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Search found 1372 matches

by gordonjudd
Sat Aug 29, 2020 11:15 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

Here are the x velocity curves that were used to produce the above acceleration curves. You can see it does not take much of a wiggle in the velocity to produce a relatively big change in the acceleration values.
Image
Gordy
by gordonjudd
Sat Aug 29, 2020 10:44 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

Here, I believe the evidence supports that I am still in the clear in saying that a change in rod leg velocity is surprisingly instantaneously accompanied by a change in the fly leg velocity. Dirk, I am not following your argument. By change in velocity I assume you are talking about acceleration a...
by gordonjudd
Sat Aug 29, 2020 8:26 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

I understand what you were driving at. I agree that there is a noticeable lag between when the rod leg starts going negative and when the fly leg actually starts positively accelerating. Dirk, Its good that we now agree (at least I think we do) that it takes some time for the increased acceleration...
by gordonjudd
Sat Aug 29, 2020 7:50 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

Merlin, What is the mechanism that causes your model to start deviating from the WEE model at about the time the tension start to have different values? Fine checking the model made me realize that there are unfortunately issues in three papers from Caroline & Noel I have a limited number of fly vel...
by gordonjudd
Fri Aug 28, 2020 8:10 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

I made an own trace of single markers on the rod- and fly legs respectively: Dirk, Thanks for taking the time to analyze the velocity values in that retro loop video. I think we are getting the same nominal values now. https://imagizer.imageshack.com/img923/5531/tpWspd.jpg Would you agree that ther...
by gordonjudd
Thu Aug 27, 2020 2:17 am
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

The evidence speaks for itself once you have less broken data.
Dirk,
Have you digitized the retro loop data yet? The more data we have to compare the better.
Gordy
by gordonjudd
Wed Aug 26, 2020 8:14 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

The problem with your base data is not so much the noisy digitization, 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 vs. line, line vs. fly), these markers' motion have subtle differences which get amplified ...
by gordonjudd
Tue Aug 25, 2020 11:24 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

Does the rod tip really start pulling back when your treated data says it does? That is what Tracker says about the digitized values for the rod tip. My treated data just smooths out the digitization noise. The spline fit data follows the same marker vs time paths and thus should give meaningful (c...
by gordonjudd
Tue Aug 25, 2020 10:36 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

Why are you working with speeds Gordy? Graeme, I am just trying to convert 2-D velocity data to better fit with Merlin's 1-D model. If you integrate the just the x-velocity data to get a travel distance you will come up short since much of the time those points have a sizeable y variation. The loop...
by gordonjudd
Tue Aug 25, 2020 1:38 pm
Forum: Flycasting Physics
Topic: The Triple or Check Haul
Replies: 72
Views: 5733

Re: The Triple or Check Haul

It is a good thing that your re-worked curves now yield a non-negative loop travel velocity, Dirk, These are speed values not velocity. By definition the speed cannot go negative because we are taking the sqrt(sum of squares) to arrive at a speed value. These markers are moving in different directi...

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