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Walter & Group....
[GH] From Ally Gowans :
Hi Gordy,
I believe that these guys that answered have given this a bit of thought and I guess that there might be a few who didn’t answer because the answers are not in the books!
It appears that the responses from John Symonds and Jim Chestnut may have gotten mixed in the wash and it would be appreciated if you could look into that for me before I put in two cents worth!
I think I will respond by gathering the answers to each question together and commenting.
Best wishes,
Ally Gowans
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[GH] That Ally has come up with a thought provoking quiz is an understatement ! It makes us all think. This is reflected in the diversity of answers and the fact that many of you have thought deeply about the subjects to the point that you have seen fit to change some of your answer along the way.
Answering questions at this level requires a truly in-depth understanding of fly casting mechanics reaching out to the vast as yet unknown which stretches ever before us.
Do we need to know any of this in order to be better casters ? I think not.
Does it help us teach basic fly casting ? I doubt it.
I do, however, feel that this information helps to increase our background knowledge which may help us improve what we do and what we teach in the long run as we try to develop new ideas and new improvements to fly casting.
Just as important, I think, is that by delving into the myriad ramifications of fly casting mechanics and the almost infinite variations it give us insight into understanding not only the differences in the various styles, opinions and teachings of the World's experts and fly casting authors but also their commonalities.
Gordy
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[GH] Gary Davison sends his answers :
[GH] From Ckling (I've placed his answers in blue) :
Hi Gordy,
1.) Are any two casts identical? No
2.) Does it matter where a loop is first observed? Depends on whether you are talking to a beginner or a more advanced caster . For a more advanced caster knowing this they may be able to adjust their casting to affect the loop formation . For a beginner no.
3.) How would you recognise loop formation? A loop forms when the fly leg has rolled over itself to form the rod leg. Some people say this occurs at RSP while others say at maximum counter flex. From a practical standpoint I like Soon Lees description of the STOP as deviation from SLP up to eventual RSP or rod holding position as a determinant of the size of the loop face.
4.) and if it could be observed how would it help you to teach me? Deviation from SLP and eventual rod holding position are events you can easily observe, and we can easily teach.
5.) Defining “useful energy” as that which is the line requires to extend correctly. When does the rod cease to provide “useful energy” to the line? When we apply a force/energy to the rod and line system. we are using the rod as a lever to directly accelerate the line and we are bending the rod to store spring/potential energy for when we unload the line. There is no useful energy when we move the line at a constant velocity, when we creep and when we are pulling slack line in the cast.
[GH] Ling's second answer to 5.) :
Misunderstood question 5,
New answer ; the rod ceases to provide useful energy to the fly line when the acceleration vector in the direction of the line launch is less than the following fly line.
6.) Is it possible for the line and rod tip to travel together without useful energy interchange?
When we move the rod tip and line together at a constant velocity. when we drag a horizontal rod with the line attached. in fact in all situations where the rod tip moves without an appreciable bend in the rod.
7.) If the mass of a fly line is considered to concentrated at a single point and the rest of the line is considered weightless does this help to illustrate the location of the line launch direction?
In a spinning or bait-casting system the linear acceleration of the mass/weight determines the line of launch for that mass, so yes it will help in determining line launch of an accelerated fly line.
7.) If the line is now considered to be a chain of different link sizes to replicate the taper what change does that make to your consideration? Because the chain has a significant mass attached to it, it may affect the trajectory of the chain launch depending on the size of the acceleration away from the intended path and the amount/ mass of trailing chain.
8.) Does the line launch direction indicate where useful energisation of the line ceased? No see no. 7. A line acceleration away from the intended path still contributes to the fly leg acceleration in the intended path depending on the amount of acceleration away from it and the moving mass/length of line that is being accelerated.
9.) It is better but is it absolutely necessary to have a rod that bends?
For efficient casting of a flyline a rod that bends facilitate the conversion of rotational acceleration/torque to linear acceleration of a flyline as the rod can produce approximate SLP.
10.)
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Most likely between d and e as that seems to be the point where the rod tip path deviates from the approximate straight line acceleration path. The line looks like a shooting head or one where there is a lot of overhang which cant influence the trajectory of the line momentum.
Ling
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[GH] Many thanks to Aitor Coteron for having provided video evidence of what can happen when an expert caster makes a cast with a stiff fly rod. This is a graphic answer question 9.) :
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