Re: A week with Way Yin (aka Bubba)
Posted: Fri Oct 22, 2021 6:14 pm
Tom, if there is something I can try to clarify, please don't hesitate to ask or PM.
As I was mulling, I realized I should have added a sentence or two to the paragraph on "constraints": Of course on a Spey backcast, the entire line does have rearward velocity (the whole kit and caboodle is moving rearward) but there is mechanical inefficiency in capitalizing on all of this momentum for loading the rod on the forward cast. Although surface tension on the end of the line ("grip", "anchor" or whatever we want to call it) adds efficiency (if there was no grip, it would be like trying to make an overhead cast with your backcast loop only halfway unfurled), changing directions of the cast at the moment the grip forms provides you only a portion of the mass of line (a bit more than half, given most line's taper profile) to use for loading, since there is little resistance in the backcast loop. That is, force applied towards forward cast is "eaten up" by the backcast loop being present. If the line was rigid at this moment however, I believe efficiency could approach an overhead cast.
I believe the physics guys on the forum could explain far better than I with elegant mathematical equations - it must be simple Newtonian laws of motion that apply!
Paul, would love to check out your scene. Something to look forward to! Thank you all for having me back on the Forum.
As I was mulling, I realized I should have added a sentence or two to the paragraph on "constraints": Of course on a Spey backcast, the entire line does have rearward velocity (the whole kit and caboodle is moving rearward) but there is mechanical inefficiency in capitalizing on all of this momentum for loading the rod on the forward cast. Although surface tension on the end of the line ("grip", "anchor" or whatever we want to call it) adds efficiency (if there was no grip, it would be like trying to make an overhead cast with your backcast loop only halfway unfurled), changing directions of the cast at the moment the grip forms provides you only a portion of the mass of line (a bit more than half, given most line's taper profile) to use for loading, since there is little resistance in the backcast loop. That is, force applied towards forward cast is "eaten up" by the backcast loop being present. If the line was rigid at this moment however, I believe efficiency could approach an overhead cast.
I believe the physics guys on the forum could explain far better than I with elegant mathematical equations - it must be simple Newtonian laws of motion that apply!
Paul, would love to check out your scene. Something to look forward to! Thank you all for having me back on the Forum.