Tennis Racquets


 

In collaboration with our partner Division, LLC., we have designed a new type of tennis racquet, the “equalizer”, that represents the first fundamental innovation in tennis since the large-head racket was introduced in 1976.

 

 Conventional rackets

  • a. All current rackets look and play essentially the same.
  • b. All current racket faces have nearly identical oval shapes. These provide strong and light frames, but convey very limited power and control, and have a relatively small sweet spot (about the size of a man’s fist).
  • c. All current rackets require a choice between power (low string tension) and control (high tension).  They cannot provide both; and whatever choice is made, the result is far from optimal.
  • d. Conventional stringing is slow, cumbersome, and highly inaccurate  -- string tensions on all current rackets are very different from those requested, initially, and even more so after play.
  • f. The Equalizer® will change all this.

 

EQUALIZER® CHARACTERISTICS

1Approximately rectangular racket face

  • a. All main strings have approximately the same length and can be independently tensioned to vibrate with the same frequency.
  • b. All  cross strings also have the same (shorter) length, and with suitable string material can be tensioned to vibrate with the same frequency as the mains. 
  • c. Equalized vibration frequency of all strings produces greater power and a sweet spot (SS) at least four times larger (about the size of a man’s face). 
  • d. With this new source of power, and immense SS you can have both power and control.
  • e. The Equalizer®’s large axial moment of inertia reduces the error from off-axis hits.
  • e. Equalized string vibrations reduce the error from hits on adjacent strings.
  • f. The Equalizer®, which provides the first new face look in 150 years, is made possible by the use of innovative new materials, grommets, and stringing protocols.
  • g. Our dramatic new metallic look incorporates improved aerodynamics.

2Integrated lockable grommets

  • a. Enable independent stringing and exact tensioning of each string.
  • b. Enable equal frequencies without equal string lengths.
  • c. Enable rounded corners and a shorter outer side for increased strength and playability.
  • d. Enable lower tensions on (shorter) cross and outer strings, to create an even larger SS.
  • e. Enable rapid stringing with pre-cut strings using a smart-phone “app”.
  • f. Enable easy re-tensioning or replacement of individual strings -- courtside.
  • h. Enable playability even with broken strings.

3Stringing protocols and devices

  • a. New stringing protocol maintains face shape at each step so there are no tension changes.
  • b. Protocol eliminates release shock on frame.
  • c. Protocol enables strong quasi-rectangular face with light weight.
  • d. New stringing device enables fast, automated in-shop stringing, allowing all strings to be tensioned simultaneously.
  • e. Hand-held tensioning device with smartphone “app” enables stringing anywhere – even courtside.

4. Vibration control

  • a. Aerodynamic lightening holes, insulated grommets, and wedge-shape profile all reduce vibrations.
  • b. Patented “Sting Stopper” in handle absorbs and dissipates remaining vibrations, dramatically reducing incidence of  “tennis elbow”.

5. Prototypes

   
  
    
  
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  Fig. 4.1.  Aluminum racquet

Fig. 4.1.  Aluminum racquet

   
  
    
  
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  Fig. 4.2.  Carbon fiber racquet

Fig. 4.2.  Carbon fiber racquet