[Daryl]

I see where you are going, Daryl. The last figure descibes the rotation of the Left Arm Flying Wedge in a horizontal hinging procedure.

That is perfectly True. You understand that.

The LAFW rotates on a plane that is on right angles to the inclined plane.

No.. The LAFW rotates on one of three associated Planes. Horizontal, Vertical or Angled.

But it is the on-plane rotation* that is the big deal. The rotation that happens on the inclined plane. The plane the clubhead moves on. That's the plane we have to look at when we consider hand speed and clubhead speed, and RPM vs MPH.

* A rotation that is on plane has a rotation axis that goes straight through the plane.

No..That's a Swivel, not a Hinge.

Hinging:

It is said that Hinging controls the Clubface alignment. It controls the Clubface Alignment to an associated Plane. Hinging is not what squares the Clubface for Impact.

Horizontal Hinge: causes he Clubface (and Left Arm Wedge) to rotate on a Horizontal Plane
Angled Hinging: causes the Clubface (and Left Arm Wedge) to rotate on an Angled Plane