著者

原 利次 松井 裕吾 守屋 圭悟

出版者

一般社団法人日本機械学会

雑誌

日本機械学会関東支部総会講演会講演論文集

巻号頁・発行日

vol.2002, no.8, pp.459-460, 2002-03-14

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Trajectory of two-seam and four-seam fast ball were examined experimentally. Each special fast ball was thrown by a baseball player and a pitching machine. They were also compared experimentally. Photograph were taken by a video camera behind the catcher player. Trajectories of their balls were calculated from the photographs. Two-seam fast ball swift occasionally right and left horizontally and sometimes went down vertically. The trajectory was similar to that of other change balls such as slider and curved ball. However, the motion of the pitcher was very similar to that of four-seam fast ball. It was suggested that a batter was difficult to find out fast ball and 2-seam swift ball at a glance of pitcher.