Category Archives: Juniors

Turn the Head Radical Pro Into a Beast!

I am very happy to see players of every age returning to, or buying for the first time, racquets that have some weight!  Weight is your friend!  Any racquet can be “customized” to suit the needs of the player, of course.

But what do you do if you already own a Head Radical Pro?  You simply add the Head Players Cap System to your current Radical Pro.  This can be done the next time the racquet needs stringing and can be removed at the next stringing if wanted.

This is a “side by side” look at the Cap System Radical and the standard Radical.  You will need to like the color “orange”.

The Cap System can be added to many past Radical Pro racquets. The Cap System does not fit the Radical MP, unfortunately.

The image below shows the racquets and the specifications of each one.  You can see the difference between the two.  It is obvious that the major difference will be weight and swing weight.  The numbers between the two racquets are the data for the Radical Pro with the Cap System.

Turn the Head Radical into a Beast!

Jack Anthrop Scores Big in Nassau!

Congratulations to Jack for his Finalist finish in the Junkanoo Bowl in Nassau!

Jack has been playing ITF events and was a qualifier for this tournament.  Not only did he qualify, Jack went on the finals where he put in a great three (3) set effort against Harrison Gold, 6-7,6-2,5-7!

Jack Anthrop & Harrison Gold
Junkanoo Bowl

Well done, Jack!  Congratulations

Big Bag Blowout…Again!

This seems to be a semi-annual event but that’s OK!

This event is a little different though!

Every bag regardless of size is only $60.00!  This is extraordinary but we need the room.

Most bags are Head or Wilson, some are 6 racquet bags some are 12 racquet bags.  It makes no difference!

Walk in with three (3) 20’s and walk out with a bag worth twice that much!

Hurry because this event is for in-stock bags only and the supply while taking up a lot of room, is limited!

This picture is not representative of all the bags.  Call for a quick update on available bags!

This is Important!

I was just going through some older posts and came across this “E” Book post and believe it is more relevant now that when I originally posted it!

Take a look because this is important!

What is Soft…er?

What is “Best Overall Performance”?

In our “Recommended Stringing Frequency” calculator we state that this frequency is to get the best possible performance from your racquet.   But, what exactly is “best performance”?

To establish this we need to take you, the player, out of the picture for a moment and concentrate on the racquet and string setup.  the reason is simple:  no two players strike the ball the same way.

We start with “Swing Weight” which is the most important dynamic property of a racquet.  So a higher swing weight will contribute to power and stability, thus performance.

Overall weight is important because you need to be able to get the racquet to the court and out of your bag!  Heavier racquets contribute to energy, stability, and comfort.

Effective Stiffness is important because it represents the stiffness of the string bed (SBS) and the racquet stiffness (xxRA, or something like that).  This number represents the impact each time you strike the ball.  The higher the number, the stiffer, of course.

Of the four (4) things mentioned above we can control the string bed stiffness with ease.  One of the easiest methods is to string your racquet regularly to maintain the effectiveness of the elongation of the string being used.  Elongation relates to energy return in a string and while strings will stay resilient for a long time a well-worn string takes a while to return energy to the ball.

You, the player, of course, determine performance so when using the SFR you can enter a high UTR or Style rating or a low UTR or style rating if maximum performance is not required.

MonoGut ZX +ZX Pro…let’s talk about it.

If you have been around Racquet Quest for a while, you know we talk a lot about Ashaway MonoGut ZX and ZX Pro, with ZX Pro being the 17 gauge version. During this post when I use MonoGut ZX it will include the ZX Pro Version, to save pixels!

A few questions need to be answered before we begin:

1. Do you get paid to talk about Ashaway MonoGut ZX?………. No
2. Do you get Ashaway MonoGut ZX free?………. No
3. Do get to spend the summer at a lavish resort in Ashaway R.I. ………. No
4. Why do you do it, then?

The short answer is MonoGut ZX works in so many applications that it is impossible not to talk about it whenever talking about tennis racquet string, arm issues, durability, and performance!

The first thing we need to know about MonoGut ZX is that is not polyester. It is Polyetheretherketone, or PEEK, for short. MonoGut ZX can look exactly like many common polyester strings due to the monofilament format. Monofilament means it is one strand of material and is typically very smooth and shiny.

