The design concept and the hydrodynamic performance of a frigate class trimaran are discussed. A series of resistance tests and numerical calculations were carried out to investigate the influence of side-hull forms, longitudinal and transverse locations on the resistance characteristics, and the propulsion test to investigate the propulsion efficiency. The result shows that powering performance of the trimaran is superior to that of the similar mono-hull ships above the middle speed range. Seakeeping model test for the trimaran was executed in the towing tank, and the result was compared with the theoretical analysis result of the similar mono-hull ship. As a whole, the seakeeping performance of the trimaran is superior to that of the latter. Maneuvering model test using the HPMM equipment was also executed to evaluate the maneuvering performance of the trimaran. The result shows that the control ability of heading angle and the direction keeping stability of the trimaran is excellent even if the turning performance of it is rather worse than that of the similar mono-hull ship.
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