The Wave-Making Resistance of High Speed Boats : (The Third Report) Comparison to Residual Resistance

Abstract

The preceding two reports deal with the optimization of high speed boat hull forms in regard to their wave-making resistace theoretically. These studies are founded on the presupposition that the linear theory may predict experimental results fairly well in high speed range. However, this presupposition has not been established on wide and general obserbations. The present report proposes the one of the basis of such presuppotion by comparing the residual resistance to the calculated wave-making resistance of the systematic series model tests Series 64 at David W. Taylor Model Basin. The results support well this presupposition in general but it seems that the residual resistance includes a component other than wave-making one at very high speed. The wave-making resistance at higher speed than the last hump is controled by the diverging wave components, so that shape of the transverse section may play a decisive role on the wave-making resistance. This is a different point at low speed case in which the transverse wave components play a decisive role and the sectional area curve determines nearly the wave-making resistance.