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The strings are designed to stretch in a direction perpendicular to the string plane, but they also move and stretch slightly in a direction parallel to the surface. Excessive movement of the strings parallel to the surface is for bidden by the rules of tennis because it allows a player to impart excessive spin to the ball. It is mainly for this reason that the cross strings must be woven alternately under and over the main strings. Strings that are not woven in this manner were available in the 1970's as spaghetti strings. These were quickly banned because they allowed the string plane to store elastic energy in a direction parallel to the surface, with the result that extra spin was imparted to the ball. Similarly, one could impart additional backspin to a golf ball or a baseball using a club or bat with a rubber surface. The ball would travel a greater distance, partly due to the additional lift force and partly because the impact would be softer, less energy would be di
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The strings are designed to stretch in a direction perpendicular to the string plane, but they also move and stretch slightly in a direction parallel to the surface. Excessive movement of the strings parallel to the surface is for bidden by the rules of tennis because it allows a player to impart excessive spin to the ball. It is mainly for this reason that the cross strings must be woven alternately under and over the main strings. Strings that are not woven in this manner were available in the 1970's as "spaghetti" strings. These were quickly banned because they allowed the string plane to store elastic energy in a direction parallel to the surface, with the result that extra spin was imparted to the ball. Similarly, one could impart additional backspin to a golf ball or a baseball using a club or bat with a rubber surface. The ball would travel a greater distance, partly due to the additional lift force and partly because the impact would be softer, less energy would be dissipated in the ball and hence the speed of the ball off the club or bat would be greater.
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9
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