Category Archives: Natural Gut String

2020 is Coming Into Focus!

2019 came and went in a blur!  In a few days it will 2020 and with it will come some exciting new tennis stuff, for sure!

I am not so good at predicting things but I do it anyway!  Here are a few predictions I will make for 2020:

  1. Tennis racquets will become more expensive, but only slightly.
  2. On-line sales of tennis racquets will increase.  See this previous post.
  3. Customer satisfaction with on-line sales will decrease.
  4. Small specialty tennis shops will be the source of information, then #2, and then #3.
  5. Players will stick with a racquet longer, making customizations as needed.
  6. String and stringing will become a more important component of a racquet purchase.  See below!
  7. Tennis related injuries will continue to be a problem for the sport going forward.

    No Underage Polyester, Please!

    Thank you for thinking about the “long term” for all tennis players!

    There are no bad strings just bad applications!

    The right equipment is crucial to the long term enjoyment, and winning, of tennis!

    The local representatives I deal with are committed to our “well being” even though some may feel like they are facing “extinction”!

    An excellent example of what we are talking about just walked in! Two (2) new racquets so poorly strung it is shocking!

    The customer is having serious arm issues with an excellent racquet, with a terrible string setup! But the string setup is probably considered by many to be the ultimate combination, that is RPM Blast in the main and VS Touch in the cross! That combination is coming out in a few minutes!  No more polyester!

    The quality of the stringing is what is so wrong! Had you or I received this racquet, we would have returned it at once! Why? Because it exemplifies the attitude of so many stringers that is “who cares”!

Happy New Year!

String. What is important?

The essential function of string in your tennis racquet is to return energy to the ball as it collides with the racquet. It is evident that if there is no string or a broken one, the racquet can not do what it is intended to do, and your shot is going nowhere or worse, everywhere!

There are about thirty (30) string brands, and each brand has about ten (10) different models, and maybe three (3) different colors, so there are nine hundred (900) possible selections! Nine hundred is way too many strings!

You and we need to consolidate string data so we can make the right decision for you, your playing style, and your physical capabilities.

We test every string for elongation, creep, (stability), with a little bit of elasticity data observed. This testing returns our exclusive Power Potential© for each string, and that is the basis of our decision-making process. Naturally, the higher the elongation, the more power the string will return to the ball, and conversely, the lower the power potential, the less power that “can” be generated. You can observe this fundamental by dropping a tennis ball on a concrete floor and then on a strung tennis racquet from the same drop height and see which one bounces the highest.

I use “can” because power, to a great extent, comes from how hard you swing the racquet, which, of course, brings the prospect of overdoing it and subsequent injury! A low power string demands a more powerful swing that involves the entire arm, hips, and legs.

Low power, in the form of a stiff string, has been associated with control, therefore, the increased use of stiff strings. However, with stiffness comes another downside, and that is stability. Stiff strings typically lose tension quickly and need to be changed frequently. So here is the real problem; the string may not be broken, but it is not playing well at all. There is a difference between durability and performance! If your goal is long term performance, a stiff string is not the answer.

What, then, is the answer?

Choose a string with an elongation of 10% or higher! Oh, great! You say. How am I going to know that!

Well, beginning January 1, 2020, I will be posting the power potential of every string we have tested over the years! There are over 500 items on the current list sorted by brand. The color coding is RED if 5% or less, GREEN if 10% or higher, and BLUE for everything else. Note, however, that natural gut is included in this data and will probably not reach the 10% Power Potential© threshold, but is still the best performance string available.  This is due to the dynamic properties of the natural fibers, so, until there is a separate classification gut will be included as is.

A previous post, “What is Soft?” goes into graphical detail.

As new strings are added, some older ones may be deleted because they are no longer manufactured. However, some very old ones may remain due to their “legacy” status. This chart is a preliminary format but will get us map toward the right decision!

Click here to see all the current power potential data.

 

 

 

 

 

 

 

 

 

Dr. Goodman visits the World Headquarters!

We were thrilled to have Dr. Brad Goodman visit the World Headquarters to produce a session for his Doc-Talk-Live program!

Dr. Goodman is a tennis player who wants to know more about equipment in an effort to protect his body and beat his opponents.  You can catch this episode here: Doc Talk Live

In addition to the session Dr, Goodman was given the opportunity to “stretch” both a very stiff string and a very “stretchy” string, something that he, and many others, have not done.  Needless to say he was amazed at the difference.

Dr, Goodman’s visit was a great opportunity to have a real conversation about tennis equipment.  Please let me have your comments!

 

Wilson Clash 100

Once in a while words “fit”! Clash fits this new Wilson racquet because it disrupts the trend of “everything stiff”. Luckily this trend is dying and Wilson has, in my view, done a masterful job of expediting that demise with this concept.

