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Old 09-05-2012, 10:35 AM   #15
stoneage's Avatar
Join Date: Apr 2010
Location: Stockholm, Sweden
Posts: 243

Originally Posted by corners View Post

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 -->


Last edited by stoneage; 09-06-2012 at 12:22 AM.
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