Rough Water Performance of High Length to Beam Ratio Planing Boats

摘要

Experiments were conducted in waves with several constant deadrise models to assess the rough water performance of high length to beam ratio planing craft. Several models with L/b = 7 and one with L/b = 9 were run in waves to determine the effects on performance of basic design parameters such as speed length ratio, loading coefficient, wave height to beam ratio, deadrise angle, trim angle and length to beam ratio. Charts have been prepared for estimating the pitch and heave motions, vertical accelerations and added resistance in waves of the high L/b craft. Two problems encountered with the models which may present obstacles in the design of high length to beam ratio craft were the extremely high impact loads as indicated by the high impact accelerations and, large quantities of water over the deck resulting from the bow plowing through wave crests. (Author)