After your post I read up on Grant and he was quite a character, probably worth a book in his own right. I suspect it was power and tip speed, together with an innate understanding of the efficiency of the transfer of power between the rod and line. It would be interesting to find out if he understood why he could produce these casts or if he just could.

i doubt we will ever know now, the rod he used was like William Wallace's sword, they say a normal man can't lift it

Endrick, he was probably capable of rotating the rod really quickly during the last stage of the cast, until the rod unloads the tip speed is related to leverage. Perhaps he had a natural ability to match the speed he was able to rotate the rod with the rods natural frequency as well?

Frank

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Frank Williams APGAI

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this is what i understand to be the casters use of frequency, it would be interesting to know, although difficult achieve with absolute precision, if this is all there is too it.

I've been thinking about this for a few days and will offer an explanation to the original question as I think the answer is in parts all over the place in this thread.

If we take the question to read "what rod/line factors contribute to a high line velocity from the rod on release"

I would say there are 3 major factors - Wide tip deflection, high resonant frequency & a critical damped rod line combination.

Resonant frequency and tip deflection are functions of action angle, Action angle is determined by material stiffness ( modulus), construction and taper of the rod.

Critical damping is much more difficult to characterise as it is a function of the input (cast), rod and line but the ERN should give you a ready point of reference to start selecting an appropriate line.

Happy to be shot at, its been a long week