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Search found 1372 matches

by gordonjudd
Tue Sep 22, 2020 3:44 pm
Forum: Flycasting Physics
Topic: Analysing loop propagation
Replies: 202
Views: 5925

Re: Analysing loop propagation

when it's really only falling at a similar rate to the upward propagation of the wave Graeme, The problem with that argument is that initial +y velocity of the loop's launch will result in a linear increase in its height while gravity will produce a quadratic decrease. Thus just as with cannon ball...
by gordonjudd
Wed Sep 16, 2020 10:34 pm
Forum: Flycasting Physics
Topic: Shooted cast
Replies: 74
Views: 3190

Re: Shooted cast

I read again the study performed by Ulrik and Grunde three years ago, and max haul speed for a competition cast with trout tackle and MED5 was in the 8 m/s to 12 m/s range. Merlin, Ulrik was instrumented to measure the speed between the haul hand and the rod hand rather than the actual speed of the...
by gordonjudd
Tue Sep 15, 2020 2:19 pm
Forum: Flycasting Physics
Topic: Analysing loop propagation
Replies: 202
Views: 5925

Re: Analysing loop propagation

Is this a loop or a wave? Graeme, For lack of a better term I would say it is an example of one of the many different shapes you see in a "fly wave." It has a different shape than the "whip wave" that Dr. McMillan analyzed. However in both cases the mass of the medium is transported as the wave pro...
by gordonjudd
Mon Sep 14, 2020 3:08 pm
Forum: Flycasting Physics
Topic: Analysing loop propagation
Replies: 202
Views: 5925

Re: Analysing loop propagation

A jerk is readable in Gordy's pull-back cast rod leg velocity and at the same time an opposite direction jerk is readable in the fly leg velocity - centripetal force explains it for me. Dirk, Not only is it readable, the jerk derived from the measured velocity profiles in that pull back cast can be...
by gordonjudd
Sun Sep 13, 2020 4:29 pm
Forum: Flycasting Physics
Topic: Analysing loop propagation
Replies: 202
Views: 5925

Re: Analysing loop propagation

of course you can use a ODE solver for predicting the fly velocity. My model is somewhat similar but more complex as I'm using a system of partial differential equations and a solver for nonlinear differential systems. But this is another topic. Paul, I could not find the examples of the loop morph...
by gordonjudd
Mon Sep 07, 2020 4:43 pm
Forum: Flycasting Physics
Topic: Shooted cast
Replies: 74
Views: 3190

Re: Shooted cast

Magnitudes are greyed due to unknown fps on the file downloaded from Vimeo.
Dirk,
Those videos used a frame rate of 210 fps.
Gordy
by gordonjudd
Mon Sep 07, 2020 4:00 pm
Forum: Flycasting Physics
Topic: Shooted cast
Replies: 74
Views: 3190

Re: Shooted cast

Max haul speed was roughly halfway between MCL and RSP Dirk, Did you compute the haul speed by taking the derivative of the distance between the stripper guide and the haul hand? That is the way to measure the effect that the haul has on line speed. As pointed out by Grunde many years ago, the haul...
by gordonjudd
Mon Aug 31, 2020 2:31 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 4878

Re: The Triple or Check Haul

Gordy, one cannot compute that in the loop frame. Merlin, I should have said "Would the skin drag forces be symmetrical (and hence cancel out in the vertical direction). Lingard did get a contribution from skin drag in the horizontal direction. However it is much smaller than the form drag value. I...
by gordonjudd
Sun Aug 30, 2020 9:55 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 4878

Re: The Triple or Check Haul

If you don't mind, I'd rather use your data from the file you sent me some days ago, Dirk, That data came from markers that had different slopes in the marker paths and I also made some sign errors in the stitching process. Those errors produce steps that raise hell with the spline smoothing routin...
by gordonjudd
Sun Aug 30, 2020 6:45 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 4878

Re: The Triple or Check Haul

• In the paper about drag affecting loop, the expression of the horizontal drag force is wrong since it does not contain the skin drag contribution (skin drag forces are not symmetrical). Daniel, Would the skin drag forces be symmetrical (and hence cancel out in the horizontal direction) in a loop ...

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