In this study, because the superstructure of the craft is a simple shape as shown in Photo. 2, the coefficients of wind force and moment are obtained from database of Isherwood as shown in Fig. 12. The simulation studies are carried out to obtain the basic characteristic of maneuvering for the outrigger craft in wind. Accordingly, the turning and the zig-zag maneuver are selected for the simulation studies.

 The effect of the wind force is a very large for the craft in the turning motions because of the draft is shallow. The maximum deviations (SD/Lpp) in the turning motions are shown in Fig. 13. SD is denoted the deviation from trajectory of calm condition as shown in Fig. 14. True wind direction is zero and the model is type-C in this simulation studies. Also, example for simulation results, trajectories are shown in Fig. 14, and the time histories of ship's speed u , yaw rate r and drift angle βare shown in Fig. 15. In this case, wind speed of the simulation is six times as large as ship's speed (WT/U=6) and the rudder angle is 35 degrees. As can be seen, the craft is pushed down the wind about two ship's length, also, yaw rate and drift angle are strongly influenced of wind force in turning motion. The effect of wind is getting more strongly as the rudder angles are less than 10 degrees.

 On the other hand, the effect of wind is rather slight in 10-10 zig-zag maneuver as shown in Fig. 16. The main reason is that the craft has an excellent course keeping ability in the main because the hull is so slender, and the outriggers are large damping of yaw moment. Meanwhile, the true wind direction is -90 degrees in this simulation studies.