[Mike O]

I can see how all of this works on a 1-L machine where the primary lever is directly attached to a stationary post. In that model, the #3 accumulator is zeroed out. If you were to model a stationary post with a second hinge representing left arm and clubshaft like Yoda's real life model, then you would see that the left arm (Primary Lever) is always below plane unless #3 is zeroed out.

The definition of the #3 accumulator is the angle formed between the clubshaft and left forearm 6-B-3-0. That left forearm is pointing below plane most of the time.

In addtion, the human golfer as opposed to the stationary post model, has a clavical attaching the left arm to the sternum. As the post moves, the whole left arm assembly moves. We don't have our left arm jutting out from the top of our sternum. So when I talk about the left arm being off plane, it's really off plane as compared to the model.

So in discussing the terminology of your geometric model, it would be helpful to distinguish the model pieces as primary lever and secondary lever. The artwork you have presented is wonderful, but has certain limitations in that the #3 accumulator must be zero in order for sweetspot to be moved and rolled on plane.

As best I can tell, the #3 plane that you have identified is simply the inline relationship of the clubshaft and left arm and is best seen from a face on view.

Nice graphic work.

Bagger

Bagger,
Nice post!

Matthew,
Is your model representing a simple machine or an actual golfer? That's what's confusing to me- I thought you were representing a "normal Human golfing machine" not just a simple machine. Please clarify.
Thanks,
Mike