The project continues along the lines drawn out with the range of Vismara 40 IMS racer-cruisers: a philosophy that seeks the maximum competitiveness for racing and exploitation of IMS regulations, on craft with a sporting-cruising future. The project therefore followed two lines of development, almost as if dealing with two separate boats: hydrodynamic research and optimised rating parameters, as for a pure racer and the integration of structures/ furnishings to be able to create a roomy, comfortable interior without any adverse effect on weight. The hull lines are the state-of-theart for IMS 2004 regulations, with high rakes on the water, deep U sections, vertical sides and buttocks with very tight diagonals. The classical setup for the current IMS is completed by: the sail plan with low overlap jib, a very large mainsail, high extending appendages without end bulb and a high concentration of weights with the ballast sunken in the bilge. The ICAD consortium’s contribution, using the powerful Computational Fluid Dynamics (CFD) software available, has allowed us to improve hull line analysis, considering the “free surface” effect which is not taken into account by either VPP or IMS software. The appendages too have been logically studied using CFD to develop aerofoils that, to win this rating, have a greater wetted surface but which, create less resistance to forward movement, thanks to laminar flow. The necessary integration of structure and fittings, plus the desire to create an elegant style both on deck and for the interiors, are based on the brand new Vismara 45’ Open “Margherita“.