Thanks, yeah, I really butchered that one. I should have refreshed my memory instead of relying on "the top of my head". Just as Force = Mass times Acceleration, Torque = Moment of Inertia times Rotational Acceleration. So Rotational Acceleration = Torque divided by Moment of Inertia. If the golfer's MOI increases and the torque applied remains the same, the object's rotational velocity will decelerate. So, to maintain rotational velocity in the downswing, the golfer needs to apply increasing torque in direct proportion to the increase in MOI. For nearly all of the second half of the downswing, Sadlowski appears to be doing that very well.

As I thought some more about the Sadlowski numbers, I realized I miscounted the number of frames the first time around (last week), so in post #11 above I did not calculate the average rotational velocities in the first and second half of the downswing accurately. I also hadn't noticed then the distortion created by the shortened y-axis.

Knowing now that from the top to hips square is 17 frames and that his hips were likely at least 50 degrees closed at the top, Sadlowski's hips rotated at an average rate of about 529 degrees per second in that first half of the downswing. From square hips to impact, Jamie's hips rotate about 60 degrees open in 18 frames. That is equal to an average rate of rotation of 600 degrees per second, a

**13% increase in average rotational velocity after the hips square.** That doesn't exactly square (pun intended) with the following pronouncements:

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Sorry to hear about your wife and her hips. My mom also had both hips replaced so I know it isn't much fun.

Take care,

Jeff