Design and construction of high spreed ,hard chine planning hull

Abstract

With the development of the tourism in the country, there will be potential demand for water sports and leisure boating industry as in Maldives Island and other developed countries. Export development board and other related industries are in a process of development of industry related yachting, pleasure boating and marina in the country. Aim of this research project was establishing ground works in design and development of such craft and commences the same industry locally. When considering vessel in its motion, the force exerted by the propulsion system and the resistance that opposes it, would determine the speed a vessel could attain. The propulsion power is opposed by various kinds of resistance, or drag. Form drag results when the hull travels through the water, with its shape and frontal area relative to its direction of motion determining its total resistance. Hull beam at the chines and hull depth, as well as drag from appendages such as struts and rudders, create form drag. In order to plane (move on the water surface) a hull at higher speed, hull size, hull shape , design displacement, and the trim, or running angle are important parameters.Such a planing hull has to climb over its own bow wave. This needs a great deal of power because of variation of angle of attack of the hull relative to the water surface. When the vessel on plane, efficiency increases as the hull rises and trims decreases, flattening the wake and reducing form drag. With less hull bottom in contact with the water,frictional drag also decreases. In order to arrives at such a design, the fundamental principles of planing hull designs are to be used. This project involves use of such theories and development of a high speed hull. The paper presents the work carried out by the author in related to the above investigation in the following stages. i. Designing the planing hullform using principles of Naval Architecture to optimise the performance with respect to speed, seakeeping and stability. ii. Development of the plug and mould for the construction the boat in fibre glass. iii. Speed trial and performance test to verify the estimated power and seakeeping of the constructed boat.