In this thesis static stability of a sailboat is presented with focus on rotation about its longitudinal axis. For an explanation of basic concepts which are connected to buoyancy and static stability of the boat, the boat’s hull is simplified to the extent which allows for description of all parameters with simple mathematical expressions. In the theoretical part basic terms which are important for the description of a floating body are intoduced and the curve of static stability of the vessel is explained, which represents the central part of the thesis. A computer program Geogebra is used for analytical determination of the position of the water line for different angles of inclination and the total potential energy of the system is introduced. Further, static stability is discussed in terms of three variables – ballast, cross-sectional shape of the hull and the width of the hull.
In the practical part of this thesis the impact of all previously introduced variables (ballast, width and shape) is analyzed with the help of three simplified models of hulls. For each case, the curve of static stability is plotted. Data, obtained at measurements is linked to the theoretical results, presented in the first part of the thesis. Experimental method used for determining the balancing torque without determining the center of buoyancy is also explained in this part.
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