Blade v7 16x19 twistweight

slal1984

Semi-Pro
Hi All,

I was curious on how I can increase the twist weight to match or come close to that of the Blade v7 18x20. (with a minimal increase in SW)

would it be as simple as adding some lead at 3&9? along the same lines of increasing stability?

Babolat Leather grip on both frames.
 

pyrokid

Hall of Fame
3 & 9 would do it, you could move it more towards 4 & 8 if you really wanted to minimize effect on swingweight
 

slal1984

Semi-Pro
i did try that and i even when i changed 'mass to add' from 2g to 15g for 3 and 9, the twist weight stayed the same 13.7
 

AA7

Professional
Hi All,

I was curious on how I can increase the twist weight to match or come close to that of the Blade v7 18x20. (with a minimal increase in SW)

would it be as simple as adding some lead at 3&9? along the same lines of increasing stability?

Babolat Leather grip on both frames.
u trying to get more stability I assume.. i think it's hard to do it w/out not getting SW at 3/9 but that is probably the optimal max twistweight and least SW spot...
 

slal1984

Semi-Pro
Just realized i have to provide the width location...my bad..That changed it quite a bit.

Just to be sure - For a blade 16x19 what would the length location and width location be for lead at 3 and 9 please?
 

Wheelz

Semi-Pro
Just realized i have to provide the width location...my bad..That changed it quite a bit.

Just to be sure - For a blade 16x19 what would the length location and width location be for lead at 3 and 9 please?
You would have to measure it but 52 and 12 cm should be close.
 

Irvin

Talk Tennis Guru
If you keep the racket length the same there is no way to increase TW effectively without increasing SW more. But you could shorten the racket from 27 to say 26.75”. That drops SW a good deal while not making and change at all to SW. then when you add mass at 3&9 you increase TW and you could bring the SW back to the original value.

But you don’t want to mess up the original racket so it can’t be restored. So you could get a second butt cap and cut the inside of the cap out so you could slide the cap up on the hairpin 1/4” or more. If you don’t like the shorter racket put standard butt cap back on.
 

slal1984

Semi-Pro
So i prepped all my 16x19's for a hit today!!!
Leather grip with overgrip - strung at 54/52 - tourna silver 7 tour 1.25
- 4g from cross 6-13
- 3g from cross 7-12
- 2g from cross 7-10
- Stock

Will start with the 3g frame and use that as my benchmark. Thanks for all your help.
 

El_Yotamo

Professional
In my experience customization is a lot easier and more organized if you have your own spreadsheet and calculator and know the formula for calculation rather than using TWU's website which while user friendly is difficult to work with in an organized and efficient manner. So I'll tell you the formulas TWU uses and leave it at your discretion whether to use them independently or not:

Balance:
The balance is the center of mass, so it's the average of all mass on the frame. The formula you get is:
r_f=(m_0*r_0+Δm_1*r_1+Δm_2*r_2+...)/m_f
Where m_0, r_0 are the original mass and balance point, and each delta term represents an added mass with its corresponding location. m_f represents the final mass and r_f is the final balance point. Make sure to keep units consistent.

Swingweight:
The swingweight, as we can see, is in units of kg*cm^2. This ties in with the formula we'll use as you'll see in a sec:
SW_f=SW_0+Δm_1*(r_1-10)^2+Δm_2*(r_2-10)^2+ ...
Where like previously SW_0 is the initial SW and SW_f is the final one. The deltas are the same as the above. We subtract each position by 10 is because the SW axis is 10 cm up the handle which is usually where your hand will reach. The units here are crucial! Mass is to be entered in kilograms and distance is to be entered in centimeters, since the units are kg*cm^2. The reason it's so crucial here is because this is a nonlinear calculation (because you're squaring things, not just multiplying and adding) so it's a little tricky to convert units and you can get really scrambled and get unreasonable results. As an added note, you should usually neglect any mass you add in the handle in this calculation, unless you're asking more than about 10-20 g in there.

Twistweight:
The TW is similar to the SW except it's on a different axis in a different direction. Up until now, our "r" has stood for distance lengthwise from the butt of the racquet (I hope that was clear btw). When calculating TW however, our "r" will be the widthwise distance from the centerline of the racquet. Other than that it's basically the same as SW and here it is:
TW_f=TW_0+Δm_1*(r_1)^2+Δm_2*(r_2)^2+...
This time there's no need to subtract 10 because the axis is at the center line of the racquet, which is considered our "0 point". The indices and symbols are the same as above. I'll remind again, it is crucial to get the units right or you'll get a result which is very terribly off.

I hope I've been of help, I hope I haven't derailed, and most importantly I hope I've convinced enough people to take the calculations into their own hands. Good luck!
 
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slal1984

Semi-Pro
I tried lead all over the frame as mentioned above...lol. But I just could not find a rhythm, could not find the control I was looking for. After about 6-8 hrs of hitting over the weekend. I realized I was looking at this all wrong.

I was not missing stability rather was missing a consistent response from the string bed. I don't know how to explain it, but all I could boil it down to was the launch angle. I am switching from the Youtek Prestige Pro to the Wilson blade v7 16x19.

So, I was not sure if the switch from a denser to a more spaced 16x19 is the issue. Anyways...I took the lead off and bumped the tension by 2 pounds from 53/51 to 54/53 and 55/53 (Tourna silver 7) and then it was amazing, However after like 4-6hrs on those strings, I could feel I was losing that precision and control.

Do I just need to restring more often at a higher tension!!??
 

Irvin

Talk Tennis Guru
i did try that and i even when i changed 'mass to add' from 2g to 15g for 3 and 9, the twist weight stayed the same 13.7
How are you going about measuring your TW? Adding 15 g to 3&9 will raise TW over 2 points.
 

slal1984

Semi-Pro
How are you going about measuring your TW? Adding 15 g to 3&9 will raise TW over 2 points.
I gave that up. :(. I think that SW would be too much for me.

I used to be a 5.0 a year ago (NOVA area - not a very good one..lol), but after my 3rd knee surgery, i got bumped to 4.5. and to be honest, don't have that same core strength to use a SW more than 325-328 over 2hrs.

I think I may have just decided to switch to the wrong racquet..lol.
 

Irvin

Talk Tennis Guru
I gave that up. :(. I think that SW would be too much for me.

I used to be a 5.0 a year ago (NOVA area - not a very good one..lol), but after my 3rd knee surgery, i got bumped to 4.5. and to be honest, don't have that same core strength to use a SW more than 325-328 over 2hrs.

I think I may have just decided to switch to the wrong racquet..lol.
Then I would not add 15 g of lead to 3&9. That much lead adds over 2 points to TW but it adds over 26 points to SW.
 

Dragy

Hall of Fame
Then I would not add 15 g of lead to 3&9. That much lead adds over 2 points to TW but it adds over 26 points to SW.
He was tinkering with TWU customization tool I guess, not applying lead to actual frame. And tried to see change in TW spec without entering width value for added mass.
 
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