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Search found 12 matches

by DragginFly
Fri Jan 04, 2008 3:24 am
Forum: Tackle
Topic: Rod frequency vs. mass on tip
Replies: 212
Views: 32036

ERN=8,5 AA=72 NF=3,35hz Tipspeed 20cm amplitude=3,86m/sec. 40cm amplitude=6,89m/sec. 60cm amplitude=11,95m/sec. (Optical sensors placed at RSP with 20mm distance.) I'm using the approximation of the tip speed (harmonic oscillator): v_max = 2 * pi * d * f 0.2m -> v_max=4.2 0.4m -> v_max=8.4 0.6m -> ...
by DragginFly
Tue Dec 25, 2007 10:52 pm
Forum: Tackle
Topic: Rod frequency vs. mass on tip
Replies: 212
Views: 32036

Let me comment, but I will be the first to admit I really don’t understand the application of acceleration relative to fly rods. I hope you can educate me. Although I understand the concept of “accelerate to...”, I do not comprehend what you mean when you say “accelerate at ...”. And, yes, I do con...
by DragginFly
Tue Dec 25, 2007 2:08 pm
Forum: Tackle
Topic: Rod frequency vs. mass on tip
Replies: 212
Views: 32036

Without weight Rod 1: 2.75 Hz (165 CPM) Rod 2: 2.88 Hz (172.8 CPM) Exactly the same as before - difference - 4.8% (on computer reading) With Weight Rod 1: 1.40 Hz (84.00 CPM) Rod 2: 1.47 Hz (88.20 CPM) Difference 5% (on computer reading) The % differences loaded and unloaded were essentially the sa...
by DragginFly
Mon Dec 24, 2007 2:58 pm
Forum: Tackle
Topic: Rod frequency vs. mass on tip
Replies: 212
Views: 32036

I've done some interesting experiments on a handful of rods. 1'st mode frequency of some rods vs. mass attached to the tip: The rods where mounted horizontally and the mass added to the tip is just "tack on". The frequency is measured by counting cycles with a stop watch. I think it's int...
by DragginFly
Sun Dec 23, 2007 6:37 am
Forum: Tackle
Topic: Rod frequency vs. mass on tip
Replies: 212
Views: 32036

I know a fellow who several years ago argued that IP should be expressed in grams instead of ERN. One of the nice things about metric units is that it is quite easy to translate the weight needed to bend a horizontal rod to the acceleration of a given mass of line needed to bend the same rod when i...
by DragginFly
Sun Dec 23, 2007 6:19 am
Forum: Tackle
Topic: Rod frequency vs. mass on tip
Replies: 212
Views: 32036

Hi DragginFly. Don`t forget that the rod is tapered. The stiffness and mass changes along the rod so that equation is not the best to use. But I suppose that`s not your point either. :) Quite right Tom. I did not want to get into the intricacies of non-linear systems nor for that matter of driven s...
by DragginFly
Fri Dec 21, 2007 10:43 pm
Forum: Tackle
Topic: Rod frequency vs. mass on tip
Replies: 212
Views: 32036

Any chance that you can find out (as John and Magnus allready says) if the difference in frequency relates to mass or stiffness - distribution? (Or both for that matter.) According to the text book and wikipedia : w = sqrt ( k / m ) where: w (that should be a lower case omega) is angular frequency ...
by DragginFly
Tue Dec 18, 2007 10:18 pm
Forum: Tackle
Topic: Quantifying Rod Feel - Neurobiology,Tests and Numbers
Replies: 93
Views: 11235

Frequency:If we have two rods with exactly the same stiffness-distribution,mass-distribution and lenght (oscillating lenght) would we all agree to that these two rods would feel the same? Tom. Isn't there one other factor - Damping. I think this might be what Paul calls Bounce. With zero damping th...
by DragginFly
Fri Dec 14, 2007 9:47 am
Forum: Tackle
Topic: Quantifying Rod Feel - Neurobiology,Tests and Numbers
Replies: 93
Views: 11235

Being a geek I find this kind of exercise almost as much fun as fishing. Feel is of course subjective but I think it is possible to quantify certain characteristics of a rod that can be matched to individual preferences. To get the ball rolling I hypothesize that for a given rod/reel/line combinati...
by DragginFly
Wed Oct 12, 2005 5:20 pm
Forum: Tackle
Topic: Balance, Momentum and Objectivity - Objective Balance
Replies: 131
Views: 13295

Well, can any one disprove the initial post of this thread about balance and momentum? If so speak now or forever hold you piece. FL Frank You said in your initial post: "To balance a fly rod and line simply means one force counteracting the effect of another force, this is the definition of b...
by DragginFly
Mon Sep 19, 2005 9:41 pm
Forum: Tackle
Topic: CCS, Oh no! - More CCS
Replies: 430
Views: 40588

Bill Even with no load applied the rod tip sags below the horizontal due its its own weight. This can be seen in Erics graph where with no loading he still has about 2.5 inches of deflection. So by doubling this deflection you are simulating adding the rods own weight as if it were all applied at t...
by DragginFly
Mon Sep 19, 2005 7:12 pm
Forum: Tackle
Topic: CCS, Oh no! - More CCS
Replies: 430
Views: 40588

Any thoughts about how to establish a measure for swingweight? We've argued about this before and I don't think there were any real conclusions. Maybe its as simple as fix the reel seat in a hinge and a spring balance to the tip. Just coming in here with my two CCs worth. One way to measure swing w...