Here is the way I see it:
The "stock swing" on ENSO-pro was a flawed technique.
Speeding up the bottom of the handle "UNLOCKED" speed that was already there.
Remember, I was trying to catch a MAJOR WINNER with a similar hand speed (.7-.9 mph more).
Dear Brian,
CAUTION WE ARE ENTERING THE NO SPIN SCIENCE ZONE
But, we have the opportunity to be entering an area where science CAN be a great help, but IMO, the data gathered, are starting to be interpreted incorrectly, maybe even unscientifically, due to some assumptions/ questionable observations.
As an example, the velocity of the club head (in feet per second) is simply the Angular velocity of the club (in radians per second), times the radius of rotation (in feet). The confusion comes from the fact that the grip end of the club is also moving by the rotation of the left arm, the upper element of this double pendulum. So the combined effect of these two rotating elements is that the 'actual' 3D point of rotation that results in the 'actual arc' of the club head is constantly changing, so I describe this activity as the 'instantaneous center/point of rotation'(ICR) and for Brian's swings on ENSO result in the following radii using his 'actual' angular velocity and his ‘actual’ club head speeds he provided in the video.
(1) Normal swing, 2074 degrees per second, and 102.5 miles per hour CHS resulted in an 'instantaneous center of rotation of 51 inches.
(2) Spider man, 2182 degrees per second and 101.2 miles per hour CHS, resulted in an ICR of 46.5 inches,
(3) 'Square' 2044 degrees per second and 103.1 miles per hour CHS, resulted in an ICR of 50.5 inches, and finally,
(4) 'Open to closed', 2085 degrees per second and 101.3 miles per hour CHS resulted in an ICR of 48.7 inches.
What this strongly suggests to me is that AT IMPACT for all 4 swings, the ICR is about a foot ABOVE the ‘coupling point’, along the line of the shaft. So to increase club head speed at this Brian-created set of conditions, IMO, for increased CHV, would suggest the addition of a torque/couple around this ICR, NOT the coupling point, (which would SHORTEN the radius, and significantly reduce the club head velocity).
Finally, and my science CAUTION from above, IMO it is crucial to have the ‘handle rotation velocity’ versus time graphs NOT just at impact, but at least from the time of max kinematic sequence velocity of the left arm, but most desirably for the entire downswing.
From these angular velocity continuous curves we can accurately determine (by integration) the angular change in position, and the angular acceleration (by differentiation), using the slope of the angular velocity at any time, not just at impact.
I call all of this ‘Inside the kinematic sequence’, so in addition to all of you reading this, I hope the attendees and especially the scientists from Anti Summit II will weigh in here to enlighten all of us regarding their thoughts about Brian’s data and this critical area.
