Aerodynamic forces were derived from the data analysis of high-speed video image of ski jumping flight, which was taken at Hakuba Ski Jumping Stadium in Japan. Initial 40 m parts of flights were recorded by a fixed high-speed video camera at a frame rate of 250 frames/s. The primary target of the present study is to extract the aerodynamic force data during real jumping flights, in particular, in the initial phase of a quasi-steady flight between 1 and 2 sec. after take-off. It is concluded the present aerodynamic force data derived from the image analysis are found to be in fair agreement with existing wind tunnel data for the cases of jumping flights in the quasi-steady flight phase. The aerodynamic data in the cases of relatively large forward leaning angle, which is typical in the initial phase of a jumping, could also be obtained. In addition, data of an Olympic team jumper and a high school jumper are compared to discuss the detail of their flight skills.
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