# Swingweight calculation question

#### TennisManiac

##### Hall of Fame
I bought a V7 Blade 16x19. It came to me weighing exactly 305 unstrung and was 6.5 pts. hl. After I strung it with a full bed of Alu Power it weighed 321 and was 3.5 pts. hl. This racket is supposed to have a swingweight of 328 "strung". So lets just say that's the case here.

I added a 5 gm overgrip and 4 gms of lead under my grip. So thats 9 gms to the handle.

I then added 3 gms of lead at 12 o'clock.

The racket now weighs 334 and is 4 pts. hl.

What do you think the swingweight is now after adding 3 grams to the tip and 9 to the handle? I was thinking somewhere around 340. But I really have no way of figuring this out. Is there a formula to figure this out?

#### gutfeeling

##### Hall of Fame
I bought a V7 Blade 16x19. It came to me weighing exactly 305 unstrung and was 6.5 pts. hl. After I strung it with a full bed of Alu Power it weighed 321 and was 3.5 pts. hl. This racket is supposed to have a swingweight of 328 "strung". So lets just say that's the case here.

I added a 5 gm overgrip and 4 gms of lead under my grip. So thats 9 gms to the handle.

I then added 3 gms of lead at 12 o'clock.

The racket now weighs 334 and is 4 pts. hl.

What do you think the swingweight is now after adding 3 grams to the tip and 9 to the handle? I was thinking somewhere around 340. But I really have no way of figuring this out. Is there a formula to figure this out?
There’s no way for you to know the exact swing weight of your frame unless you measure it on a diagnostic machine. Assuming your frame was 328 before modifications, 3 grams at the tip will bump it up to 338. The 9 grams you added to handle will increase it by at most 1-2 points. Keep in mind I’ve measured blades with swingweight of 310 strung. You never know with Wilson quality control. There is a formula and TWU provides calculation worksheets. But basically every gram at the tip adds 3.3 sw points, weight at 3 or 9 adds just under 2 sw points, and weight at 6 adds roughly 1 sw point.

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#### BlueB

##### Legend
There’s no way for you to know the exact swing weight of your frame unless you measure it on a diagnostic machine.
Or home swing method using TW calculator...

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#### gutfeeling

##### Hall of Fame
Or home swing method using TW calculator...

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Good luck!

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#### TennisManiac

##### Hall of Fame
Good luck!

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I know... I won't even try that crazy home method. Its extremely inaccurate.

Thanks for the input you provided. It was somewhat useful to know what each gram equates in terms of swingweight.

#### BlueB

##### Legend
It's very consistent if you knew what you were doing and being precise at measurments.

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#### gutfeeling

##### Hall of Fame
I know... I won't even try that crazy home method. Its extremely inaccurate.

Thanks for the input you provided. It was somewhat useful to know what each gram equates in terms of swingweight.
If you don’t like weight at the tip, try 3 and 9. The 16x19 v7 blade in particular could benefit from higher twist weight.

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#### Kevo

##### Legend
What do you think the swingweight is now after adding 3 grams to the tip and 9 to the handle? I was thinking somewhere around 340. But I really have no way of figuring this out. Is there a formula to figure this out?
You can use the timed swing method as mentioned earlier. It's pretty good if you get it set up well and take several readings. Once you get the hang of it you should be pretty close to what a machine would measure.

I did this method quite a few years ago when I matched up my 3 PSLs. They were all within the margin of error IMO. I mainly did it out of curiosity more than anything else. Once everything was matched and strung the same I couldn't tell them apart any more.

My question is why is the number important to you? Just for future reference so you can compare? I haven't measured swing weight of a frame in many years. I know that for me the serve is the limiting factor in terms of swing ability of a frame. As long as I can turn it over on my flat serve fast enough then the swing weight is good. If I have trouble with that flat serve then it's a no go for competitive play.

#### Irvin

##### Talk Tennis Guru
3 g at the tip of the racket will add 10 points to SW. 9 g in the handle wonder do much at all

#### Power Player

##### Talk Tennis Guru
I bought a V7 Blade 16x19. It came to me weighing exactly 305 unstrung and was 6.5 pts. hl. After I strung it with a full bed of Alu Power it weighed 321 and was 3.5 pts. hl. This racket is supposed to have a swingweight of 328 "strung". So lets just say that's the case here.

I added a 5 gm overgrip and 4 gms of lead under my grip. So thats 9 gms to the handle.

I then added 3 gms of lead at 12 o'clock.

The racket now weighs 334 and is 4 pts. hl.

What do you think the swingweight is now after adding 3 grams to the tip and 9 to the handle? I was thinking somewhere around 340. But I really have no way of figuring this out. Is there a formula to figure this out?
I can tell you that that the 18x20 has a higher SW than TW listed. They swing at more like 340. Now that I am 100% used to it, I love it. I know this because I used their matching service and thought my first frame was 336 or so. It was very tough for TW to find a frame that was 336 strung up, but they did it. So I have one that swings at 340 (guessing by feel) and one at 336. Not a huge difference, but based on that. I am thinking that your 16x19 is swinging closer to 338 or so with the lead you added.