The body comprises whole sections which are ellipses running transversely through it and with their small and large half axes lying vertically or horizontally. The lengths of the ellipses change from maximum value to zero from the bow to the stern or from the stern to the bow over a half period in sinusoidal form so that the ideal shape of the body is exactly described by the mathematical equation: z<2>//B<2>cos<2>( pi x//2/L)+y<2>T<2>sin<2>( pi x//2L) Where, L is the length of the body, T is the draught of the bow and B is the half width of the stern.
