Not sure where you're trying to take this. Diameter and thickness affect moment of inertia and bulk modulus (stiffness) at any point on the rod - increasing either or both increases the stiffness of the rod at that point - it of course increases the weight at the same time, though what's usually considered is the cross section needed for adequate strength in the rod.
A progressive taper is going to be lighter in the tip and possibly much heavier in the butt, while a para taper rod is going to be comparatively lighter in the more narrow butt section and more mass in the somewhat thicker tip. In general, para works and feels better in shorter rods, while progressive is the stuff of longer rods. Your mileage may vary in Yorkshire, because the Brit tradition is long para rods. Also, good progressive rods in short length is the exclusive territory of glass.
Last edited by bulldog1935 on 14 Apr 2021, 08:18, edited 1 time in total.
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