[Jeff]

Daryl

We "seemingly" operate in parallel mental universes and we therefore see "reality" very differently.

I think that the TPI graph represents an expert golfer who uses a pivot-driven swing action with optimum kinetic sequencing. It is certainly not a hand throw action that starts from the top of the swing. The left arm is moving at the same speed and rate of acceleration as the shoulders (rate of acceleration = slope of the graph) in the early downswing, because the power package remains intact in the early downswing. The left arm only eventually moves faster than the shoulders/hips in the mid-late downswing when the hips/shoulders decelerate due to natural forces - and that represents the release of PA#4.

You state-: "Thrust is the "Rate of the Acceleration" not the "Acceleration" (which is the rate of Velocity).

I disagree. In my mental universe, "acceleration" is the rate of change of velocity (change in velocity per unit time) and the slope-angle of the TPI graphs reflects the degree of "accleration". The phrase "rate of acceleration" only has meaning to me if the slope of the graph changes significantly in slope-angle during the acceleration phase of the downswing. That shouldn't happen in a good golfer - as reflected by those TPI graphs.

You write-: "The hips pull the Shoulders through the Impact Interval and beyond at a steady speed to provide an increase in Mass."

Where is your "evidence" that the hips and shoulders are moving at a steady speed through impact? You state a steady speed is required to increase "mass". What "mass"?

You write-: "The Clubhead should reach its maximum speed three feet after impact, or at least that’s what you should be trying to do. That's the #4 Accumulator."

I disagree. I agree that the clubhead should be reaching its maximum speed at impact (or just after impact) but that is not conceptually equivalent to the release of PA#4. Clubhead speed is dependent on the speed of release of PA#4 and PA#2, and it is also dependent on the principle of COAM. Increasing speed of the clubhead requires energy that is derived from the left upper limb in a swinger's action, and according to the principle of COAM the left arm must slow down when the clubhead speeds up (in the absence of additional energy input in the late downswing). I am not aware of any force that is inputting further energy into the moving left arm/clubshaft unit during the late downswing.

Jeff.