Swingweight, Balance and weight

[Smooth__Genius]

Hello Everybody

I was wondering if anyone could explain what exactly the Swingweight is, how it's calculated, what is says about the racket and how it feels or what things it benefits in my game.
Also I wanted to know how the Swingweight is going to change when the Balance is changed e.g by adding weight to the top of the racket and how this is going to change the way the racket plays.
Lastly I'd like to understand what impact the pure weight has on the swingweight.

Thanks a lot for your answers

 

[fritzhimself]

Tennis Warehouse University

 

[Irvin]

I was wondering if anyone could explain what exactly the Swingweight is, how it's calculated, what is says about the racket and how it feels or what things it benefits in my game.

SW is another term for rotational inertia around an axis 10 cm from the butt of the racket. Rotational inertia is a racket’s resistance to a change in velocity around the 10 cm axis. To calculate the SW of a racket you must apply a known force to oscillate the racket and measure how the racket accelerates opposing that known force. SW is a measure of a racket’s resistance to change in velocity, or how it plows through the power. SW is often used as A measure of a racket’s power.

Also I wanted to know how the Swingweight is going to change when the Balance is changed e.g by adding weight to the top of the racket and how this is going to change the way the racket plays.

SW does not change the balance of a racket, or vice versa. As you add or remove weight from a racket the balance point moves in the direction of the added weight, while the SW always goes up. The distance the weight is added from the axis determines the degree of change. The greater the weight or distance the greater the degree of change.

Lastly I'd like to understand what impact the pure weight has on the swingweight.

I = mr^2 This is the formula for inertia. In tennis, because the inertia values are small, mass (m) is measured kilo grams, and distance or radius (r) is measured in centimeters. Mass is only a part of the formula.