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Adding 1 more. This is the same as the previous run with the addition of constant upward translation motion of 1 m/s. This time peak speed is reached after 0.5 seconds (rod has rotated 45 degrees).

Hi Walter

FWIW here are the speed profiles for a 170 forward cast from Paul. Maybe you could take inspiration from these data to define your scenarios: Merlin

Thanks Daniel.

Just to make sure I’m reading that correctly the rotation rate of the rod goes from 0 to 16 radians/sec (roughly 150 rpm) in just over .2 seconds?

Correct Walter. That is about 900 deg/s in a very short time, typical of a competition cast.

Merlin

Thanks Daniel,

This is just preliminary since I've only used a single stage acceleration, and had to guess some of the angles and acceleration rates so you can see that haul distance is excessive but here is what I get for the period from 0.6 seconds to 0.9 seconds in that cast.

There is something like a factor 2 by comparison with the record. Could you please plot speeds (rotation, translation and line hand).

Many thanks in advance

Merlin

Hi Daniel,

Is translation speed a measure of the horizontal, linear velocity of the hand on the forward delivery cast?

Thanks in advance,


John

Merlin wrote: ↑Fri Mar 29, 2024 9:42 pm There is something like a factor 2 by comparison with the record. Could you please plot speeds (rotation, translation and line hand).

Many thanks in advance

Merlin

I made some adjustments to the acceleration profiles to get something a bit more realistic wrt hauling distance. Here is the result.

Hi Walter

The translation speed, like others, is the absolute speed (along the path). In this case the path is nearly horizontal: The important point is the timing of events:
translation peak speed at 0.792 s
rotation peak speed at 0.834 s
haul peak speed at 0.871 s
line hand peak speed at 0.896 s

Merlin