Wilson Clash 100

Not only does this racquet look good it just feels good in the hand. It is light, maybe too light, but the brain detects something different about this racquet. We all know racquets are all about “the brain”!

In this review you may notice the addition of a couple of specifications. One is “Racquet – In Plane Stiffness”. This is the racquets resistance to”squeezing the sides together. The higher the number the more resistant (stiffer) the racquet is. Another addition to the review is the three (3) weights taken at the sides of the head and at the very bottom (butt cap) of the racquet. This very helpful when matching or customizing a racquet. so I thought we would include it.

Before this racquet is strung it has a noticeable “softness” which is expected given the 52 stiffness (Wilson is not using the defacto device, RDC, for their stiffness rating). However, after stringing, the racquet takes on a different “feel”. It is like the string is pulling all the material components together! I intend to hit with this racquet tomorrow so as right now I have no idea how it will feel.

To get the maximum from this racquet our demo is strung with Luxilon Natural Gut, 125 and the new Wilson Sensation Plus multi-filament with a “wear” wrap. This should be a great setup, so if you want to hit with the latest technology this is it!

For each racquet we do an “Accuracy Index”. This tells us how accurately the ball will come off the string bed when hit at different locations on the string bed. This racquet has an index of 97, which is very good, in the areas of the string bed that show the most failure (breakage). The overall string bed index of 94 is quite good and tells us that the string bed should produce as much accuracy as the players skill allows!

Take look at the following specifications to see if you agree with the player evaluations you may have read.

ManufacturerWilson
Racquet ModelClash 100
Reference Tension58 lbs - 26.3 kg
String
Luxilon 125 Gut =M
Wilson Sensation Plus =X
Machine UsedTrue Tension Professional
Static
ASPS, RDC56
ASPS, FlexFour61.5
Racquet Flex, RDC51 - After stringing
Racquet Flex, FlexFour27
Racquet - In Plane Stiffness317 lbs/Inch
Weight, Grams309
Weight, Ounces10.90
Balance, mm322
Balance, Inch12.68
Length, Cm68.5
Length, Inch27.0
Head Width9.92
Head Length12.85
Head Area, cm2646.0
Head Area, Sq. Inch100.1
Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains.650
Main String Grid7.50
Cross String Grid10.37
Density (% of head filled with string).779
Average Cross String Space.547
Average Main String Space.469
Dynamic
Dynamic Tension, Kp, ERT37
Dynamic Tension, Lbs/in206.94
First Moment, Nm.764
Polar Moment321
Torsional Stability15
Swing Weight, Kg/cm2306
Swing Weight, Ounces10.79
Swing Weight Calculated320.4
Power, RDC34
Control, RDC70
Manueverability, RDC83
Power, Calculated 1562.7
Head Points6.46
Head Weight, %47.0%
Center of Percussion21.5
Dwell Time, ms8.50
Efective Stiffness - lbs26.7
K, Lb/In179.49
Recoil Weight155.9
Twist Weight227.1
End Weight 126.8
Tip Weight 181.9
9 O'Clock94.0
3 O'Clock93.9
Butt Cap119.9

What is Elongation?

In dictionary terms it is:

“the amount of extension of an object under stress.”

In tennis terms, it means the same thing when talking about tennis racquet strings.

How much does a string stretch under the reference tension load or otherwise stretched (impact)?  The proliferation of wrist, arm and shoulder injury has brought attention to the property of “stiffness.”  The problem is that your stiffness may be different than my stiffness, so there needs to be an “index” associated with each string, in my opinion.  I have that data on over 500 tennis strings, but that is just me.

The images show the results of high elongation (left) and low elongation (right) string upon breaking.

Several years ago a player asked me “where is the string that is missing?”  Well, it is not missing.  The ends you see should be connected!

If the string has little elongation when it breaks there is nothing “pulling” it apart like the high elongation string. So each time you hit the ball, the string either elongates a bunch or it doesn’t.

In the case of the high elongation string, on the left, it absorbs a good portion of the “shock” associated with a hard hit, whereas the low elongation string, on the right, lets your body do the absorbing to a great extent.

So, it is reasonable to use very low reference tensions for low elongation string (35 to 45 pounds; 16 to 20.5 Kg) and higher tensions (45 to 60 pounds; 20.5 to 27.2 Kg) for high elongation strings.

You may ask, “how do I know how stiff a string is?”  If you see the word “polyester or co-polyester” it is likely that string wil be stiff compared to natural gut, most nylon based multi-filament construction, and PEEK (Zyex) material.  In my opinion, there is no “bad” string just “bad” applications.  If in doubt…ask!