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Walter & Group...
[GH] Alejandro Vinuales was the caster in Aitor's videos. His comments:
Hi Gordy,
Aitor’s videos are not about the haul, are on the evolution of tails (traveling waves) depending on the formation time.
We use a haul to form the tail because you can easily create any time of the cast. Mark made the haul while I handled the rod because this way is easier separate the two movements.
The only haul function in this case is to produce a quick loading and unloading of the rod, before rod stopping. This causes the movement of descent and ascent of the tip which produces a tail. Not exactly an example of a good haul.
The bending produced by a haul depends largely on the acceleration (also the angle between the line and the rod, and the previous load level) and therefore Mark performs a sharp haul, more sharp in the video "Late tail".
Cheers,
Alejandro
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From Bruce Richards:
Gordy,
The whole process for loop size determination is this.... Assuming a straight top leg..
The position of the rod tip at max counterflex, between RSP1 & RSP2 determines the initial size of the loop. In extreme distance casts, this is the very large bottom leg belly we see, sometimes almost to the ground. In lesser casts it is smaller.
Rod tip position at RSP2 determines the ultimate real position of the bottom leg. In most casts the rod butt continues to rotate a bit, sometimes quit a bit, in the time period between RSP1 & 2. This lowers the rod tip, and the final position of the bottom leg.
The bottom leg "bump" caused by counterflex is pulled out of the line "sucking it up" as Paul puts it, by the tension in the line generated by the pull of the loop front and the resistance of the rod at the other end.
Reducing counterflex by reducing rod bend (which can be done with hauling), and stopping the rod as quickly and completely as possible will result in the tightest loops. That said, having a very tight loop isn't really all that important for most situations. The key to casting efficiency is having a loop with a very straight top leg that is aimed at the target. The top leg of the loop is the only part that is traveling very fast. The loop front travels half the speed of top and bottom leg speeds combined. The bottom leg rarely travels very fast. Since the effects of wind resistance are exponential (double speed, quadruple wind resistance), it is critical that the part of the loop that travels the fastest offers the least profile to the "wind". That means it must be straight, and pointed at the target.
Think of the top leg like an arrow, how efficient would an arrow be if it wasn't very straight, or if it was shot so it travelled sideways? Not very...
Gordy, forgot to make one point in the last note. Lasse's video clearly demonstrates what I'm saying about bottom leg position. The softer rod had more counterflex and initially the loop made by that rod was significantly bigger than that made by the faster rod. But after the loop has progressed a ways they become the same size. Since both rods were somehow tied together their resting position at RSP2 will be the same, and that determines the ultimate position of the bottom leg once the "counterflex bump" has been "sucked up".
I have two questions regarding the new answer: "At or slightly after RSP. Answer to students = at the end of the stop. "
1 - Why "or slightly after RSP"?
2 - The "stop" takes a small fraction of a second, (~.1 sec in most cases) can someone really time a motion to coincide with the "end" of the stop?
For normal casts it takes about .1 sec for the rod to straighten after deceleration (the "stop") begins. If explaining when the haul should stop to an instructor I'd say, ".1 sec after the stop is initiated". To a student "stop hauling when you stop the rod".
Bruce
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[GH] Bruce,
Re. your last paragraph: I agree. Nothing gained by stopping the haul at any point after RSP. If you make a haul after RSP or continue the haul after it, you get the effect of a check haul. More rapid turnover of the loop with less distance.
I like that "straight arrow" analogy.
Those with a burning desire to really understand the mechanics of loop size determination would be well advised to archive your message. Gets to the heart of it!
Gordy
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