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Walter & Group...
[GH] Sometimes I receive a message with a question for which I don't have an accurate answer. When that happens, I seek the advice of experts to help us.
Here is one such question:
>From Jim Hund:
Dr. Gordy:
This discussion brings out just how quickly the end of the stoke occurs and how many things happen during the split of seconds between the stop of the rod butt and RSP 3. I have a question (probably a dumb one) related to your response to the post of Bob Dionne. Your response mentions the term "line launch." In my mind "line launch" occurs when the line (in the formation of a loop) over takes the rod tip. Is "line launch" different from loop formation at RSP1? If so how and when does it occur?
Thanks
Jim Hund
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[GH] Jim,
Your question is a good one. After I received it, I went to the fly casting literature and after reviewing the works of many authors, could not come up with a solid answer. I took two days to try.
Here is the way I've been looking at the "launch point" :
There is likely a point a fraction of a second before RSP 1 (the first rod straight position) when there occurs the beginning of a disconnect of the tension between the rod tip and the oncoming line. This is just prior to the point, at ... or so close to RSP 1 that we have not been able to separate the two, which the line starts to actually overtake the rod tip as the start of loop formation. The line which will become the fly leg (top leg) of the loop becomes launched (propelled), and a split second later we have a loop which travels in a given direction which some of us have called the "launch angle", or "trajectory" of the cast. This angle is generally considered that between the direction of loop travel and the ground or water. Of course, this is based upon the assumption that the cast was made in the vertical plane.
Since my information is not based upon actual experimentation and observation, I can't carry it further without the help of those who have more information on the physics of this phenomenon.
I'f my way of looking at this is off base, then I stand to learn along with you.
Gordy
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