Method for determining maximum navigational speed based on sail attack angle of unmanned sailboat

The invention discloses a method for determining the maximum navigational speed based on a sail attack angle of an unmanned sailboat. The method comprises the following steps: building a sailboat model by taking the internal relation between a sail acting force coefficient and a sail attack angle as the basis, comprehensively considering the sail boosting force and side thrust, and combining target sailboat parameters; synthesizing rudder stress factors to establish a rudder stress model; and establishing a sailboat motion model by using a response type three-degree-of-freedom ship manipulation separation (MMG) method, so that conditions required by an unmanned sailboat to reach the maximum navigational speed under different relative wind direction angles are calculated. By means of the method, a strategy for the sail attack angle of the target sailboat at the maximum navigational speed is obtained, and a more reliable guarantee is provided for the unmanned sailboat to stably sail at the maximum navigational