[O.B.Left]

Before we hit a few shots with our model we need to see a few more things in regard to the relationship between plane angle (and lie angle) and Hinge Action.

Namely

CHAPTER 2 STATEMENT OF PRINCIPLE continued

PAGE 23



.......Angled Hinge Action on flatter Planes (10-6, 10-7) approaches Horizontal Hinge characteristics and as the Plane steepens it moves toward Vertical Hingecharacteristics.

Here's a truly awful drawing trying to show this. Using the model which can only portray Angle Hinging . The circle not drawn but it could be. With a centre shafted clubhead .... which keeps the shaft and sweetspot on the same plane for simplicity . The arc drawn is from the players view of the clubhead orbit , the Arc of Approach ... not to scale . The face stays square to the arc , angled hinging. Also defined as... the face stays perpendicular to the inclined plane.




What does this mean to the human on the tee? As he or she moves to more upright lie angles (shorter clubs) the hinge action takes on the characteristics of Vertical Hinging . The clubface starts to layback more and close less . There's less clubhead travel associated with Vertical Hinging too assuming some #3 angle ( this is the human again not the model). There is more loft associated with more upright clubs. Less out to 3 dimensional impact. etc etc The ball responds accordingly. The axis the ball spins around (and it can only spin around one axis) tends to tilt less. Less "curve spin" if you will, more "back spin" . Less compression. Less ball speed speed .