Racquet Optimization: My Pursuit, Progress, and Findings Thus Far

TheLambsheadrep

Professional
So I had this week to do all my customization/optimization experiments and calculations; it was a good week.

I am basing most of my customization on travlerajm’s posts, which started in about 2006 (from what I can see). With that said, I have found what I perceive to be indescrepencies with optimizing balance with mass, but I am assuming this is because the posts have spanned 6 years. Travlerajm: I am not arguing or criticizing, I just want to know what is right so I can do all of this the correct way. If I am misquoting/writing anything incorrectly, please let me know. I am also trying to put things in the past tense, since I don’t know what information you’ve posted is most recent/most accurate.

First, travlerajm stated that pros with the best average ranking had an MR^2 of 380-390. He also stated that the average pro balance point could be determined from R=44.6/sqrt(x). He also provided the equation -.581x+19.9 which, again, found optimal balance with different mass values. These three ways to optimize mass and balance give different results, though. For example, (.36kg)(32.7024cm)^2=385, but 44.6/sqrt(x) at 12.7oz=12.515in (12.765in for the “ideal” set up), and for -.581x+19.9, balance is 12.521in for 12.7oz.

So for 12.7oz, MR^2 says 5pts head light, 44.6/sqrt(x) says 7.88pts headlight or 5.88pts headlight “ideally,” and -.581x+19.9 says 7.83pts head light. the determined pro-averaged optimized balance for 44.6/sqrt(x) and -.581x+19.9 are close, but the ideal balance from 44.6/sqrt(x) is not. Also, MR^2 is pretty far from the pro averages. How should I look at all this data, because I cannot optimize MgR/I until I optimize mass and balance.

I was also able to find the SW of 6 of my racquets with the TW method. My 3 Head Radical Twin Tube Tour OS’s had swing weights of 357, 352, and 352. My 3 Head Ti. Carbon’s had swing weights of 333, 339, and 347. All of my racquets are currently set to 12.7oz and right around 8.5pts head light, so I was wondering why the big SW difference between the two models. I’m thinking it may be since I had to add much more lead tape to get the Ti. Carbons to those specs, or an Austria/China construction, or the difference in head size.

And I am interested in bringing a racquet or two up to 370 SW after reading through the SW2 information; it would be cool to feel what a pro wields, even though I am pretty good with my current set up. I would prob try my Radical Tour with the 357 SW since it’s closest, just a quick question though. The racquet was originally at 12.6oz and between 8-9pts head light, so I only had to add 3 grams at 2 inches up the handle. If I moved that and 3 more grams to 25 inches (under the bumper guard), it would make it 12.8oz, 6.2pts head light, and a SW of 375.7 (from TW manual customization calculator). So it would be the original factory racquet with 6 grams under the bumper – I wouldn’t need to counterbalance in the handle at all, right? After adding so much lead to the handles of my other racquets, it’s weird to me to only add tape at the top of the racquet.
 

Fuji

Legend
You should definitely try out SW2 bud, it's crazy to hit with if you have the arm to deal with it!

-Fuji
 

TheLambsheadrep

Professional
crazy as in spin...? im just concerned about it being over-powered, but i think i get the thing about how the high weight shortens the length of the shot since the racquet is harder to swing around.
 

Fuji

Legend
Crazy as in free power and easy spin!

It depends on your strokes but if you have some lead laying around it's something very fun to try!

-Fuji
 

travlerajm

Talk Tennis Guru
1. Since I started customizing in 2006, I've learned a lot. So if you see a discrepancy, just trust with my more recent post. :)

2. The finding that pros with MR^2 > 380 have the best rankings is a statistical observation. My belief is that pro's with MR^2 > 380 happen to be ones who have MgR/I optimized plus SW > 360. In other words, if you optimize the latter two specs, the MR^2 value will naturally tend to fall into place in the statistically optimal range.

3. MgR/I is a parameter that pertains to swing dynamics. The SW2 concept (high enough swingweight that permits spin-friendly impacts with the benefit of increased stability) pertains to impact dynamics. Swing dynamics (how the racquet moves when you swing) and impact dynamics (how the ball behaves after impact with your stringbed) can be dealt with separately, simplifying the optimization process.
 

travlerajm

Talk Tennis Guru
So I had this week to do all my customization/optimization experiments and calculations; it was a good week.

I am basing most of my customization on travlerajm’s posts, which started in about 2006 (from what I can see). With that said, I have found what I perceive to be indescrepencies with optimizing balance with mass, but I am assuming this is because the posts have spanned 6 years. Travlerajm: I am not arguing or criticizing, I just want to know what is right so I can do all of this the correct way. If I am misquoting/writing anything incorrectly, please let me know. I am also trying to put things in the past tense, since I don’t know what information you’ve posted is most recent/most accurate.

First, travlerajm stated that pros with the best average ranking had an MR^2 of 380-390. He also stated that the average pro balance point could be determined from R=44.6/sqrt(x). He also provided the equation -.581x+19.9 which, again, found optimal balance with different mass values. These three ways to optimize mass and balance give different results, though. For example, (.36kg)(32.7024cm)^2=385, but 44.6/sqrt(x) at 12.7oz=12.515in (12.765in for the “ideal” set up), and for -.581x+19.9, balance is 12.521in for 12.7oz.

