Numbers, numbers, numbers! What do they mean?
With each of our racquet reviews a long list of numbers is included. It has been a few years since we explained what these numbers mean so here it is;
Manufacturer | Head |
---|---|
Racquet Model | Head Radical MP 2023 |
Reference Tension | 55 (what you tell the stingers to set the stringing machine). This should be replaced by String Bed Stiffness (SBS) |
String | MonoGut ZX Pro |
Machine Used | True Tension Professional |
String Bed Stiffness - RDC | 53.0 Units (Babolat RDC) |
String Bed Stiffness -FlexFour | 64.9 pounds (Flex Four) |
String Bed Stiffness - SBS | 51.8 pounds (Racquet Quest string bed stiffness SBS Master) |
String Bed Stiffness - ERT | 35 Kg/Cm (previously Beer's ERT1000) |
Racquet Flex, Babolat RDC | 65 - After stringing (unstrung racquets will be slightly stiffer. Loaded from the tip) |
Racquet Flex, FlexFour | 44.5 (Loaded from the COP) |
Racquet - In Plane Stiffness | 379.7 lbs/Inch (stiffness across the 3 ad 9 o'clock positions of the racquet head) |
Weight, Grams | 326 |
Weight, Ounces | 11.50 |
Balance, mm | 333 |
Balance, Inch | 13.11 |
Length, Cm | 68.57 |
Length, Inch | 27.00 |
Head Width | 9.63 |
Head Length | 12.79 |
Head Area, cm2 | 623.0 |
Head Area, Sq. Inch | 96.7 |
Beam Height @ Grip, mm | 21.0 (how thick the racquet is looking at the side) |
Beam Height @ Mid, mm | 22.5 (how thick the racquet is looking at the side) |
Beam Height @ Tip | 20.5 (how thick the racquet is looking at the side) |
Beam Width @ Grip, mm | 12.5 (how thick the racquet is looking at the front or face view) |
Beam Width @ Throat, mm | 11.5 (how thick the racquet is looking at the front or face view) |
Beam Width @ Mid, mm | 12.8 (how thick the racquet is looking at the front or face view) |
Beam Width @ Tip, mm | 12.8 (how thick the racquet is looking at the front or face view) |
Number of Main Strings | 16 |
Number of Cross Strings | 19 |
Ratio Cross/Mains | .634 ( typically the natural ratio) |
Main String Grid | 7.18 (the distance between the two outer most main strings) |
Cross String Grid | 9.44 (the distance between the two outer most cross strings) |
Density (% of head filled with string) | 69.6% (how much of the head area is filled with string) |
Average Cross String Space | .494 (how far apart the strings are). The farther apart the quicker the wear. |
Average Main String Space | .449 (how far apart the strings are). The farther apart the quicker the wear. |
Dynamic Tension, Kp, ERT | 35 (string bed stiffness in kilos per centimeter) |
Dynamic Tension, Lbs/in | 195.76 (DT converted to pounds per inch) |
First Moment, Nm | .841 (sometimes called pickup weight) |
Polar Moment | 347 (torsional weight) |
Torsional Stability | 16 ( resistance to twisting on off center hits) |
Swing Weight, Kg/cm2 | 331 (the dynamic weight and the most significant property) |
Swing Weight, Ounces | 11.68 |
Swing Weight Calculated | 361.5 (calculated from the butt end to the tip) |
Power, RDC | 52 (property calculated by Babolat RDC) |
Control, RDC | 49 (property calculated by Babolat RDC) |
Manueverability, RDC | 66 (property calculated by Babolat RDC) |
Power, Calculated | 2101.4 (calculation based on several racquet properties) |
Head Points | 3.15 ( a point is generally consider to be .125 inches/3.18mm) |
Head Weight, % | 48.5% |
Center of Percussion | 21.1 (highest COR) |
Dwell Time, ms | 8.74 (length of time the ball is in contact with the string without a swing) |
Efective Stiffness - lbs | 29.2 ( the calculated combined stiffness of the racquet and sting bed) |
K, Lb/In | 169.87 (string bed stiffness in pounds/inch) |
Recoil Weight | 156.44 (resistance to twisting about the grip) |
Twist Weight | 226.48 (resistance to twisting about the neutral axis) |
End Weight | 126.0 (two scale system to calculate CG) |
Tip Weight | 197.7 (two scale system to calculate CG) |
9 O'Clock | 105.1 (three scale system to assure symmetry) |
3 O'Clock | 104.7(three scale system to assure symmetry) |
Butt Cap | 115.6 (three scale system to assure symmetry) |
COF, Main | .416 (the stickiness of the string bed sliding the ball with the main strings) |
COF, Cross | .388(the stickiness of the string bed sliding the ball with the cross strings) |
Posted on February 16, 2023, in Evaluation, Learning. Bookmark the permalink. Leave a comment.
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