Patent ID: 8808121

Claim:
A tennis racquet capable of being tested under a tennis ball spin test under which the racquet is securely mounted to a test fixture by four spaced apart mounts such that a plane defined by a string bed is positioned 30 degrees from horizontal, a tennis ball is projected from a ball projecting machine to the string bed at a speed within the range of 38 to 42 miles per hour from an angle that is 50 degrees from an axis normal to the plane of the string bed, and the ball and the string bed are monitored under a high speed video system at 5000 frames per second, the racquet comprising: a frame extending along a longitudinal axis and including a head portion coupled to a handle portion, the head portion including a hoop having inner and outer peripheral walls, the hoop defining a head size having a maximum longitudinal dimension, a, and having a maximum transverse dimension, b, the longitudinal dimension a being at least 1.2 times the transverse dimension b, the inner peripheral wall including a plurality of string holes; and a quantity of polyester, monofilament racquet string having a diameter within the range of 1.10 to 1.55 millimeters, the racquet string coupled to the head portion to form the string bed, the string bed including a plurality of cross string segments interlaced with a plurality of main string segments, the plurality of main string segments being within the range of 14 to 20 main string segments, and the plurality of cross string segments being within the range of 11 to 19 cross string segments, each of the cross string segments transversely extending from one of the string holes to another one of the string holes, and each of the main string segments substantially longitudinally extending from one of the string holes to another one of the string holes, the string bed being strung at a tension of 60 lbs and having at least one more main string segment than cross string segment, wherein when the racquet is tested under the tennis ball spin test, at least one of the main string segments contacting the tennis ball exhibits a snap back velocity of at least 1 meter per second.