Hydrofoiling boats represent the cutting-edge of the world of sailing. Their ability of “flying over the water” makes them one of the most fascinating challenges for designers. The increasing complexity results in the need to fnd trade-offs across the multiple specialist areas involved, in order to achieve a successful project. Hence the importance in the development of design tools capable of “foreseeing the future”. This thesis work aims to contribute to all design stages, from the preliminary to the more detailed, of an International Moth. At frst, the high-level requirements are identifed, imposed by the sailor’s needs, manufacturing’s limits and performance.