So for 12.7oz, MR^2 says 5pts head light, 44.6/sqrt(x) says 7.88pts headlight or 5.88pts headlight “ideally,” and -.581x+19.9 says 7.83pts head light. the determined pro-averaged optimized balance for 44.6/sqrt(x) and -.581x+19.9 are close, but the ideal balance from 44.6/sqrt(x) is not. Also, MR^2 is pretty far from the pro averages. How should I look at all this data, because I cannot optimize MgR/I until I optimize mass and balance.

I was also able to find the SW of 6 of my racquets with the TW method. My 3 Head Radical Twin Tube Tour OS’s had swing weights of 357, 352, and 352. My 3 Head Ti. Carbon’s had swing weights of 333, 339, and 347. All of my racquets are currently set to 12.7oz and right around 8.5pts head light, so I was wondering why the big SW difference between the two models. I’m thinking it may be since I had to add much more lead tape to get the Ti. Carbons to those specs, or an Austria/China construction, or the difference in head size.

And I am interested in bringing a racquet or two up to 370 SW after reading through the SW2 information; it would be cool to feel what a pro wields, even though I am pretty good with my current set up. I would prob try my Radical Tour with the 357 SW since it’s closest, just a quick question though. The racquet was originally at 12.6oz and between 8-9pts head light, so I only had to add 3 grams at 2 inches up the handle. If I moved that and 3 more grams to 25 inches (under the bumper guard), it would make it 12.8oz, 6.2pts head light, and a SW of 375.7 (from TW manual customization calculator). So it would be the original factory racquet with 6 grams under the bumper – I wouldn’t need to counterbalance in the handle at all, right? After adding so much lead to the handles of my other racquets, it’s weird to me to only add tape at the top of the racquet.
Your frame with 357 SW has too much mass in the lower handle to make it easy to optimize MgR/I without going over 14 oz.

I'd recommend using the one with 333 SW. Start by adding about 1/2 oz. (14g) at around 23" from the butt (10 and 2). Then remeasure SW. This should put you at around 365. Then try adding about 0.2 oz. (6g) at 7" from butt. This should put MgR/I at close to 21.0. Then go to the wall and tune your forehand using the methods posted in my most recent "Optimum Balance" threads of the past year. Once your forehand feels tuned, you can then start tacking on lead to the end of the butt until your 2hb feels tuned also (adding lead to the end of the butt will have minimal effect on MgR/I for your forehand, but it will slow down you 2hb swingspeed. My 2hb feels optimized when Mg(R - 10cm)/SW = 22.55.
 

TheLambsheadrep

Professional
after this crazy week of papers and exams, im going to try to work out the numbers. i already have a lot of crap to deal with right after break !@#$%
 

TheLambsheadrep

Professional
So I calculated MgR/I for the 6 racquets as they are now (using 360g, 31.591cm, and their respective SW), and the results aren't all that bad for me just wanting to make them more head light and not calculating this stuff out first

Ti. Carbons: 21.262, 20.709, 21.022
Radical Tours: 20.332, 2 racquets with 20.519

Travlerajm says "The MgR/I value gives a measure of the natural speed of the pendulum sweep of the racquet.
Thus, it is expected that players who wear wristbands will have a lower optimum MgR/I value"

Does that imply that someone has a slower swing speed with a wristband than without one...?
 

Muppet

Legend
Travelerajm

Thanks for the tip last year on making my racquet feel less stiff by adding lead tape below the balance point. It worked like a charm on my Aerogel 200. Bigtime kudos!
 

travlerajm

Talk Tennis Guru
So I calculated MgR/I for the 6 racquets as they are now (using 360g, 31.591cm, and their respective SW), and the results aren't all that bad for me just wanting to make them more head light and not calculating this stuff out first

Ti. Carbons: 21.262, 20.709, 21.022
Radical Tours: 20.332, 2 racquets with 20.519

Travlerajm says "The MgR/I value gives a measure of the natural speed of the pendulum sweep of the racquet.
Thus, it is expected that players who wear wristbands will have a lower optimum MgR/I value"

Does that imply that someone has a slower swing speed with a wristband than without one...?

Think of your arm-racquet system as a double pendulum, with the top pendulum your arm, and the bottom pendulum your racquet. If you add weight to the the bottom of the top pendulum, it slows it down just enough that it has different timing relative to the racquet pendulum.

The key to optimizing MgR/I is matching the natural swing speed of the racquet pendulum to the natural swing speed of your arm. Wearing a wrist band won't make you swing noticeably slower or hit the ball slower, but it will noticeably affect the MgR/I value needed for optimum timing.
 

TheLambsheadrep

Professional
Hey travlerajm, I recently tried to get every spec optimized again, but it's very tough to get mr^2 and mgr/I in their ranges with the weight I want. Just looking at your signature and since mgr/I is more complex, is it safe to say that that's "better" to have optimized than mr^2 ?

I would love to get at least one to a 370SW with everything else optimized, especially since that would mean spreading out my lead tape and really polarizing the racquet. I would like to feel the difference of that from what I have now, where all the added lead is essentially in the handle.
 
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