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Walter & Group...
[GH] So far, Mark Surtees' questions have yielded more questions than answers. Mark is away, so I'll air a few of these and give my thoughts until he returns and has a chance to review them.
Gordy
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>From Rory Graham (After a brief private exchange of messages following which I withheld his answers until a few things were clarified ):
Thanks for that Gordy.
It's funny. You know, it occurred to me that some additional parameters needed to be defined, but I tried to do the best I could in keeping answers as short and simple as I could, with the scenario Mark put forward. A common thing I get from your group is that when a question is put forward - ask more questions to find out what the questioner really wants, and also that no matter how you might try to keep answers simple (for us simple folk), mostly discussions and answers develop or require a snowball effect, if you know what I mean.
I guess it's important to establish what's at the heart of the question?
I look forward to seeing the answers.
Kindest regards
Rory
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>From Frank Hartford:
Hi Gordy
I'm already in trouble . Could you ask Mark to further distinguish between casting angle and casting arc ? I have always described the arc in terms of the angle .
I also thought that to make an object accelerate one must apply a force of increasingly greater and greater magnitude .
Thanks
Frank
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[GH] Until Mark returns....
My take is this. To many, the terms are synonyms. The fly casting literature and lexicon are saturated with the use of the term "CASTING ARC".
One description: "The angular change in the position of the rod butt from the start to the completion of the casting stroke."
Another: "CASTING ARC : The angular change of the rod during the casting stroke."
SexyLoops definition: "Casting Arc: Change of rod-angle during a Casting Stroke."
Some experts take issue with the term, "ARC". They reason that as an angular change, there really isn't a true arc involved. I side with them, and I think Mark does as well.
In Mark's message, we have this: "The term Casting Angle is used to represent the angle that a rod has rotated through between RSP back and RSP front as opposed to Casting Arc."
By this I think he means that he prefers the term "Casting angle".
Gordy
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Pat Blackwell cites a passage from Mark Surtees' message on hand path and the term, "curvilinear translation", which he questions:
>From Mark,
(Mark)
"Hand Path as a term to represent the actual translation of the rod in a curvilinear sense. That is, the curvy journey the rod actually takes from A – B which may not be, and hardly ever is, either horizontal or the shortest distance.
Curvilinear translation” and “rotation” are not at all the same thing."
Hi Gordy,
The term “Curvilinear translation” is one I'm not familiar with. I googled the term and got in way over my head, but did come up with an idea of what it may mean in fly casting terms.
If I'm understanding the term “Curvilinear translation” correctly, the fly rod is moved along a curved path with all parts moving at the same speed, i.e. the rod butt and tip are moving at the same speed (translation). The rod butt and tip may be moving in the same plane (parallel/horizontal to the ground) or in different planes (at some angle other than parallel/horizontal to the ground) on a curved path versus a desired straight line path.
If I'm not correct in my over simplified understanding, perhaps one of the groups members can explain it in laymen's terms.
Regards
Pat Blackwell
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[GH] Pat,
We'll best await Mark's return so he an clarify what he means by "Curvilinear translation".
I think he may mean a slightly curved path ... that path being produced by a simultaneous rotatory and translational movement.
"Consisting of or bounded by curved lines." *
* Online dictionary.
Gordy
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Guy Manning requests this clarification from Mark :
Mark writes: ... "Plus, for so long as we apply force of a particular magnitude to an object that, once we have got it moving, it will accelerate.
1. I am going to make two Casting Strokes. If I apply a force to the rod over a Casting Angle of 45 degrees in the first and I apply force of the same magnitude to the rod but continue through a Casting Angle of 60 degrees in the second..."
In the first sentence, is this a statement of fact? Or, is it to be taken as a conditional "given" for the questions, i.e. all casts discussed will be assumed to be performed with sufficient force and true acceleration?
In the second, Mark doesn't define his term "magnitude". Am I to assume it means force and distance, or does it also include elapsed time? That changes the answers.
Guy Manning
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