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Search found 1372 matches

by gordonjudd
Thu Aug 20, 2020 2:30 am
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5864

Re: The Triple or Check Haul

Problem: we have no record to compare with. Merlin, Here is an example of false casting my 6 m length of floating line (no leader). The back cast was started before the loop rolled out to measure the effect that had on the velocity of the loop and fly leg. I hope this helps. https://vimeo.com/44950...
by gordonjudd
Thu Aug 20, 2020 1:42 am
Forum: Flycasting Physics
Topic: Q: Why does a cast “collapse” if the casting stroke is started before the previous loop has straightened?
Replies: 13
Views: 1598

Re: Q: Why does a cast “collapse” if the casting stroke is started before the previous loop has straightened?

That’s easy to test.
Paul,
That would be great to get some video examples.

I have cracked off many a fly in my time by starting the forward cast too early, but did not notice that it had the effect of collapsing the loop on the forward cast.
Gordy
by gordonjudd
Wed Aug 19, 2020 6:14 pm
Forum: Flycasting Physics
Topic: Q: Why does a cast “collapse” if the casting stroke is started before the previous loop has straightened?
Replies: 13
Views: 1598

Re: Q: Why does a cast “collapse” if the casting stroke is started before the previous loop has straightened?

Gordy, plug distance casters know that if their plug isn't directly behind the rodtip when they make their forward cast, the distance suffers, and the cast could be considered collapsed. Lasse, I think we must be talking about different things. Here is an example of what I am talking about where a ...
by gordonjudd
Wed Aug 19, 2020 3:03 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

This tension, at the top of the loop, that is pulling the flyleg. How does it relate to loopsize? Does it increase or decrease with smaller loops?
Joakim,
As has been pointed out before, for a distributed mass (unlike a point mass) the tension is independent of the loop size.
Gordy
by gordonjudd
Wed Aug 19, 2020 1:27 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

In fact, I was referring to when the line is left before the loop is formed, I don't think I understand what you are seeing. Can you show a video that shows a case where the fly end of the line is traveling faster than the front of the line going from RSP0 to RSP1? The trailing line is being pulled...
by gordonjudd
Tue Aug 18, 2020 11:58 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

while the line is in flight the front slows down more than the back
As long as the fly leg is being pulled by the tension at the top of the loop and there are no transverse waves growing to produce loops in the line I think the speed of any point on the fly leg is the same.

Gordy
by gordonjudd
Tue Aug 18, 2020 3:25 pm
Forum: Flycasting Physics
Topic: Q: Why does a cast “collapse” if the casting stroke is started before the previous loop has straightened?
Replies: 13
Views: 1598

Re: Q: Why does a cast “collapse” if the casting stroke is started before the previous loop has straightened?

A part of the force in the casting stroke that should have been used to generate linespeed was instead used to stop/reverse the line. Joakim, Can you post a video that shows what you are experiencing? The simple finger/spring/marble model predicts a faster marble release speed when the initial cond...
by gordonjudd
Mon Aug 17, 2020 8:12 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

You haven't asked any questions at all about why my casts failed because you're not interested, you just want to make it fit with your confirmation bias. James, To the contrary, I would like to see your videos that show the details of why your casts failed. I was just pointing out that it is easier...
by gordonjudd
Mon Aug 17, 2020 6:05 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

To my mind the current models do not predict this effect (unless I've missed something), as such perhaps the models are missing something fundamental. James, I expect that Gatti-Bono's equations governing the dynamics of loop generation are quite complete. The problem is they are so complicated (si...
by gordonjudd
Sun Aug 16, 2020 12:32 pm
Forum: Flycasting Physics
Topic: Physics Q/As for the casual reader
Replies: 15
Views: 1837

Re: Physics Q/As for the casual reader

How does Tip Path influence loop shape? Paul, I would modify that to ask, 'How does the Tip Path from RSP0 to RSP1 influence the initial loop shape?" Loop morph will have a big effect on the loop shape as it propagates. A related question would be "How does the tip path from RSP to MCF influence th...

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