Racquet Contribution To Shot Tool

Racquet Contribution Tool

Incoming Ball Speed: Racquet Tip Speed: Choose Racquets To Compare
Racquet ARacquet B

21%
20%

26%
26%

32%
32%

26%
26%

24%
25%

32%
33%

39%
39%

32%
33%

24%
25%

37%
37%

43%
43%

37%
37%

48%
47%

— Test Point Locations —
Vertical: 16, 19, 21, 23, 25 in. from butt.
Horizontal: 0, -3, -2, 2, 3 in. from center.

Spec	Wilson Burn 100 S	Babolat Pure Drive 2015
Length (in)	27.00	27.00
Headsize (in²)	97	100
Weight (g)	327	322
Balance (cm)	32.00	32.40
Swingweight (kg*cm²)	315	319
Flex (RDC)	75	72
Twistweight (kg*cm²)	13.45	14.9
Vibration (Hz)	178	163

Key Points

Assumption 1: both racquets are swung at the same speed.
Assumption 2: racquets and ball both travelling parallel to ground with collision perpendicular to stringbed.
The racquet contribution is the percentage of shot speed added by the racquet's inherent power potential.
The racquet's power potential is constant, but its contribution to shot speed changes with swing speed and incoming ball speed.
The greater the ratio of incoming ball speed to impact location speed, the greater the racquet contribution to the shot.
The greater the impact location speed to incoming ball speed, the lower the racquet contribution.
Racquet contribution depends on the hitting location.
Racquet contribution is greatest for volleys, least for serve, and medium for ground strokes.
Contribution decreases from throat to tip and toward the periphery.
Slower strokers get more out of their racquets than faster strokers.
Changes in swing speed, ball speed, and location make bigger differences in racquet contribution than changes in racquet.
See Also:

Explanation

Ingredients of Racquet Power Contribution

Racquet contribution to shot speed is a fun way to look at racquet power. It is really combining the shot speed, power potential and hittingweight tools into another perspective. The racquet contribution is calculated as the racquet's bounce speed at the impact location divided by the shot speed. The relationships that go into that calculation are these:

Power potential = rebound speed / impact speed.
Impact speed = incident ball speed + impact location speed.
Bounce speed = power potential x impact speed.
Shot speed = impact location speed + location bounce speed.
Racquet power contribution = location bounce speed / shot speed.

Power potential is the key racquet parameter. It is determined primarily by mass and mass distribution.