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Hello Gordy and Happy New Year to the group,
I have enjoyed the discussion on line launch the past few weeks. I think there are a couple of other points to be made. Let us examine the difference of sweep and casts- both can have a section of line move past the tip- or they can be different.Why do we sometimes use sweep for a back cast followed by casting stroke ? Could we use sweep and then sweep for presentation casts? If we have limited casting room we may stall out the back cast by using sweep to miss obstacles on the stream (the timing is key), followed by the delivery. These are just a few examples that come to mind.
The next point is we keep seeing that many think of the cast like an arrow or bullet fired from a gun. I think this causes problems quickly when talking about a fly cast. Biggest difference is the cast stays connected always unless your line breaks during the casts (which I have seen happen). This leads us into the wonderful world of understanding tension of the fly line. Understanding tension of the fly line is key to many advanced casts. By example, we can easily and radically alter any section of line after line launch by increasing/decreasing tension on the rod leg (rod fade is a term I used back in the 80's for describing the decrease-helps to collapse the unrolling line), slight snaps/mends in any direction, and many others. If we ignore these aspects of the entire casts which exist than ones overall line control becomes stagnant.
A collapsed casts is the third one I would address as well. Negative casts are equally important on the water for the fishing casts-are we implying now that a collapsed casts is just a fault?
I think all of the talk in regards to line launch would be better to look at the summations of line momentum for a better grasp on this topic. By example, lets say we make a backcast 45* in back and to the right side of the caster. On the forward cast we use this term of line launch for our teaching method. Now then for the group, how did that alter your line launch and presentation of the entire layout? Once we start doing things a little different for describing a cast it becomes rather apparent that if we use momentum of line during the cast, and alter the tension during the "line launch" that we remain in total control for whatever we desire for total layout of line.
The cast would be complete in my book once we did all of these things and the total line has come to a rest on the water, (even this is a micro second in time because now we implement all of the other line manipulations for overall drift). Line manipulations being much harder to teach and convey than the fly cast itself when working with anglers.
Best to all again for the new year,
Mac
Mac Brown
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[GH] Mac ... Your "definition" of the term SWEEP ?
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[GH] From Mark Surtees :
Hi Gordy
I have been thinking about how the location of line launch direction concept works with roll casts.
Firstly, if I accelerate the rod tip then I do not accelerate the whole line straight away, there is a time difference between when each bead in the chain is going to be moved. Basically, In a good cast they will all be accelerated and decelerated at different rates at different times. This means that there are times during a cast when it is theoretically possible for a bead in the chain near the rod tip to have zero momentum and a bead in the chain near the fly to have zero momentum at the same time? So, looking at the line as a whole, or even the “effective mass”, when is it launched ?
In addition to this, the direction of launch has been largely established during the period of translation during the early part of the cast, Drag in SL terms, a period of relatively low acceleration.
When does the “effective mass” have the necessary velocity and momentum to travel to the target ?
Mark
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[GH] Mark,
Most casters use precious little if any "drag" when they cast except when roll casting. Do those that do use it establish the direction of the cast with it ? I doubt it.
I think the answer to your last question may lie in the question itself, as : "The 'effective mass' has sufficient velocity and momentum when the fly can reach the target." (Looking back from at the final result.)
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