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The paper presents a new method for predicting the hydrodynamic performance of the flap rudder behind a propeller. The hydrodynamics of the rudder was calculated by the panel method and the performance of the propeller was predicted by the simplified propeller theoty. The interaction between the rudder and propeller was determined by iterative procedure. The pressure distribution on rudder surface and the hydrodynamic performance of the flap rudder are discussed in the paper.