[HungryBear]

When I see "Rotated" I think 10-13-C which is, turn around the spine or could be turn about a post.
I see little use but it is possible and would be 1-L. this would not be on a practical plane for full swings.

The original question on FLAT and Rotated BS planes ( where the rotated plane may be too steep) I would answer is because it intercepts a starting point for a practical DS plane.

Most think this to be the TSP. I think of TSP as being a point-any point- from which a practical DS plane can be constructed.

Not that I really want to get into this here but--
Trying to create a machine that represents all elements of the golf stroke is difficult. Most attempts have resorted to the "Double Pendulum" model. In my simple mind- NOT GOOD. I have been thinking along the lines of HAND PATH GEOMETRY and single pendulum. And if the hand path geometry can be expressed as a mathematically determined figure the computer (real computer) is "home free.
So, I started thinking as the Hand Path Model being Hyperboloid of single sheet and the club is simple pendulum
.

HB