String load apportioned racket

Details String load apportioned racket String load apportioned racket

A - Human Necessities

63

B

273/163

A63B 49/00 (2006.01)

Patent

CA 1179388

-24- TITLE STRING LOAD APPORTIONED RACKET ABSTRACT Longitudinal strings 15 or 25 of tennis or other sports rackets 10 or 20 are lengthened to be at least 30% longer than transverse strings 17 or 27 and are strung with at least 30% more tension than the transverse strings. The longitudinal strings are also functionally related in length and tension to the transverse strings to effec- tively apportion to the longer longitudinal strings from approximately half to substantially more than half of the string force for decelerating a ball penetrating the string network as the ball is hit. The functional rela- tionship for selecting appropriate lengths and tensions for the longer and shorter strings is mathematically derived, analyzed, and related to practical working mechanics of a string network. The advantages of lengthening 9 tightening, and apportioning more of the load to the longitudinal strings include a higher coefficient of restitution for the string network; a larger and more responsive sweet spot area; smaller hysteresis losses from string stretching; less interstring friction and ball deformation; higher velocity ball rebound; better shot control; and less torque shock to the arm of the user from off center hits.

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