Customization Results (be sure to click units buttons)
Length and Width (if twistweight) To Add Weight
Weight to Add or Subtract
New Weight
New Balance
New Swingwt (kg·cm²)
New Twistwt (kg·cm²)
New Power % (center)
New PlowIndex % (center)
New Power % (3/9 O'clock)
New PlowIndex % (3/9 O'clock)
in.cm
L
W
ozgm
L
W
Tips and Instructions
Power Potential: The percentage of impact speed returned by the bounce of the ball from the racquet.
Plowthrough Index: The percentage of pre-impact racquet velocity remaining at the impact location immediately after impact.
L and W locations:"L" is for lead placement location on the length of the racquet measured from the butt. "W" is for placement location on either side of the lengthwise center line. If you do not include twistweight in the original specs, then do not fill in the "W" location. It only affects calculations of twistweight and power and plowthrough at 3 and 9 O'clock.
TAB or CLICK out of input cells to get results (both a lengthwise location and amount must be entered in each row).
ENTER UNITS: If you don't, default units will be selected which may not be appropriate to the numbers you enter. Many people in tennis think in mixed units depending on the spec. The worksheet gives you maximum flexibility to match units to the way you think. But it also gives many chances to flub it up. Be careful to make units and numbers match.
TWISTWEIGHT is optional, since many people don't know the twistweight of their racquet. If you don't enter twistweight, you will not get results for the 3 and 9 O'clock power and plowthrough. If you CLICK TWISTWEIGHT in the top table, you can find and use TWU's twistweight for your racquet.
Output units are in the same units as the racquet specs that you entered in the top table.
Cumulative percent changes from the original racquet are located below the parameter in each result cell. These are not percent changes from the previous step.
Positive and negative (add/subtract) weights are allowed (e.g., negative for shaving off bumpers or changing grips, etc.).
You can change any input cell at any time.
If you don't fill in the starting specs, most of the results will be useless.
You can add up to a total of 5 rows for additions/substractions of weight.
You can delete all rows but one.
Enter balance as cm from end of racquet (NOT points headlight or headheavy).
Good tool for WHAT-IF SCENARIOS: for example, what-if I use this vibration damper instead of this one? What-if I shave 5 grams from the bumper here? What if I use this overwrap instead of this grip? What-if I add 20 grams of lead tape to the handle? What if I do all of the above?
When calculating effect of bumper removal, grip replacement, etc., figure the weight location difference at the halfway point of the total distance covered by the element you are changing (for example, if the difference in grips is 5 grams and the grip runs 16 cm up the handle, then enter the +/- 5 grams at 8 cm).
This tool is more of a trial and error and reverse engineering tool. If you have a racquet and know what you want its specs to be, or if you are racquet matching, the Customization Tool might be a better tool for the job. It automatically tells you where and how much weight to place. It always find the answer closest to a solution with a 2 and 10 O'clock placement of lead, since that placement maximizes all variables.
