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Quick off the cuff video discussing the AFTM system for measuring Fly Lines relative to Line Wt. Class. What is the system? What information does the AFTM system provide? Is that information currently relevant in the industry?
AFTM reads as follows:
A uniform 6wt line 30ft long, should weight 160gr.
Which can be written as:
The Volume of a cylinder x the Density = Mass
(Pi x r^2 x h) x p = M
r^2 = M / (Pi x h x p)
Thus, because M is provided by the table to standardize the increments between line class, and the Density is provided by the Line Manufacturer depending on the desire sink rate, the Table is only useful in outputting the Dia. of a given line class, NOT what the suggested head weight is for loaded rods within a rod class.
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