This paper discusses the impact of scaling effects in performance a standalone wing sail, comparing experiments and numerical simulations. The experimental data sail with NACA0015 section, tested R.J. Mitchell wind tunnel at University Southampton, are compared tests run KTH Royal Institute Technology, where L2000 had smaller scale, Computational Fluid Dynamics simulations three different cases. For simulations, first model scale Southampton was simulated. Then, keeping same domain...

The NACRA 17 is a small foiling catamaran that lifted out of the water by two asymmetric z-foils and rudder elevators. This paper investigates how foil deflection affects not only performance but overall boat behaviour using numerical Fluid Structure Interaction (FSI) model. deformations are solved with solid model based on Finite Element Method (FEM) flow Reynolds Average Navier-Stokes (RANS) Volume Model (FVM). models strongly coupled to allow dynamic FSI simulations. validated comparing...

Hydrofoils are a current hot topic in the marine industry both high performance sailing and new passenger transport systems conjunction with electric propulsion. In community, largest impact is seen from America’s cup, where boats sailed at more than 50 knots (over 100 km/h) 100% “flying” time. also becoming popular Olympics, as 2024 Olympic games 5 gold medals will be decided on foiling boats/boards. The reason for increasing popularity of hydrofoils recent advances composite materials,...

Abstract. For a sailing yacht, depowering is set of strategies used to limit the sail force magnitude by intentionally moving away from point maximum forward driving force, potentially reducing ship speed. The reasons for doing this includes among others; reduction quasi-static heeling angle, structural integrity masts and sails crew comfort. wind powered cargo ship, time spent on route utmost importance. This leads question whether there performance difference between different if so, how...

The International Moth is an ultra-lightweight foiling dinghy class. Foil deflections and dynamic sailor-induced motions are identified as two key areas relating to moth performance that currently ignored in Velocity Prediction Programs (VPP). impact of foil assessed by measuring the tip deflection twist deformation a T-foil from Moth. full field due applied load measured using Digital Image Correlation (DIC). foil's structural properties can then be determined based on response....

_ Venue-specific training has, over the years, proven to be a key asset for sailing teams performing at major championships and Olympics. A comprehensive understanding of environmental features possible weather scenarios in an outdoor sport like can provide athletes with significant strategic advantage. At same time, GPS tracking is becoming readily available technology that use both during races analyse their own competitor's performance. This work couples meteorological data tracks Olympic...

_ Modern wind propulsion systems on ocean-going cargo vessels require automated trimming. Rigid wingsail designs often incorporate more than one degree of freedom enabling to trim for optimal performance in all sailing conditions. A profound understanding the aerodynamic behavior is basis any trimming strategy. The region around stall particular importance as this where largest lift but also potential hysteresis effects are expected. In present research, a two-element (main wing and flap)...

The effects of multiple wings interacting and the change in efficiency due to those as well optimal sheeting angles are becoming an important area study with advent wind-propelled ships for goods transport. This research presents a first analysis wind tunnel tests carried out at University Southampton R.J. Mitchell where three subject turbulent flow Reynolds number excess 1 million. A range possible variations ship heading apparent tested taking into consideration blockage geometrical...

The Tokyo 2020 Olympic Sailing Competitions were held in Enoshima Bay between the 25th of July and 4th August 2021. climatological strategical analysis race area for Swedish Team was developed three years prior to Olympics (Masino et al., 2021). result years’ research a tool named ”Call Book” that provides rules sailors coaches both terms expected ranges wind speed direction also trends with explanations each identified weather pattern. support team working not only on forecast but specific...

The recent America's Cup has demonstrated the extreme performance capability of AC45 and AC72 catamarans. high cost risk catastrophic failure imposed restrictions on availability these boats for training. As a consequence use simulators to allow shore-based training becomes an attractive option. aim this study is recently developed tacking simulator investigate optimum tack sequence by conducting parametric user control inputs based previously recorded time histories. will provide better...

Abstract Assessing the manoeuvring performances of a ship at design stage is becoming more important, especially when trying to improve shipping efficiency reduce fuel consumption. When designing hull with appendages, it necessary balance hydrodynamic manoeuvrability. Therefore, possibility simulating captive test will increase chances understanding behaviour from an early in process. The current research based on evaluation and appendages pure resistance, self-propulsion wind-assisted mode....

Match racing starts in sailing are strategically complex and of great importance for the outcome a race. With return America’s Cup to upwind World Racing Tour attracting young development sailors, tactical skills necessary master could be trained learned by means computer simulations assess large range approaches starting box. This project used game theory model start match race, intending develop study strategies using Monte-Carlo tree search estimate utility player’s potential moves...