Italy is one of the leaders in construction of large yachts, this market became bigger in the last decades not only in terms of number of constructions but also in terms of ship sizes.

In '80s most Yachts were 30-40 m long, megayachts over 60 m were unusual, then the sizes of yachts increased to the actual 100 m and over. Same way the cruising speed raised from 12 to 20 knots and over.

This made necessary developing new types of hulls, able to operate at a Froude number (Fr) relatively high for a displacement hull, around 0.34-0.38, but with ratios L/B quite low for stability purposes.

The purpose of the research was to examine ten hulls of yachts, from 32 to 80 m, all tested at model basin and following built and make a statistical examination of the main geometrical data, and geometrical coefficients:

Position of LCB (longitudinal center of buoyancy) respect to the Length, Ratios Am/T*B (Midship section coefficient), CB (block coefficient) etc, in order to define a guidelines for the design of this type of hulls and to find, if possible, common aspects to consider.