Line configuration affect on rod

[gordonjudd]

then W1 =1/2 F*x1 and W2=1/2 F*x2.

Merlin,
It is probably a typo of some sort but I get x1=F/k1 and x2=F/k2. Thus W1=1/2*k1*(F/k1).^2 and W2=1/2*k2*(F/k2).^2. Consequently W1=\(1/2*F^2/k1\) and W2=\(1/2*F^2/k2\) .

Result remains the same, i.e. W2>W1.

However a key parameter is the “loaded” speed of the rod and that involves rod action somewhere. Faster rods are more on the tip action side and can remain faster under load by comparison to softer / butt action rods. This influences tip speed.

Agreed. I suspect the faster unloading of the higher frequency rod is the primary reason it produces more tip speed.

Gordy

[Stoatstail50]

My adjustments are based on the way my loops look.

Mine too.

[George C]

Thank you, Merlin.
I appreciate your patience and insight.
George

[Torsten]

Hi Paul,

Merlin/Gordy were faster, alternatively you can derive it this way:

PE= 1/2 * k * x^2 combined with
Fs = -k * x (Hooke's Law)

-> x = - Fs / k
-> PE = 1/2 * Fs² / k

and this means if we assume Fs (the load) is constant

PE ~ 1 / k

PE is inverse proportional to k

Ah yes. Because PE= 1/2 k.x^2 ?

[Lasse Karlsson]

I never thought so much thought went into this. My adjustments are based on the way my loops look. I really am a “simple man”

Mine too, but mostly just the look of my flyleg

[Merlin]

Gordy

The relationship is the same
W=1/2 F^^2 /k
W= 1/2 F F/k
W= 1/2 F x

Merlin

[Merlin]

Hi Paul

I guess the broomstick was short.
Comparisons are always arguable. Does an HT12 feels lighter than an HT6?

Merlin

[Paul Arden]

Hi Merlin, if we take a 7WT line for example then yes.

Cheers, Paul

[Merlin]

Then can someone explain that, I just can’t

Merlin

[Paul Arden]

I think Gordy explained it quite well a few years ago, that the softer rod allows us to put more force in (to a given arc). This in turn alters our feeling of weight. His calculations at the time were that a flexible rod compared to a broomstick allowed us to double the amount of force we can input.

It’s a very easy test to do. We know it’s also happening in the world at large, because many casters use heavier lines than the rod suggests, but they could equally use softer rods to get the same feeling of weight with a given line that they want or expect.

A six weight line on a two weight rod will feel very heavy. But put that line on a 12WT rod and it will feel very light. This is despite the 12WT rod being much heavier than the 2WT rod and the flyline being the same in both instances.

Cheers, Paul