![]() ![]() The primary interests of this study were the effect on spin and rebound angle of changing string pattern and material. If you don't control for all these factors, then you can't confidently attribute causality to any particular phenomenon of interest. To examine the effect of changing any one of these, you have to control for all the others because even small changes (especially incident spin, speed, and angle) can make large differences in spin. Among these are the incident spin, speed, and angle of the ball the speed, angle, and tilt of the racquet the string material and properties such as energy return, stiffness, coefficient of friction, and tension and the string pattern and spacing. Studying spin is difficult because it depends on many factors. But how do you choose? What factors really matter to spinning a tennis ball? Why do they matter? How do you maximize the effect of those causal factors? Racquet and string advertising proclaim the spin benefits of particular products and players agonize over which racquet-string setup will generate the most spin. Spin is an essential part of today's game of tennis. CLICK to visit the companion photo gallery and database containing images at maximum impact and all data for each impact. Right: A 3-plane faux spaghetti pattern in action.Ĭompanion Photo Gallery and Database. Inset: The authors thank Michael Raymundo for the use of the Fisher courts at Sydney University. ![]() Crawford (left) and Rod (right) admiring their handiwork. ![]()
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