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Search found 1275 matches

by gordonjudd
Wed Feb 12, 2020 4:08 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 51
Views: 3614

Re: The Whip Effect

Maximum speed of the cast is slightly above 60 m/s,close to Gordy’s measurement, and cancelling the inertial effect drives this speed down by more than 25% which is huge. Merlin, I am impressed with the match of the tip path predicted by your model with the measured data. Here is the video of that ...
by gordonjudd
Fri Feb 07, 2020 3:48 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 51
Views: 3614

Re: The Whip Effect

I was wondering how much percentage of the rod bend comes by the air resistance especially against the fly line. Bernd, I don't know how you would compute the added bend in the rod that is due to air resistance. Calculating the varying resistance force due to form drag on different parts of the rod...
by gordonjudd
Thu Feb 06, 2020 5:48 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 51
Views: 3614

Re: The Whip Effect

I think that the explanations are reasonably simple. Maybe we need to just talk about the whip. I.e. how this energy travels up through the rod. Would you regard it as being a wave? Paul, I cannot see that there is a wave like energy flow from the rod to the line; so as generally is the case, simpl...
by gordonjudd
Mon Feb 03, 2020 5:07 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 51
Views: 3614

Re: The Whip Effect

In my video 'COAM' is not used at all. Tobias, Which video are you referring to? COAM seems to be a central tenet in a number of your videos on Vimeo. https://imagizer.imageshack.com/img923/4636/NgfxlL.jpg I would still like to understand how you are calculating the composite angular momentum of a ...
by gordonjudd
Sun Feb 02, 2020 5:01 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 51
Views: 3614

Re: The Whip Effect

But for a whip - see the picture above and the adapted red circle - it is not questioned, that a 'center or the rotating mass' exist, isn't it ? Tobias, I don't think the moving mass in the rod is following a path that has anything to do with your red circle for the propagating loop in a whip. In a...
by gordonjudd
Sat Feb 01, 2020 5:59 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 51
Views: 3614

Re: The Whip Effect

Given the limited capabilities of Excel and the complexity of calculating a number of individual rotation speeds corresponding to an equivalent number of small pieces of a rod, Merlin, I would agree that calculating the K.E. of a short section of a rod would be a can of worms since each section wil...
by gordonjudd
Fri Jan 31, 2020 10:38 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 51
Views: 3614

Re: The Whip Effect

For an SH graphite rod, the speed effect is small, it is significant for a DH rod, and even much more for a cane rod. Merlin, So is the whip effect associated with the K.E. of the rod that in turn is related to the rod's mass-in-motion rather than a re-distribution of its angular momentum? I don't ...
by gordonjudd
Thu Jan 30, 2020 10:41 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 51
Views: 3614

Re: The Whip Effect

it tries to give a more differentiated view on the redistribution of angular momentum. Tobias, How are you calculating the angular momentum of a flexible rod? Since different 5cm sections of the rod would have different moments of inertia and angular velocities I would think the composite angular m...
by gordonjudd
Fri Jan 10, 2020 6:00 pm
Forum: Flycasting
Topic: Pull the line first.
Replies: 64
Views: 2059

Re: Pull the line first.

And Paul’s much faster one Paul, I get the joke, but I was surprised to find that your peak haul speed on the forward cast was closer to MAV while Lasse's was closer to RSP1. Thus the timing of the peak of the haul speed (and/or peak acceleration) may be quite forgiving. As Bernd explained the timi...
by gordonjudd
Wed Jan 01, 2020 5:09 pm
Forum: Flycasting
Topic: Technical tarpon line
Replies: 8
Views: 567

Re: Technical tarpon line

Incidentally if the can make lines to the upper end of the tolerances then I can’t think why they don’t just make them bang on. Paul, They could but want to maximize the distance you can cast for a given line weight. If you found that you could cast a Rio 10 wt line 10 feet farther than one whose m...

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