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Analysing loop propagation
Moderator: Torsten
Re: Analysing loop propagation
To which my answer is: Yes, watch this video ...
Imagine what would happen if the floor was above my head.
Imagine what would happen if the floor was above my head.
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Re: Analysing loop propagation
I don’t have to imagine anything I have a tile floor and a bead chain! I can’t go from one big loop to many small loops, so there is no transverse wave propagation unless there is tension on the line perpendicular to the tip path, either tethered or from gravity. If there was transverse wave propagation I would be able to go from one to many on the floor. That simply doesn’t happen - I must admit I tried it just to be sure
Cheers, Paul
Cheers, Paul
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Re: Analysing loop propagation
I am fully aware that a transverse wave will propagate through a string suspended under the weight of gravity! That’s the part I was taking out of the equation
Re: Analysing loop propagation
Why were you taking it out of the equation? Are you heading to the space station soon?
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Re: Analysing loop propagation
Are you saying that the flycast is only a transverse wave when affected by gravity?
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Re: Analysing loop propagation
Just so we are discussing the same things.
Cheers, Paul
For you the height of the loop is half the wave length I assume. What is the amplitude? Back and forward casts combined, or just one of them?
Cheers, Paul
Re: Analysing loop propagation
No. I'm saying it's a transverse wave.Paul Arden wrote: ↑Mon Sep 28, 2020 4:02 pm Are you saying that the flycast is only a transverse wave when affected by gravity?
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Re: Analysing loop propagation
This is where things get complicated because our string is not long enough to get the complete picture. Give me a 50 metre tall tower and a 100 m long level line and I can get closer to it for you.Paul Arden wrote: ↑Mon Sep 28, 2020 5:09 pm Just so we are discussing the same things.
8B7B5C3D-D372-4B56-99F4-2C6D7FBBEFDF.jpeg
For you the height of the loop is half the wave length I assume. What is the amplitude? Back and forward casts combined, or just one of them?
Cheers, Paul
Frequency (1/period) can be measured easily and from that we'd need to calculate wavelength. Wave speed (c) can be calculated from the descent rate of an object under the influence of earth's gravity and the period.
Amplitude can't be measured because it is dependant on the input from the caster/rod. Give it a bigger hit and the amplitude increases. Since we almost never use the perfect amount of power (where the loop only just reaches the fly), amplitude only has a minimum value, not an actual value unless we underpower the cast.
To answer your question, the minimum amplitude is how far the loop travels from my feet, either forward or backward.
Cheers,
Graeme
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Re: Analysing loop propagation
I suppose another difference when fly casting is that the 1/2 wave length decreases in size as the loop unrolls, usually disappearing to zero? Whereas with tethered string one would expect the transverse wave to propagate at 90 degrees away from tip path, with a maintained constant wave length?