Tim recently posted a good review of the Wilson Ultra 100 CV and I thought it would be fun, and just maybe informative, to see what an alternative string, tension, and machine would have on the data.
This presentation is to visualize what a difference can be made by racquet technicians through understanding what affects the performance of a racquet.
A few things stand out:
| Property | Technician 1 | Technician 2 | Variable | Percent |
|---|---|---|---|---|
| Tension Set | 58 | 55 | -3 | 5.1 % |
| FF, ASPS | 61 | 64 | +3 | 4.6 % |
| RDC, ASPS | 71 | 52 | +19 | 26 % |
| DT | 41 | 33 | +8 | 19.5 % |
| Effective Stiffness | 35.2 | 30.0 | +5.2 | 14.7 % |
Technician 1 uses a string with a Power Potential of about 9%, technician 2 uses a string with a Power Potential of 13.6%, and technician 2 uses a lower tension setting. The essential number as far as I am concerned is the "Effective Stiffness". This represents the stiffness of the string bed combined with the racquet stiffness. As you would expect the 18 gauge is "softer".
Here is the rest of the data.
| Manufacturer | Wilson |
|---|---|
| Racquet Model | Wilson Ultra 100 CV V2.0 |
| Reference Tension | 55 |
| String | Ashaway Dynamite 18 Soft |
| Machine Strung on | True Tension Pro |
| ASPS, RDC | 52 |
| ASPS, FlexFour | 64 |
| Racquet Flex, RDC | 71 |
| Racquet Flex, FlexFour | 69 |
| Weight, Gram | 324 |
| Weight, Ounces | 11.43 |
| Balance, mm | 333 |
| Balance, In | 13.11 |
| Length, Cm | 68.45 |
| Length, In | 26.93 |
| Head Width | 9.88 |
| Head Length | 13.00 |
| Head Area,Cm | 650.5 |
| Head Area, Sq. In | 100.8 |
| Number of Main Strings | 16 |
| Number of Cross Strings | 19 |
| Ratio Cross/Mains | 0.640 |
| Main String Grid | 7.32 |
| Cross String Grid | 9.61 |
| Density | 0.692 |
| Average Cross String Spacing | 0.507 |
| Average Main String Spacing | 0.453 |
| Dynamic Tension, Kp, ERT | 33 |
| Dynamic Tension, Lbs/In | 184.57 |
| First Moment, Nm | 0.836 |
| Polar Moment | 335 |
| Torsional Stability | 17(the difference between polar moment and swing weight) the higher the better. |
| Swing Weight, Gram | 318 |
| Swing Weight, Ounce | 11.22 |
| Swing Weight Calculated | 359.3 |
| Power, RDC | 56 |
| Control, RDC | 44 |
| Maneuverability, RDC | 75 |
| Power, Calculated | 2276.4 |
| Head Points | 2.83 (negative number = head heavy) |
| Head Weight % | 48.7 (% weight distributed toward head) |
| Center of Percussion | 20.5 (location from the butt to the point creating minimum rotation on ball impact) |
| Dwell Time, Ms | 8.82 |
| Effective Stiffness | 30.0 |
| K, lb/in | 166.67(weight required to deflect string bed 1 inch) |
| Recoil Weight | 144.51 |
| Twist Weight | 235.98 |
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