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Search found 1382 matches

by gordonjudd
Sun Jan 17, 2021 5:59 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

Here is what Grunde said: "I measured hauling speed many years ago and peak haul speed is usually very close to max rod load (and max rod rotation)." Bernd, If Grunde was referring to the study of haul timing that he participated in with Ulrik Röijezon, then it appears that "very close" involved a ...
by gordonjudd
Sun Jan 17, 2021 5:36 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

Below you can find the rod elastic energy history along the timing of the haul. Merlin, How are you calculating the elastic energy in the rod? Is it based on the perpendicular tip deflection and the spring constant of the rod (i.e. k1*x.^2/2 + k3*x.^4/4) or on the curved shape of the rod along with...
by gordonjudd
Sat Jan 16, 2021 4:19 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

I think on these shorter casts we often haul to or even through RSP.
Paul,

Does that imply that the longer the cast the earlier the haul should be?

Gordy
by gordonjudd
Sat Jan 16, 2021 1:03 am
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Q

I don't think we can for example match max possible line speed of the line thru the guides and max tip speed to happen at the same time. Does that make sense to you? Bernd, I don't see why you could not do just that since it comes down to a matter of timing between the actions of the two hands. Eve...
by gordonjudd
Fri Jan 15, 2021 6:25 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

The record data I use correspond to the speed relative to the stripping guide, Gordy can confirm if I fool myself or not on this point. Merlin, The primary constraint in looking at the relative velocities is that the length of line from the hauling hand to the fly remains constant. Thus since the l...
by gordonjudd
Thu Jan 14, 2021 6:53 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

While the rod tip acts as a pulley post MCL it also does so at any time that the rod is not directly pointing down the line IMO. and how can the rod tip per se act as a pulley post minimum chord length = during straightening? Bernd, That pulley reference was a quote from Paul so I am not the one to...
by gordonjudd
Thu Jan 07, 2021 5:12 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

I will see if I have some haul velocity data on one of Paul's casts to get an idea of how much delay there is between the peak of the acceleration of the haul and the peak of the haul velocity. Here are measured haul acceleration and haul velocity plots for one of Paul's delivery casts. https://ima...
by gordonjudd
Thu Jan 07, 2021 3:45 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

Here is a record of your hand speed and acceleration for a 170 cast: Merlin, Do you have a similar record of the haul speed and haul acceleration Paul uses for a distance cast? As we know the hand or hand separation speed is not the same as the haul speed because of the effect of the rod rotation on...
by gordonjudd
Tue Jan 05, 2021 5:16 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

a gentle long one ending with a short quick one at the very last moment. Merlin, Because of the loaded frequency of rod it has a fairly long response time to short impulse-like changes of the haul. Thus I don't think a quick increase in the acceleration of the haul will have a one to one effect in t...
by gordonjudd
Mon Jan 04, 2021 6:19 pm
Forum: Teaching
Topic: Maximum Rod Bend
Replies: 90
Views: 1741

Re: Maximum Rod Bend

While the rod tip acts as a pulley post MCL it also does so at any time that the rod is not directly pointing down the line IMO. Paul, An even more accurate model would look at the rod tip as a pulley that in turn is attached to a spring. The addition of the spring will produce more line speed as co...

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