod straight position. Frankly, I doubt that any human can actually come to a true stop at that point if we define stop as cessation of all motion. That's the way it appears to me as we watch the casting hand with slow motion video.
There is a cast known as the, "cheat roll cast" in which the caster stops the butt section of the rod by allowing it to strike his other forearm.....or, better yet, a stationary object. The effect of increased velocity of the fly line loop is dramatic.
But for other casts; a true, "hard stop"?? ......I think not.
Gordy
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Subject: Re: High Speed Data for Straight Rod Tip Trajectory Cast
Date: Sun, 19 Mar 2006 14:47:41 EST
Hi Gordy,I guess I was going to say that I didn't want to belabor this point -- but in truth I guess I do. The world of fly casting would be better off if the term "hard stop" had never been invented. It puts a real crimp in any credibility when viewed from a scientific standpoint. In most distance casting a hard stop is never even attempted let along achieved. But to go into that I will have to explain some real Casting Physics and I don't have time right now because I have to go to my office and prepare an hour exam on rigid body dynamics. Just a few notes to tickle your interest however. 1) -It is abundantly clear from expected structural dynamics and any available data that considerable positive work is performed on the rod-line system after maximum road loading occurs. All this translates into additional flyline flight speed (a primary goal in casting). 2) there is plenty of discussion flying around concerning casting analyzing data and its too bad noone has taken any kind of examination of the information. When I saw this data the first time a few years ago it largely confirmed to me noone performs hard stops as well as why. As a little challenge to any readers take a look at the data with my statement in mind that it clearly shows no stop at all is occurring until all rod vibration has been absorbed by the casters hand. Part of this is almost a necessity from physics -- not understanding it reflects just that weakness. OK so the analyzer developers didn't interpret what is going on -- the data demonstrates the rod continues to rotate in the direction of cast long after rod unload starts and in fact after counterflex (thanks again to Jeff Wagner for that term). Again the most critical phase of this is completely what one would expect -- because violating it would create large rod vibrations. 3) folks trying for long distance casts using choreographed casting motions are using what I term "Base Motion Augmentation" to increase the work performed during the real casting phase. To explain this I would have to explain some real physics. The high speed data is from that type of cast and performing this type of cast depends on maintaining as high as possible a translational rod butt velocity throughout the cast until the line is in free flight so there cannot be a stop at all.More later. I sent another note explaining some things about line physics and aerodynamics effect on flylines but it may be that when I try to reply to everyone my E-mail doesn't go through. Did you receive that message?Thanks again for maintaining this informational web site - Server