2-F. Plane Of Motion:

“Regardless of where the Clubshaft and Clubhead are joined together, it always feels if they are joined at the Sweet Spot - the longitudinal center of gravity, the line of the pull of Centrifugal Force.”

“So there is a “Clubshaft” Plane and a “Sweet Spot”, or “Swing” Plane."

“Both Planes always pass through the Lag Pressure Point.”

Kelley defines hence two point which are used to define his swing plane, ie., Sweet Spot and Lag Pressure Point.

Usually the term Sweet Spot is used to refer to a point/area on the surface of the clubhead.. But it is also used by some to refer to the center of gravity of the clubhead. Homer’s use of Sweet Spot does not fit with either of these definitions.

I am guessing that Homer probably refers to a situation as depicted in Fig1. One dangles a club vertically and takes the intersection of the vertical with the horizontal midline of the clubhead. However this intersection point is neither the longitudinal center of gravity nor the center of gravity of the clubhead.

It would be true if the mass of the shaft is negligible, but it is not, and the mass of the shaft moves the longitudinal center of gravity away from the clubhead, as depicted in Fig 2.

The line of pull of Centrifugal Force, and hence the Swing Plane, is hence not going through Homer’s Sweet Spot but through the cog of the club shaft/head ensemble.

Equally, the line of pull of Centrifugal Force, and hence Homer’s Swing Plane, is not going through the Lag Pressure Point but rather through the center of the lead arm wrist joint. See Fig 2 .

For comparison I have depicted in Fig 3 the down the target view of Homer’s idea of a dynamic Swing Plane and Mandrin’s Swing Plane. They are distinctly different.


Conclusions:

Homer distinguishes correctly between a (static) shaft plane and a dynamic swing plane but is not correct in the use of terms and definitions.

mandrin