The appearance is where the similarities end. Without going into a lot of detail, the stiffness of the base material dictates the stiffness of the string, especially in monofilament formats. Every string we get is tested for “stiffness” and entered into our database. This stiffness is converted to Power Potential using proprietary software. Power Potential is easy to understand…the higher the number, the more powerful the string is.

To get to the meat of this topic, we need to know the relative values of these materials.

MonoGut ZX has a power potential of 14.62
Babolat RPM Blast has a power potential of 4.29
LaserFibre Silverline 2 has a power potential of 4.59
Luxilon ALU Power has a power potential of 4.42
Luxilon ALU Power Soft has a power potential of 5.72

There are hundreds of polyester based string, but this gives you some idea as to where they stack up vis-a-vis MonoGut ZX.

Why does this matter? Strings with very low elongation (power potential) get stiffer the harder the ball is hit! So what? So, if you have low power potential, you need to swing harder to get the ball to go as far as it needs to go especially if you are trying to hit with huge topspin.

MonoGut ZX is suited to many playing styles, racquets, and string patterns. That is why so many really good players are currently using it and winning with it.  That is why it is important that we continue to talk about MonoGut ZX!

Maybe it is time to try MonoGut ZX yourself.

Ashaway MonoGut ZX Black

Ashaway MonoGut ZX Pro Natural

And Now This…

In the words of Lord Kelvin (May 1883) “When you can measure what you are speaking about, and express it in numbers, you know something about it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts advanced to the stage of science.”

That is why every racquet we do has over fifty (50) numbers attached to the finished data. Most of these numbers will remain unknown to the client, but for us, it is imperative that we know them.

Numbers Matter!

Which leads me, again, to this very important discussion.

Every day we see a statement from tennis string manufactures claiming, or suggesting, their string is the “softest ever tested” and other claims.  What the heck is “soft” anyway?  There is a lot more to it than meets the eye so we have done significant analysis on bunches of string and can now quantify “soft” as it relates to tennis string.

What is “soft”?
In 1994 I did a presentation for the USRSA in Atlanta. What was the topic?

“Understanding String.”

It is now 2016, and we are still trying to understand string! Especially “soft” polyester based string.

In 1994 PolyStar was the only polyester based string I was familiar with. Since then there are dozens of offerings from anyone that can afford to purchase from manufacturers and market the string. If you have a desire to do it, I applaud you!

In 1989 I started testing string and calculating “power potential.” Why “power potential”? Because “modulus,” “elongation” and “elasticity” didn’t get to the bottom line of string performance quickly enough! The steps to arrive at power potential are many.

For the testing, several calculations take place including “stretching” the string as in a ball impact. The difference between the first calculation and the “stretched” calculation is the power potential!

I have calculated hundreds of power potentials but have not until now quantified “soft.”

I think now is the time!

Under the direction of Dr. Rich Zarda, we have done a tremendous amount of work on this issue so we can now distill this work into the following explanation.

So, what is a “soft” tennis string?

Strings in a tennis racquet carry the ball impact load in two ways:
1) Via the pre-load string tension placed in the strings caused by a stringing machine (and the racquet frame “holding” those tensions in place) and
2) Via additional tensions that develop in the same string caused by the elongation of the strings as they deflect with ball impact.

Both of these conditions occur simultaneously and contribute to the string bed stiffness (SBS, units of lbs./in). Racquet technicians measure SBS by applying a load to the center of a supported string bed and measuring the resulting deflection. Dividing the load by the deflection provides the SBS (lbs./in). The lower the SBS, the more power you have (power here is the ability of the ball to easily rebound from the string bed), but the less control (presumably); the higher the SBS, the less power you have but, the more control you have (presumably).

One more point about SBS: the lower the SBS, the less the load your body will feel for a given swing. But for an SBS too low (less than 50-80 lbs./in), balls will be flying off your racquet going over the fence; and for an SBS too high (greater than 200-240 lbs./in), the racquet will hit like a board with significantly less ball rebound. So the most common SBSs are between 100-200 lbs./in: a balance between control and power.

As already expressed, SBS is a function of the pulled string tension and the string elongation. Here is what is interesting: For large string elongations (for example, greater than 15%) and reasonably pulled string tensions (greater than 30-40 lbs.), SBS only depends on the pulled string tension, and it does not depend on string elongation. Additionally, for this condition, SBS, for these high elongation strings, does not change as a ball is hit with more impact.

linearity_noname

But for a string bed with low elongation strings (less than 5%) under low pulled tensions (less than 20 lbs., or tensions that have been reduced due to racquet deformation and/or string tension relaxing with time), the SBS additionally depends on the string elongation and will significantly increase, in a nonlinear ever-increasing way, for harder ball impacts.

