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Search found 477 matches

by Dirk le Roux
Wed Sep 02, 2020 11:37 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: 1621

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

A favourite of mine over the last few months have been John Goddard's "half-a-backcast". The way I do it is like a sideways-starting Belgian PUALD cast emphasizing backcast laziness. It feels like before you "go" on the forward cast, the line simply sits up in a wide, airborne arc. Apart from its ob...
by Dirk le Roux
Tue Sep 01, 2020 12:16 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

Those errors produce steps that raise hell with the spline smoothing routine I use and produce the wiggles you are showing. I hope those stitching errors were fixed in the retro loop 2 data that I sent you. Hi Gordy Though the loop 2 data is smoother, I suspect that your persistence with jumps betw...
by Dirk le Roux
Sun Aug 30, 2020 6:31 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

By change in velocity I assume you are talking about acceleration and not the derivative of the acceleration which is jerk. Hi Gordy I used "change in velocity" based on your "the timing for how the velocity of the fly leg is affected by a change in the rod leg velocity". However, the two legs' vel...
by Dirk le Roux
Sat Aug 29, 2020 10:10 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

Hi Gordy That complicates the timing for how the velocity of the fly leg is affected by a change in the rod leg velocity. It could well take a model to give some insight as to the actual timing for the increase in the fly leg velocity for a given pull back velocity variation. My measured data says t...
by Dirk le Roux
Sat Aug 29, 2020 7:00 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

Would you agree that there is a noticeable delay for the fly leg's velocity to start increasing relative to when the rod leg's velocity starts going negative? Hi Gordy I understand what you were driving at. I agree that there is a noticeable lag between when the rod leg starts going negative and wh...
by Dirk le Roux
Fri Aug 28, 2020 8:58 am
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

Have you digitized the retro loop data yet? The more data we have to compare the better. OK, first I zoomed in to where the action was, looking at the 1-frame interval traces in your file: Gordy's-retro-loop-prop-data.jpg I roughly drew simplified straight-line interpretations (black dotted lines) ...
by Dirk le Roux
Wed Aug 26, 2020 9:02 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

Hi Gordy It seems you have begun to see the issues around jumping from tracking the stationary rod tip to a falling line marker, and from two line markers to the fluttering fly. In my experience, the data from line markers is more comfortably consistent. It is when we jump between tracking different...
by Dirk le Roux
Wed Aug 26, 2020 4:37 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

That is what Tracker says about the digitized values for the rod tip. Hi Gordy In and out. The problem with your base data is not so much the noisy digitisation, but that you jumped from one marker to the next on the same tracks. Being in different positions in space, and different things (rod tip ...
by Dirk le Roux
Tue Aug 25, 2020 9:59 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

Hi Gordy I assumed you misnomed as you clearly showed negative rod leg "speed" on the same chart. So you use negative rod leg "speed" values, by dint of some math tricks to calculate a loop travel speed, which by definition can't be negative. But it's OK that the rod leg speed is negative because yo...
by Dirk le Roux
Mon Aug 24, 2020 7:38 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5948

Re: The Triple or Check Haul

That expected loop speed value does not go negative as it did before just using the x velocity values. Hi Gordy It is a good thing that your re-worked curves now yield a non-negative loop travel velocity, in line with observation. However, if we are still talking about the same cast, the time of th...

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