The Head Protector series consisted of two (2) models. The one you see here is the Mid Size model and the most popular as far as I know. The popularity was not mis-placed however! The concept uses a “chip” that reverses the frequency of the impact essentially negating the feeling of vibration in the hand and arm.
This technology, very likely, had no obvious advantage(s) since “vibration” is in the hands of the beholder, simply did not convert to sales.
The technology typically is called piezo technology and has been, no doubt, replaced by various accelerometers in the current “interactive” racquet(s).
The racquet even without the “chip” was a nice hitting racquet and the stiffness was belied by the wide beam. This racquet was not that stiff at an RDC value of 66.
|Racquet Model||Head Protector Mid Size|
|Reference Tension||Not Strung|
|Racquet Flex, RDC||66|
|Racquet Flex, FlexFour||66|
|Head Area, sq cm||663.4|
|Head Area, sq in||102.8|
|Number of Main Strings||16|
|Number of Cross Strings||19|
|Main String Grid||7.20|
|Cross String Grid||9.88|
|Average Cross String Spacing||0.520|
|Average Main String Spacing||0.450|
|Dynamic Tension, KP, ERT||Not Strung|
|Dynamic Tension, Lbs/in||Not Strung|
|First Moment, Nm||0.751|
|Swing Weight, Gram||295|
|Swing Weight, Ounce||10.41|
|Swing Weight Calculated||336.9|
|Power, RDC||Not Strung|
|Control, RDC||Not Strung|
|Maneuverability, RDC ||Not Strung|
|Head Weight, Percent||50.6|
|Center of Percussion||20.9|
|Dwell Time, Ms||Not Strung|
|Effective Stiffness||Not Strung|
|K, lb/in||Not Strung|