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The velocity B will be a combination of A plus the lever-length magnified result of the force produced by the lever weight.

Two issues need to be dealt with. For purposes of precise calculation one must deal with the complicated question of what the actual CHORD length is for the lever IF one has a precise value for FORCE or ACCELERATION. We have neither, precisely, yet. For purposes of the model, and because the only functionally simple measurement a layman can make is shortening…I am going to define lever length as the vertical distance from the top of the handle (rotating force point) to the highest point of the rod tip as the rod passes vertical. This potentially MODELS most closely and simply to hanging a weight on a horizontally stabilized rod to reproduce realistic actual casting flexion. More about that below.

The second issue is the rotation point of the rod-lever. Some have modeled it based on the elbow fixed point (shades of trout casting holding a bible under ones elbow………a teaching device promoted for decades in the deep past). Clearly it is not that in SW casting. And clearly it is moving…as is mine above, forward in a constant plane….and clearly it is complicated. What is not clear is whether there are any mechanical implications, other than, maybe, for precise calculation. So I am going to ignore that for now.

The final factor to be dealt with is Force. My force my be a more or less constant, cast to cast, when throwing for distance…but that will differ from individual to individual. Even that statement assumes that the MASS remains constant.

As in the discussion of hammer handles and throwing sticks, individual strength differences for lever devices are averaged out all the time. Let some swing them harder, let some choke up or use some other personally adjusted hand position to vary lever length. But we can, by a variety of means, arrive upon some standardized, averaged working measure of Force.

Rather than settle on one single Force across the board, I would further investigate the potential variation in Force as a function of MASS. That is, at least ask and then measure whether the isometric differences in muscle with respect to velocity (limited) and static strength (limited) enable a difference AVERAGE force for, say, an 8 weight or a 12 weight, and consider a different F for each line weight.
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