60% of the line diameter it writes. Is this really relevant?
My flyline tips vary from SH #5 0,75mm to DH #12 1,3mm.
60% of 1,3mm is 0,78mm. But 0,55mm is the butt diameter of all LCalc formuals I found for DH. The 75% butt diameter mentioned makes this even more peculiar.
I read that material stiffness is to take in to consideration. And maybe flyline and leader materials changed over time?
The numbers make better sense in smaller flyline diameters. But still many formulas span across 4-5 AFTM classes. Showing little connection to this "60% rule".
I looked up this book on the Internet. It looks very interesting. I better read it. Maybe this is considered a "fly fishermans bible"? But I can not see that the 60% connection to butt diameters applies. And therefore; is this really relevant to us?
Maybe there is something I don't fully understand? I'd love to get my grips arund this matter, simply because I tie leaders.
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