Development of high-speed planing hull forms with consideration of resistance and seakeeping performance

Abstract

In this study, several conceptual planing hulls are designed to develop a planing vessel which has good resistance and seakeeping performance. From the operational requirements of the planing hull, its displacement should be less than 3.0 ton, and its speed should be higher than 45 knots. High-speed model tests are performed to predict resistance and seakeeping performance of the designed hulls. Model tests for 1/6.5 scale model ships in calm water and regular waves follow each hull design. First model ship is deep-V type, deadrise angle on its afterbody is around 20 degrees. It shows good resistance performance, but its seakeeping performance is not good. Second model has large deadrise angles on its forebody and the length-to-beam ratio becomes larger. It is favorable to wave-piercing motion in waves, and shows good seakeeping performance. But the required power of second model is larger than that of first model. Third model is designed for a compromise between first and second model. Third model shows medium resistance and seakeeping performance among three model ship. Finally, fourth model shows better resistance and seakeeping performance than third model by the increase of length-to-beam ratio and modification of deadrise angle, chine location..0 ton, and its speed should be higher than 45 knots. High-speed model tests are performed to predict resistance and seakeeping performance of the designed hulls. Model tests for 1/6.5 scale model ships in calm water and regular waves follow each hull design. First model ship is deep-V type, deadrise angle on its afterbody is around 20 degrees. It shows good resistance performance, but its seakeeping performance is not good. Second model has large deadrise angles on its forebody and the length-to-beam ratio becomes larger. It is favorable to wave-piercing motion in waves, and shows good seakeeping performance. But the required power of second model is larger than that of first model. Third model is designed for a compromise between first and second model. Third model shows medium resistance and seakeeping performance among three model ship. Finally, fourth model shows better resistance and seakeeping performance than third model by the increase of length-to-beam ratio and modification of deadrise angle, chine location.