It may be a term Nesbit invented I don't know but that doesn't matter.
Think of a wagon wheel. YOu have a rim and you have spokes extending to the hub (which has a certain radius). Now look at figure 2 of : http://www.motionanalysis.com/pdf/2005_nesbit.pdf . Those are diagrams of golfer swings (Think of each club freezeframe as a spoke with the head on the "rim" and the grip end on the "hub".
So the Hub is the "path" your hands take from the top down to and beyond the ball. The "instantaneous" radius of that path is what matters. You want it to decrease (This is what prevents casting and maximizes club head speed). If you fit a curve to that hand path of a better golfer it would look like a contracting spiral.
We have determined that there are relationships that exist between the changing radius and club head velocity, applied force, torque, work, and power, and that even a small change in hub path and wrist trajectory values can increase club head velocity.
We already know the #2 accumulator gives velocity power so it would seem that the radius is shorter until the point where the wrists begin to uncock and after that point the radius lengthens. That's why people who cast from the top lose power and tend to hit fat shots, they just made the club longer.
My 2 cents worth.
__________________ Hitting the Ball is the easiest part of the game-hitting it effectively is the most difficult. Why trust instinct when there is a science."1-G.
B. J. Hathaway, G.S.E.B., M.C.I.
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