Tennis racquet with adjustable frame isolation

A racquet comprising:

• an outer frame defined by a generally hoop shaped portion with a handle extending therefrom;
• an inner frame positionable within said outer frame having a string bed formed from a plurality of cross string elements and a plurality of main string elements;
• and a means for isolating and securing said inner frame to said outer frame constructed and arranged to allow for sway space deflection and to control overall in-plane stiffness between 30 lbs/in and 800 lbs/in and overall out-of-plane stiffness between 70 lbs/in and 600 lbs/in, said means for isolating and securing said inner frame to said outer frame provides a combined and coordinated out-of-plane stiffness of isolators with the string bed only out-of-plane stiffness, whose coordinated combined motion results in a nearly normal rebound of a tennis ball, independent of any ball impact eccentricity to a center of the string bed and is adjustable and combines out-of-plane stiffness, string bed stiffness, and in-plane stiffness to provide increased spin to a ball impacting said string bed wherein any specific isolator is adjusted, using significantly 3×-10× larger in-plane stiffnesses compared to other isolators, which said stiffnesses effectively makes a connection between the inner and outer frame, at that isolator position, a door-hinge pin connection between two structures, where the hinge's rotation axis is normal to the string-bed at that isolator position, which said isolator adjustment allows the inner frame, relative to the outer frame, to achieve a rigid-body in-plane-of-the-string-bed rotation about a hinge line.