EXPERIMENTAL STUDY ON BROACHING OF A SMALL HIGH SPEED BOAT.

Using a radio controlled model, this experiment succeeded in realizing broachng phenomenon on a small high speed boat in the model basin stably. The broaching always occurs when the ship is under surf-riding condition on the front slope of waves and the velocity reaches to almost the same as the wave propagation. Many items of measurement were conducted and behavior of the model ship during the broaching was recorded. As a result, the optimal form of the maneuvering equations was derived and each coefficient was identified. Dynamic balance of each component in broaching condition was discussed. Experimental results on the model basin were compared with those of the ship in seas during the broaching. It was recognized that both records were similar in pattern and agreed well with quantity.