Quote:
Originally Posted by corners
Sten,
Why not just use the parallel axis theorem to find the effective swingweights at the wrist, elbow, shoulder, etc.?

A good question. And the answer is that it is exactly what I am doing
The numerator in the equation in post 1 is Moment of Inertia around p
But choose to transform it into a weight for a couple of reasons:
 I think that weight is easier to understand
 The equivalent weight nicely converges to the weight of the racquet for very long swings, i.e. at the yaxis. Whereas the swingweight has no meaning when the racquet doesn't rotate.
 Weight gives the relation between force and acceleration whereas swingweight gives the relation between Moment and angular acceleration, again less intuitive.
You can download the "proof" of the equation
here >
/Sten