Category Archives: Accuracy

Linearity…again.

A Hybrid View…Part 2

This post is an adjunct to the previous post that did not use polyester as a component.  This one does.
 
This string data is very important to us, and we believe players. Please let us know what other properties you think are important, and we will try to include them in future posts.
 
 
Thank you for watching!
 
 
 
 
 

Three Important Things

When dealing with tennis racquets, there are many significant performance parameters.  We are going to list our three (3) most important ones:

  1. Swing Weight
  2. Overall Weight
  3. Effective Stiffness

These particular parameters are based on machine testing, physics, and experience.

  1. Swing Weight:  we refer to this as a dynamic weight, meaning how heavy or light the racquet feels during the swing to the ball.
  2. Overall Weight: This is normally considered to be the weight found on a scale, electronic, or balance.  Weight is your friend if properly associated with your capabilities and stature.
  3. Effective Stiffness:  is a calculable and measurable stiffness of the ball hitting the string as you are holding the racquet and hitting a ball.

Why is it Important?:

  1. Swing Weight:  contributes to power and stability, which contributes to control.  A higher swing weight of, say, 320 to 340 will handle most incoming balls with ease.  Swing weights of 300 to 319 will be easier to maneuver and require a little more energy from the player to handle aggressive incoming balls.
  2. Overall Weight:  contributes to ease of movement and long play time and must be associated with the stature and style of the player.  The heavier racquet will provide more power with less energy expended by the player.
  3. Effective Stiffness: this is a metric we use to ensure the racquet is within the stiffness range needed by the player.  For example, if you come into the World Headquarters of Racquet Quest for the first time with your current racquet and the strings are intact, we can determine the effective stiffness and, based on your satisfaction with the current playability, arrive at a corresponding effective stiffness…not on a reference tension.  A range of 24 to 30 pounds is acceptable.  Anything over 30 becomes quite stiff and should be avoided by most players.

If you look at our racquet reviews, you will see a lot more than three (3) performance parameters! We believe they are all important, but players should understand the three (3) described here.

If you have any questions please leave them in the “comments” space below…and thank you!

Head Gravity Tour 98-Pre Release Version

If you have listened to our latest podcast, you will know a little about the new Head Gravity Tour 98, to be released in January 2025!

Racquet Quest, LLC has the pre-release version and is excited to share what we can.

The difference between what you may see online and what Racquet Quest, LLC has is we have taken a raw racquet and applied the desired specifications to it.

We see this as a racquet suitable for many playing styles and levels, so we began with a swing weight of 321 and an overall weight of 327.

After Stephanie’s brief video about her reactions to this Gravity Tour 98 racquet, we will return to associate her comments with the numbers in our review! Wouldn’t that be fun?

In Stepahines’ video, she adds several years to the age of her Gravity MP, calling it 2003. Actually, it is 2023.

Now, here’s Stephanie!

Now, the numbers…

ManufacturerHead
Racquet ModelHead Gravity Tour 98 PreRelease
Reference Tension56
String
PEEK 7710
Machine UsedTrue Tension Pro
Static
String Bed Stiffness - RDC49
String Bed Stiffness -FlexFour57.7
Strig Bed Stiffness - SBS43.7
String Bed Stiffness - ERT33Kg/Cm^
Racquet Flex, RDC57
Racquet Flex, FlexFour44.8
Racquet - In Plane Stiffness373.1
Weight, Grams327
Weight, Ounces11.53
Balance, mm325
Balance, Inch12.80
Length, Cm68.6
Length, Inch27.008
Head Width9.827
Head Length12.724
Head Area, cm2633.6
Head Area, Sq. Inch98.2
Beam Height @ Grip, mm21.0
Beam Height @ Mid, mm22.0
Beam Height @ Tip22.0
Beam Width @ Grip, mm10.7
Beam Width @ Throat, mm11.3
Beam Width @ Mid, mm10.5
Beam Width @ Tip, mm12.1
Number of Main Strings16
Number of Cross Strings19
Ratio.650
Main String Grid Inch/mm7.50/190.5mm
Cross String Grid Inch/mm10.38/263.6
Density (% of head filled with string).785
Average Cross String Space.546
Average Main String Space.464
Dynamic
Dynamic Tension, Kp, ERT33
Dynamic Tension, Lbs/in184.57
First Moment, Nm,818
Polar Moment335
Torsional Stability14
Swing Weight, Kg/cm2321
Swing Weight, Ounces11.32
Swing Weight Calculated345.4
Power, RDC51
Control, RDC47
Manueverability, RDC73
Power, Calculated 1814.8
Head Points5.83
Head Weight, %47.3%
Center of Percussion21.1
Dwell Time, ms6.69
Efective Stiffness - lbs26.3
K, Lb/In157.05
Recoil Weight157.80
Twist Weight236.02
End Weight 132.2
Tip Weight 192.1
9 O'Clock91.6
3 O'Clock90.8
Butt End143.1
COF, Main.378
COF, Cross.386