Category Archives: Kinesiology

Yonex VCore Pro 97 – 330

It should be no surprise that this model is the heaviest of the VCore Pro Series!  However, I can’t stress enough the need to demo this racquet and feel what the weight will do for your game!

Of course not everyone will want a racquet of this weight but just trying it will give you some idea of what weight can do for you.  Maybe not 330 (unstrung) but a little added weight nonetheless.

That makes the 310 (unstrung) version of this racquet a “standout”, and you can see the review here.

About this racquet, Yonex says “for intermediate to advanced players looking to play aggressively with control and feel”.

To achieve this combination Yonex has incorporated a “lock booster” grommet system that promotes string contact for effecient energy transfer”.

Namd™ graphite fibers are incorporated into the throat area allowing the racquet to flex even under the heaviest of hits!

To top it off Yonex has added a vibration damping mesh in the grip pallet area to filter out unwanted vibrations.

All said, this thin beam (20.0mm) racquet with a 16×19 string pattern is a players dream!  So, don’t dream about it…demo it and decide for yourself!

 

ManufacturerYonex
Racquet ModelYonex VCore Pro 97
Reference Tension55 lbs - 24.9 kg
String
Pro Evaluation String 1.20mm
Machine UsedTrue Tension Professional
Static
ASPS, RDC53
ASPS, FlexFour66
Racquet Flex, RDC62 - After stringing
Racquet Flex, FlexFour48
Racquet - In Plane Stiffness373.2 lbs/Inch
Weight, Grams344
Weight, Ounces12.13

Balance, mm321
Balance, Inch12.64
Length, Cm68.6
Length, Inch27.008
Head Width9.56
Head Length12.62
Head Area, cm2611.3
Head Area, Sq. Inch97
Number of Main Strings16
Number of Cross Strings19
Ratio Cross/Mains.638
Main String Grid7.00
Cross String Grid9.62
Density (% of head filled with string).709
Average Cross String Space.505
Average Main String Space.438
Dynamic
Dynamic Tension, Kp, ERT34
Dynamic Tension, Lbs/in190.16
First Moment, Nm.847
Polar Moment342
Torsional Stability15
Swing Weight, Kg/cm2327
Swing Weight, Ounces11.53
Swing Weight Calculated354
Power, RDC49
Control, RDC51
Manueverability, RDC69
Power, Calculated 1940.1
Head Points6.93 (negative = head heavy)
Head Weight, %46.8%
Center of Percussion20.9
Dwell Time, ms8.74
Efective Stiffness - lbs28.6
K, Lb/In169.87
Recoil Weight161.48
Twist Weight235.86
End Weight 144.4
Tip Weight 201.5
9 O'Clock102.6
3 O'Clock104.8
Butt Cap138.0

 

 

Pssst…want to try something?

If you read our recent post about “How to Demo a Racquet,” you may be incentivized to do it!

So while you are at it try one of our performance racquets setup with MonoGut ZX or ZX Pro (thinner) to get the maximum performance from the racquet.

Ashaway MonoGut ZX and ZX Pro have been one of our most popular strings for well over five (5) years!

Top players have been using it, but now the word is spreading that is not just for “the good player” but for everyone! We are very sensitive to injuries and injury prevention, so that is why we recommend MonoGut ZX to almost all players. The durability and feel of this string are unique, and, MonoGut ZX and ZX Pro is a monofilament but is PEEK and no polyester.

As with any string, some will not want to change, but if you are looking for a new racquet, why not demo a racquet setup with MonoGut ZX or ZX Pro?

MonoGut ZX & ZX Pro

Ashaway MonoGut ZX and ZX Pro come in Black and Natural and 16 (1.27mm) and 17 (1.24mm) gauge.

Head Graphene 360 + Gravity S

Here is where it gets interesting!  This racquet, the Gravity S, is a realtivley thin beam 104 square inch racquet!

It has been a while since Head has presented this head size in a player oriented racquet!  This 296 gram (10.44 ounce) racquet fills a serious need, in my opinion, for a “players” 104!  The 24mm beam allows the stiffness to reflect the new “Spiral Tech” fiber placement.

Model Comparison

I believe this racquet will appeal to serious adults seeking a comfortable racquet  (RDC 56 strung) that can elevate their game.

This racquet has plenty of “cutomization” potential which makes it great choice for quickly advancing players.

Stop by and feel this combination for yourself, and take the demo for a real test on the court!

 

 

ManufacturerHead
Racquet ModelHead Graphene 360 + Gravity S
Reference Tension55 lbs - 24.9 kg
String
Head Velocity MLT Black
Machine UsedTrue Tension Professional
Static
ASPS, RDC56
ASPS, FlexFour64.0
Racquet Flex, RDC55 - After stringing
Racquet Flex, FlexFour45
Racquet - In Plane Stiffness304.6 lbs/Inch
Weight, Grams296.0
Weight, Ounces10.44

Balance, mm329
Balance, Inch12.95
Length, Cm68.6
Length, Inch27.008
Head Width10.15
Head Length13.19
Head Area, cm2678.4
Head Area, Sq. Inch105.2
Number of Main Strings16
Number of Cross Strings20
Ratio Cross/Mains.616
Main String Grid7.25
Cross String Grid9.87
Density (% of head filled with string).680
Average Cross String Space.495
Average Main String Space.453
Dynamic
Dynamic Tension, Kp, ERT37
Dynamic Tension, Lbs/in206.9
First Moment, Nm.752
Polar Moment306
Torsional Stability14
Swing Weight, Kg/cm2292
Swing Weight, Ounces10.30
Swing Weight Calculated320.4
Power, RDC35
Control, RDC68
Manueverability, RDC92
Power, Calculated 1705.7
Head Points4.41
Head Weight, %48.0%
Center of Percussion20.9
Dwell Time, ms8.50
Efective Stiffness - lbs27.7
K, Lb/In179.4
Recoil Weight138.9
Twist Weight227.0
End Weight 117.8
Tip Weight 180.8
9 O'Clock91.3
3 O'Clock91.2
Butt Cap114.8

 

Play Like a Girl…Part Deux

If you read “Play Like a Girl,” you will have a good idea where this is headed!  This part is intended to make it possible for you to experiment without feeling “forced” so it is based on “numbers” not “feelings.”  Of course, feel is relevant to tennis players.

Two events this week make it easy to compare numbers and feeling.

  1.  A racquet came in from a tournament playing junior that had the good fortune of picking up a competitors racquet and recognize the difference immediately and wanted to try it.  His racquet is a Babolat Pure Strike 16×19 with a swing weight of 302!  The racquet he picked up has a swing weight of 341!  His revised swing weight is 325.
  2. A really good young lady is switching racquets and string setup, so there is a four (4) inch strip of 1/4″ tape on the inside of each side of the string bed in the 3 and nine o’clock position — total weight of about 5 grams, for a swing weight of 321.  During a training session, a coach said the racquet was too heavy and removed about 2 inches total of tape, maybe 1.5 grams, and everything was fine!  This player is strong enough to play with a 335 swing weight so was this a “visual” suggestion, and the process of removing tape convinced the payer that the racquet was now much lighter?

In case you don’t remember there are 28.35 grams per ounce.  So you can see that 1.5 grams is quite small!

Did you know that a dry overgrip is about 5 grams and a wet over grip can be as much as 12 grams?  The location of an overgrip (under your hand) has virtually no effect on swing weight so it generally goes unnoticed.

Unless agreed upon in advance most weight can be removed or re-located so don’t fear your friend…weight!

 

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!

 

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