The sailing performance of a 10.6m-LOA cruiser was evaluated by sea test and the results were compared with calculated values and numerical simulations. The sea test was carried out to examine the steady sailing performance as well as the dynamic performance which includes the motion in waves and tacking maneuverability of the boat. The sailing state parameters at the steady condition were compared with the results of the velocity prediction program, and the results were in good agreement.

The motion of the boat in waves was assessed in conjunction with wave measurements using a throw-in type wave meter. These data were analyzed by means of spectral analysis. The results indicated the sail damping effect on the rolling motion quantitatively. The tacking motion of the boat was also investigated. The trajectory of the boat was measured using differential GPS receivers, and these results were compared with the numerical simulation. The simulation showed good agreement with the sea test data.

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