Aerodynamic study of a recreational vessel designed for navigation in the Danube Delta

The paper presents a study on the aerodynamic influence of wind on the hull of a sailing vessel, analysed both without sails and in full sail configuration, at different wind speeds and angles of incidence, in order to determine its aerodynamic torsor. The methodology included 3D modelling of the hull using Rhinoceros software, creating the lines plan, and building the physical model through printing and assembly. The resistance to forward motion was estimated using the Delft Series method, through tabular calculations in Excel and specialized software such as MaxSurf Resistance. The aerodynamic study itself was conducted in the naval wind tunnel, after calibrating the six-component balance and verifying the velocity distribution, with tests performed for the vessel both with and without sails, at various wind speeds and angles.