Greater deformation was found for impacts landing on the seam, compared to those landing perpendicular to the seam. For the two orientations of impact, a disparity was found in terms of the force-deflection behaviour. Experiments were carried out to measure the force-deflection behaviour of a cricket ball during a normal impact in two orientations (impacting on the seam and perpendicular to the seam). This paper examines the impact behaviour of a non-homogenous sphere (in this case a cricket ball with a rolled core construction) with a rigid surface. While the results of this study are limited to the specific bats tested, this is the first study to measure and report differences in batted ball speeds among wood and metal bats. Players of all experience levels were able to generate batted ball speeds in excess of 100 mph. Increased skill level significantly increased the maximum batted ball speeds generated independent of bat model. Maximum batted ball speeds of 101 and 106 mph were measured for wood and metal bats, respectively. The average difference in batted ball speed between wood bats and the highest performing metal bat was approximately 9 mph. Of the five metal bat models studied, one outperformed all other models and one bat was most similar to wood bats. In general, metal bats had significantly higher batted ball speeds than wood bats. Batted ball speeds from 538 hits were computed from high-speed 3-D ball position data collected with a commercially available system. Two wood and five metal baseball bat models were studied with 19 players of various levels of experience ranging from high school to professional. Differences in the performance of wood and metal baseball bats, measured as a function of batted ball speed, were quantified in a batting cage study.
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