Madeline Hauptman designed her three-directional racket because she enjoyed playing tennis, but, as an artist, her precious painting arm was very sensitive to the vibrations she felt when playing with conventionally-strung frames. Madeline created the prototypes and it was proven that MAD RAQ rackets significantly reduced vibration transmitted to a player's arm, while simultaneously offering great playability. Madeline sold MAD RAQ tennis rackets and licensed her patent to several companies, selling more than 500,000 racquetball rackets and 10,000 tennis rackets with the MAD RAQ stringing pattern.

However, MAD RAQ's stringing pattern was too complicated for many stringers, because it required three sets of strings (one vertical set interwoven with two opposite diagonal sets) instead of the conventional two sets of vertical and horizontal strings.

In 2000, PowerAngle was created as the next generation of uniquely-strung tennis rackets. PowerAngle Rackets, featuring two sets of diagonal strings, are much easier to string than MAD RAQ rackets, yet still offer excellent playability and ideal arm comfort. PowerAngle's equal-length diagonals disperse impact better than conventional strings, which are unequal in length and vibrate at different frequencies.