[Mathew]

I get the "what your saying" part of it, but am still missing the "why it's important" part, unlelss the important part is to turn this into a mathematical relationship for a correct dynamic model. Otherwise, it seems like a pretty complicated way to measure wrist cock. In an ordinary golfer, why wouldn't you just measure the angle of the wrist cock by comparing the shaft angle to the left forearm?

G2M

These things are important - not just for a correct model but to overall increase the understanding of alignments. Only with this highly detailed level of knowledge will you truely understand the golf stroke.

For example now you can say with full knowledge why it is wrong to take a 2d picture from a front on view and then draw lines directly across the left arm to the left hand to the sweetspot and measure the angle.

---------------------
But since we're on the subject of the mathematics, to do this you need yet another plane.

You need to reference the angle of the left arm relative to the inclined plane. If we reference this plane from the inclined plane itself and not the ground like we do for hinge action, it will be directly vertical to the inclined plane through the angle of the left arm. We can then work out the angle that the left arm is above the inclined plane. This can be the same as the angled hinge action (although unrelated) if you are talking about the angled plane that goes through the inclined plane vertically and not one of its other infinite possibilities. This plane will be the same as Jens plane when accumulator 3 has turned directly towards the inclined plane.

So basically

Key

x = no of degrees of accumulator no.3 has turned or rolled relative from the plane just described

y = no of degrees of accumulator no.2 relative to Jens plane and accumulator no.3 plane

z = the left arm angle above (+ degrees) or below (- degrees) relative to the inclined plane and using the plane just described as reference.

so x=y-((x divided by 90) times z)

Edit I forgot to put in the division part....