In order to achieve a repetitive feel for a player when hitting with a racquet, it is best to have an SBS that is independent of an increasing ball impact force. This will lead to a more consistent playability of the racquet, which includes a more repetitive feel. This desired “feel” implies using high elongation strings (greater than 10%). If low elongation strings are used (less than 4%), the SBS will significantly increase as the ball impact force increases, resulting in a racquet feeling “boardy” for higher impact loads. And low elongation strings will cause un-proportionally increasing load into the body.

deflections

As you can see by the graph, elongation contributes to SBS in a big way. The red line indicates a stiff string, about 4%, and the blue line indicates a “soft” string, about 15% elongation. You can see the loads increase dramatically as the impact increases. So the harder the hit the higher the loads on the body.

So to the question asked at the start “What is a soft tennis string?” In the context of the SBS discussed above, I would suggest that a soft tennis string is one whose elongation is 10-15%, and a stiff tennis string is 4-6%. And any string under 4% should be categorized as ultra-stiff.

String elongation (soft, stiff, ultra-stiff),  stringing machine strung tension, and string pattern(s) all contribute to SBS and SBS is an important measure of how a racquet plays and should be adjusted for an individual player, stiff and ultra-stiff strings can lead to less-repeatable racquet performance and player injury.

Soft = 10 -15% Elongation                Power Potential Range = 10.0 – 16.0
Stiff = 4 – 6% Elongation                   Power Potential Range = 4.0 – 7.0
Ultra Stiff =  Less than 4%               Power Potential Range = .65 – 3.96

 

What is “Soft”?

What is “soft”?
In 1994 I did a presentation for the USRSA in Atlanta. What was the topic?

“Understanding String”.

It is now 2016 and we are still trying to understand string! Especially “soft” polyester based string.

In 1994 PolyStar was the only polyester based string I was familiar with. Since then there are dozens of offerings from anyone that can afford to purchase from manufacturers and market the string. If you have a desire to do it I applaud you!

In 1989 I started testing string and calculating “power potential”. Why “power potential”? Because “modulus”, “elongation” and “elasticity” didn’t get to the bottom line of string performance quickly enough! The steps to arrive at power potential are many.

For the testing, several calculations take place including “stretching” the string as in a ball impact. The difference between the first calculation and the “stretched” calculation is the power potential!

I have calculated hundreds of power potentials but have not until now quantified “soft”.

I think now is the time!

Dr. Rich Zarda has done a tremendous amount of work on this issue so we can now distill this work into the following explanation.

So, what is a “soft” tennis string?

Strings in a tennis racquet carry the ball impact load in two ways:
1) Via the pre-load string tension placed in the strings caused by a stringing machine (and the racquet frame “holding” those tensions in place) and
2) Via additional tensions that develop in the same string caused by the elongation of the strings as they deflect with ball impact.

Both of these conditions occur simultaneously and contribute to the string bed stiffness (SBS, units of lbs./in). Racquet technicians measure SBS by applying a load to the center of a supported string bed and measuring the resulting deflection. Dividing the load by the deflection provides the SBS (lbs./in). The lower the SBS, the more power you have (power here is the ability of the ball to easily rebound from the string bed), but the less control (presumably); the higher the SBS, the less power you have but the more control you have (presumably).

One more point about SBS: the lower the SBS, the less the load your body will feel for a given swing. But for an SBS too low (less than 50-80 lbs./in), balls will be flying off your racquet going over the fence; and for an SBS too high (greater than 200-240 lbs./in), the racquet will hit like a board with significantly less ball rebound. So the most common SBSs are between 100-200 lbs./in: a balance between control and power.

As already expressed, SBS is a function of the pulled string tension and the string elongation. Here is what is interesting: For large string elongations (for example, greater than 15%) and reasonably pulled string tensions (greater than 30-40 lbs.), SBS only depends on the pulled string tension and it does not depend on string elongation. Additionally, for this condition, SBS, for these high elongation strings, does not change as a ball is hit with more impact.

linearity_noname

But for a string bed with low elongation strings (less than 5%) under low pulled tensions (less than 20 lbs., or tensions that have been reduced due to racquet deformation and/or string tension relaxing with time), the SBS additionally depends on the string elongation and will significantly increase, in a nonlinear ever-increasing way, for harder ball impacts.

