An extremely schematic model of the forces acting an a sailing yacht equipped with a system of foils is here presented and discussed. The role of the foils is to raise the hull from the water in order to reduce the total resistance and then increase the speed. Some CFD simulations are providing the total resistance of the bare hull at some values of speed and displacement, as well as the characteristics (drag and lift coefficients) of the 2D foil sections used for the appendages. A parametric study has been performed for the characterization of a foil of finite dimensions. The equilibrium of the vertical forces and longitudinal moments, as well as a reduced displacement, is obtained by controlling the pitch angle of the foils. The value of the total resistance of the yacht with foils is then compared with the case without foils, evidencing the speed regime where an advantage is obtained, if any.

翻译：本文提出并讨论了一种用于分析配备水翼系统的帆船所受作用力的高度简化模型。水翼的作用是将船体抬离水面，以降低总阻力从而提高航速。通过部分计算流体动力学（CFD）模拟，获得了裸船体在特定航速和排水量下的总阻力，以及用于附体的二维翼型剖面特性（阻力和升力系数）。通过参数化研究对有限尺寸水翼进行了特性表征。通过控制水翼的俯仰角，实现了垂直力与纵向力矩的平衡以及排水量的减小。研究进一步对比了配备水翼与未配备水翼状态下帆船的总阻力值，明确了在何种航速区间内水翼系统能带来优势（若存在优势）。