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Loop morph & water tension
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- Paul Arden
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Loop morph & water tension
You might need to look at it in 4K to see the loop morph, and on a laptop.
I found the stability of this loop to be very interesting because it started from an on-the-water position. It makes me think that the anchor in Spey casting doesn’t just stabilise the D-loop but also might add additional tension to the loop while it unrolls, which is why you commonly see these loops in Spey casting but less so with overhead casting. Is that possible? Or is it that the water tension allows us to eliminate the Dangle? Ie the line is perfectly straight to the fly.
So my question is the “cleaner” loop shape a result of more tension in the fly leg or a result of a straighter fly leg?
Any ideas?
Cheers, Paul
- gordonjudd
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Re: Loop morph & water tension
Paul,So my question is the “cleaner” loop shape a result of more tension in the fly leg or a result of a straighter fly leg?
I would add the impact of drag forces (especially form drag) to that list of factors that impact loop morph.
I would agree with Thorsten that:
GordyThe wedge shape is usually a result of loop morphing, such loop shapes begin with a roundish loop and morph into a pointy loop shape.
Major factors that promote in my opinion the change of shape are the trajectory of the line, tension and aerodynamic forces (especially the drag force). If the line speed is high enough even large rounder loops morph into this shape.
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Re: Loop morph & water tension
Thanks Gordy. Hope you are well! I was really interested in the difference between two loops, one delivered from an anchor placement and the other from an aerielised position. I’m on my phone now but I’ll open up the laptop later and grab a few frames. I just remember thinking at the time that the loop had much more stability than I’m used to seeing and it reminded me of a Spey cast.
Cheers, Paul
Cheers, Paul
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Re: Loop morph & water tension
OK I think there is something more interesting going on here and I would like to try to understand it.
"Tension Cast" There is a bend put in the line due to tip path trajectory in relation to fly leg. Which then becomes "wavy" How does this part happen? The wavy part overtakes the fly leg in front. And then how/why does it disappear? Maybe it's not so stable after all
Thanks, Paul
"Tension Cast" There is a bend put in the line due to tip path trajectory in relation to fly leg. Which then becomes "wavy" How does this part happen? The wavy part overtakes the fly leg in front. And then how/why does it disappear? Maybe it's not so stable after all
Thanks, Paul
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Re: Loop morph & water tension
Is it an acceleration because of the wavy part reaching the front taper of the fly line perhaps?
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Re: Loop morph & water tension
Paul Arden wrote: ↑Mon Sep 20, 2021 4:45 am OK I think there is something more interesting going on here and I would like to try to understand it.
Hi Paul
It's now off your original question but I have been puzzled by exactly that occurance, an initial bump morphing into an overtaking loop. I have very similar footage.
I believe it is exactly similar in dynamics to a dangle overtaking, just upside down. What causes the overtaking though? Form drag is an easy candidate at the latter stages where there is a significant frontal component, but the initial bump's form drag is not that situation at all.
There is more at play and I think the tendency for the very tail part's direction of travel to govern line travel and loop shape is a major player.
All the best,
Dirk
- gordonjudd
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Re: Loop morph & water tension
Dirk,an initial bump morphing into an overtaking loop.
Could you point out where the initial bump occurs and then sequence of shapes where it morphs into an overtaking loop? What does it overtake?
Are you talking about the transverse wave that is propagating towards the fly end of the line or some other disturbance that overtakes the front loop?
Thanks for clarifying what you and Paul are seeing in that sequence.
Gordy
- Lasse Karlsson
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Re: Loop morph & water tension
Gordy, I think it's the end of the flyline, where the wave turns into a loop that overtakes the end of the line, not the leading edge loop. you can see it in the second last picture of Pauls.
My take is its slack getting jiggy with tension...
Cheers
Lasse
My take is its slack getting jiggy with tension...
Cheers
Lasse
Your friendly neighbourhood flyslinger
Flycasting, so simple that instructors need to make it complicated since 1685
Got a Q++ at casting school, wearing shorts
Flycasting, so simple that instructors need to make it complicated since 1685
Got a Q++ at casting school, wearing shorts
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Re: Loop morph & water tension
Hi Gordy
The shape's traces are in yellow, showing the evolution from a quite subtle initial bump.
Best regards,
Dirk
Here you go, Gordygordonjudd wrote: ↑Sat Sep 25, 2021 2:02 pm Dirk,
Could you point out where the initial bump occurs and then sequence of shapes where it morphs into an overtaking loop? What does it overtake?
The shape's traces are in yellow, showing the evolution from a quite subtle initial bump.
Best regards,
Dirk
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Re: Loop morph & water tension
Hi chaps,
I’m not even sure it was a bump as much as an angle change from tip path the original line position. I agree that it’s an inverted Dangle, Dirk. It’s fascinating that it then starts to overtake.
Cheers, Paul
I’m not even sure it was a bump as much as an angle change from tip path the original line position. I agree that it’s an inverted Dangle, Dirk. It’s fascinating that it then starts to overtake.
Cheers, Paul