This thesis investigates the optimization of wingsail trim of yachts, aiming to reduce fuel consumption and travel time while maintaining a limited heeling angle. Utilizing the Sequential Least Squares Quadratic Programming (SLSQP) optimizer. The study addresses key research questions concerning the aerodynamic characteristics of wingsails, the effectiveness of reverse camber, ideal angles of attack and flap setting for various sailing conditions. The research demonstrates that optimized wingsail configurations can lead to significant fuel savings, particularly when combined with slow steaming techniques, achieving reductions of up to 26\% on specific routes. Detailed analysis of aerodynamic characteristics revealed the importance of precise control over sail settings to maximize performance. The desired lift and drag is dependent on each individually different quasi-static load case. However the main trend sailing upwind is that the optimizer aims to minimize drag and maximize lift. The main trend sailing down wind is that the optimizer aims to maximize drag and maximize lift. This research contributes to the advancement of sustainable maritime technologies. Offering incentive to continue with the industries shift towards more environmentally responsible practices, enhancing both economic and environmental outcomes in the luxury yacht sector.