Propulsive performances of fish-like motion have been investigated using waving wing model. It has been said that the fish-like motion achieves high propulsive performances compared with the artificial propulsion systems such as motor and propeller. Present paper describes the analyzed results of hydrodynamic-force and flow-field measurement using waving wing model. The waving wing model was designed and made so as to analyze the basic characteristics of fish-like propulsion in two-dimensional

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... ase. The authors have proposed the definition of dynamic drag coefficient, which enables to know the resistance characteristics of waving-motion object. The basic data was collected in the simple cases, and that has been used to estimate the thrust forces under self-propulsive condition. The results of the analysis of hydrodynamic force have also been considered in connection with the flow field measured by particle image velocimetry (PIV) system.