In order to achieve a repetitive feel for a player when hitting with a racquet, it is best to have a SBS that is independent of an increasing ball impact force. This will lead to a more consistent playability of the racquet, which includes a more repetitive feel. This desired “feel” implies using high elongation strings (greater than 10%). If low elongation strings are used (less than 4%), the SBS will significantly increase as the ball impact force increases, resulting in a racquet feeling “boardy” for higher impact loads. And low elongation strings will cause un-proportionally increasing load into the body.

deflections

As you can see by the graph, elongation contributes to SBS in a big way. The red line indicates a stiff string, about 4%, and the blue line indicates a “soft” string, about 15% elongation. You can see the loads increase dramatically as the impact increases. So the harder the hit the higher the loads on the body.

So to the question asked at the start “What is a soft tennis string?” In the context of the SBS discussed above, I would suggest that a soft tennis string is one whose elongation is 10-15%, and a stiff tennis string is 4-6%. And any string under 4% should be categorized as ultra-stiff.

String elongation (soft, stiff, ultra-stiff),  stringing machine strung tension, and string pattern(s) all contribute to SBS and SBS is an important measure of how a racquet plays and should be adjusted for an individual player, stiff and ultra-stiff strings can lead to less-repeatable racquet performance and player injury.

Soft = 10 -15% Elongation             Power Potential Range = 10.0 – 16.0
Stiff = 4 – 6% Elongation               Power Potential Range = 4.0 – 7.0
Ultra Stiff =  Less than 4%            Power Potential Range = .65 – 3.96

What is a “mis-hit”?

I posted recently the sad results of a mis-hit but I don’t think that term has been properly discussed. So, let’s talk about it now.

In the post I also mentioned the word “shank” and in fact, that may be more descriptive of what happens.

Mis-hits DSC02449or Shanking is the “hard” collision of the ball hitting the string and the racquet frame at nearly the same time. This impact causes huge shear loads, like a scissor, and is accompanied by an “impulse”. That means the load is applied over a very short time period, or, in other words, a sharp blow.

A reasonable question, then, is “why does it usually break around the top of the racquet?” The short answer is that the top of the racquet is moving faster than any other part of the racquet with great leverage , therefore, the load has no place to go except into the string. If, however, the mis-hit occurs around the side of the racquet it can “rotate” in your hand and mitigate the load. That is why we see very few failures around the side of the racquet.

I have found that most mis-hits happen with younger players that are very aggressive naturally and are, at the same time, experimenting with different strokes, serves, grips, and spin. All of these things can cause mis-hits and the string failure associated with them.

In most cases mis-hits can be eliminated, by the player, through concentration on impact location, such as trying to hit the center of the string bed, however, on occasion, seldom I hope, the concentration is not there or the desire to return a shot takes precedent over concentration!

String News

As you know I do a lot of string evaluations for myself, my customers and some manufacturers. I do this to have a clear understanding of what a string does at various tensions in various racquets ,and, also in a “controlled” environment!

So, if you ask me for a recommendation my answer will based on data, and, of course some anecdotal evidence. I know most manufacturers try very hard to place the string into the correct category but sometime they simply miss!

There is an ongoing conversation(s) regarding the categorization of polyester based strings relative to racquets and player stature.  This may, for example, look like; “If you use Racquet “X” and are under fourteen (14) years old do not use “XYS” string at tensions higher than 40lbs (18.1 Kilo)”.

Linearity Graph

It is well known that it is very “tricky” to use polyester based string for most younger players that are experimenting with stroke production and still do not have the physical strength to really take advantage of what polyester may offer. For the record I do not recommend it.

Durability is always an issue so when I ask for “playing time” it should be in hours, not days or weeks, but hours. It is a big help to know what portion of those hour are training or playing. It is obvious that one (1) hour of training will be more “destructive” than one (1) hour of tournament play.

The more we know about string the better the choices can be.  It is my imperative that the string matches/enhances the application. Tennis Warehouse, the premier online source for tennis stuff, is also very active in the effort to enlighten players in the selection of the string they order. We can do this!

What do you think?

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