Originally Posted by corners
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 y-axis. 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 -->