![]() ![]() A Determination of the Dynamic Response of Softballs,.It is shown that for a given coefficient of restitution (COR), both the intrinsic power and the swing speed of a tennis racquet or baseball bat correlate strongly with the MOI about an axis through the handle and only weakly with the mass. Nathan, Sports Technology 2, 7-15 (2009).īy Rod Cross and myself (Sports Technology, vol. Performance Versus Moment of Inertia of Sporting Instruments,.The backwards bounce is further indication of large amount of backspin on the ball. Note also what happens to the ball when it hits the ground. This is the quintessential paradoxical popup, indicative of a lot of backspin on the ball. Note the third baseman Kevin Cash (normally a catcher) overruns the ball, which initially was headed toward the seats along the third baseline but then veers back towards the field. For another example, take a look at this video taken from a Red Sox vs. It is shown that the normal strategy used by outfielders to intercept fly balls leads to systematic vacillation in running paths for these popups. This paper examines the unusual trajectories of towering popups with lots of backspin. Effect of Spin on the Flight of a Baseball,Īlan M.Experimental Study of the Gear Effect in Ball Collisions,.That handsome fellow holding the bat is Rod. Click here to see a short video clip of the experiment in action. The data are relevant for determining whether a hit curveball has more backspin than a hit fastball. This paper reports on an experiment to study the spin resulting from a low-speed ball-bat collision. This paper is the foundation for modern efforts to regolate the performance of non-wood bats. Using a computational model, it is shown that bat performance depends on the interplay of the elasticity of the ball-bat collision, the inertial properties of the ball and bat, and the bat swing speed. This article defines a set of laboratory measurements that can be performed on a bat and then used to predict performance in the field. (a) usual field frame and the (b) bat rest frame. Schematic of the baseball-bat collision in the ![]()
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