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Search found 1267 matches

by gordonjudd
Fri Jan 10, 2020 6:00 pm
Forum: Flycasting
Topic: Pull the line first.
Replies: 64
Views: 965

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: 7
Views: 294

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...
by gordonjudd
Thu Nov 07, 2019 3:32 pm
Forum: Tackle
Topic: Suggested method for measuring lines
Replies: 19
Views: 1809

Re: Suggested method for measuring lines

It is not unusual that ovalization is more than 5% Esa, How does an ovalization of 5% translate to the ratio of the maximum diameter to the minimum diameter? If you assume that results in the maximum diameter is being the 1.025 times the diameter of of a round cross-section and the minimum diameter...
by gordonjudd
Tue Nov 05, 2019 4:52 pm
Forum: Tackle
Topic: Suggested method for measuring lines
Replies: 19
Views: 1809

Re: Suggested method for measuring lines

the different casting feel seems to correlate with the centre of mass of the modern line being further from the rod tip and/or spread over a much longer length of line. I am a very moderate caster and an expert caster might have had a different experience. Kevin, Thanks for giving more details abou...
by gordonjudd
Tue Nov 05, 2019 3:57 pm
Forum: Flycasting Physics
Topic: Counterflex, energy loss and absorbation
Replies: 11
Views: 2650

Re: Counterflex, energy loss and absorbation

To perform the calculation, you need to describe the linear mass along the shaft, and the velocity of each point of the shaft. The usual simplification is to consider the deflection as a guideline for speed. You do not need to know the exact value of speed, but only its evaluation by comparison to ...
by gordonjudd
Sun Nov 03, 2019 5:05 pm
Forum: Flycasting Physics
Topic: Counterflex, energy loss and absorbation
Replies: 11
Views: 2650

Re: Counterflex, energy loss and absorbation

We can measure the sum of equivalent masses (MOI) and the tip one (mo) just as you show with the frequency curves. Merlin, So does the equivalent mass (mo) value we get from the frequency vs tip mass curve represent the sum of the equivalent mass values of the butt, mid, and tip section? Could the ...
by gordonjudd
Sat Nov 02, 2019 3:58 pm
Forum: Flycasting Physics
Topic: Counterflex, energy loss and absorbation
Replies: 11
Views: 2650

Re: Counterflex, energy loss and absorbation

Remember there are 3 equivalent masses (butt, mid, tip) and that one of the objective of the design is to maximize the transfer part of kinetic energy (mid equivalent mass), and minimize the two others. Merlin, How do you determine the mo values for the butt and mid sections? I assume the mo for th...
by gordonjudd
Thu Oct 31, 2019 4:10 pm
Forum: Tackle
Topic: Suggested method for measuring lines
Replies: 19
Views: 1809

Re: Suggested method for measuring lines

I have two lines, one old one, with a level "long belly" of 43 feet and a short back taper; the other modern one, with a 58 foot head, including a very gradual 20 foot back taper - the heads of both weigh essentially the same (16.2-16.5 gram) Kevin, What length of line was included in your mass mea...
by gordonjudd
Mon Oct 28, 2019 7:48 pm
Forum: Tackle
Topic: Suggested method for measuring lines
Replies: 19
Views: 1809

Re: Suggested method for measuring lines

Perhaps diameter measuring is good enough for our purpose but the lines I have measured diameters have been oval Esa, How much difference have you found between the cross-section area found for A= pi*min_dia*max_dia/4 of an oval cross-section vs the minimum (or maximum) dia.^2/4? I suspect the diff...
by gordonjudd
Mon Oct 28, 2019 3:33 pm
Forum: Tackle
Topic: Suggested method for measuring lines
Replies: 19
Views: 1809

Re: Suggested method for measuring lines

but it effects weight because line densities are not constant Esa, In this description of Rio's agent X approach to get the tip of a floating line to float at .http://burfish.com/catalog/agent_x.html they note: . Most floating fly lines use hollow micro-spheres mixed into the coating to achieve a s...

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