Abstract
The objective of this study was to measure the unsteady fluid force acting on the human body during swimming. For this objective, swimmer mannequin whose size was the half of the actual swimmer was conducted. An experiment to measure the drag acting on the mannequin was conducted in a circulating water tank. The mannequin was driven by the underwater driving device, and the drag was measured by four two-axis dynamometers. In the present report, the effect of rolling on the drag was investigated. From the experimental results, it was found that the drag increased once and decreased according to the increase of the rolling amplitude. However, since this result was found to be affected largely by the drag of bars supporting the mannequin, correction of the drag was attempt.
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