# USRSA power ratings

#### Nellie

##### Hall of Fame
I am not a member of the USRSA, but I just find this link through Tennis.com, and was curious on how the power ratings are calculated. I get surprising power numbers for different frames. A times, a small heavier, flexible racquet can have a higher "power" number then a lighter, large head biginners frame. What really seems to make a difference is racquet length, with longer racquets having much higher power numbers.

http://www.racquettech.com/tennismag/tennismag.html

I guess it makes sense (since force=Mass* acceleration). Does anyone understand how they calculate this rating?

Also, it got me thinking that purhaps supposed "players" frames may not be control oriented because of the power level (which is often quite high), but because of the flexibility and the ability to keep the ball on the strings. Thoughts?

#### meowmix

##### Hall of Fame
I am not a member of the USRSA, but I just find this link through Tennis.com, and was curious on how the power ratings are calculated. I get surprising power numbers for different frames. A times, a small heavier, flexible racquet can have a higher "power" number then a lighter, large head biginners frame. What really seems to make a difference is racquet length, with longer racquets having much higher power numbers.

http://www.racquettech.com/tennismag/tennismag.html

I guess it makes sense (since force=Mass* acceleration). Does anyone understand how they calculate this rating?

Also, it got me thinking that purhaps supposed "players" frames may not be control oriented because of the power level (which is often quite high), but because of the flexibility and the ability to keep the ball on the strings. Thoughts?

I think it's that exact formula. The problem comes with acceleration. Acceleration will be based off of stiffness, swingweight, amount of energy imputted, etc. Amount of energy will be key. It will take more energy to swing a heavier racket, but depending on what energy level we're talking about, some racket may be at a disadvantage. A moderate every level will be sufficient for a beginner racket to generate sufficient swing speed, but will create very little for a 12 ouncer. On the other hand, a relatively high imput of energy will create the same swingspeed as a really high imput of energy for a beginner's racket (hypothetically speaking, there'll be a limit).

#### Greg Raven

##### Semi-Pro
Feel free to propose your own formula. Keep in mind that, typically, the heavier the racquet the more powerful it is.