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Two heads cast at the same time

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Paul Arden
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Re: Two heads cast at the same time

#231

Post by Paul Arden » Thu Apr 01, 2021 4:11 pm

Hi Martin,

I don’t know. But I remember years ago seeing video animations of the loop unrolling without air drag taken into account. They unrolled but not very nicely (this could have been the programming) and then they all kicked quite considerably. I would think there would be an acceleration as the loop unrolls but this might be debatable! :D

I’ll leave the rest for others to answer :cool:

Cheers, Paul
It's an exploration; bring a flyrod.

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Torsten
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Re: Two heads cast at the same time

#232

Post by Torsten » Sat Apr 10, 2021 9:31 pm

Here is a possible example, currently only a level line, with gravity but without air drag. I'll see that can I extend this model with your parameters, Martin.
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troutcontrol
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Re: Two heads cast at the same time

#233

Post by troutcontrol » Thu Apr 15, 2021 4:25 pm

Unbelievable!
THX!!!

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gordonjudd
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Re: Two heads cast at the same time

#234

Post by gordonjudd » Fri Apr 16, 2021 1:59 pm

Here is a possible example,
Torsten,
Good to see that you are continuing to work on your loop model. Does this include an estimate for the line stiffness?

That seems to be the missing link in being able to match the shape you get with a length of fly line in the string shooter. Professor Hanna is still looking for a grad student to take on that challenge.

When you add drag I will bet the line fall rate will be reduced as well. That loop shape should have some net positive force due to form drag.

Gordy

Torsten
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Re: Two heads cast at the same time

#235

Post by Torsten » Fri Apr 30, 2021 9:17 pm

Hi Gordy,
Does this include an estimate for the line stiffness?
It's on the TODO list - first I'll extend the data model for the line taper and then follows aerodynamics and line (bending) stiffness.
I hope to find a few hours this weekend.

Torsten.

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James9118
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Re: Two heads cast at the same time

#236

Post by James9118 » Mon May 03, 2021 7:14 pm

gordonjudd wrote:
Fri Apr 16, 2021 1:59 pm


When you add drag I will bet the line fall rate will be reduced as well. That loop shape should have some net positive force due to form drag.

Gordy
It will change the fall rate in the same way as a brick falls slower in air than it does in a vacuum, however we all know that fly lines don't generate lift.

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