Analytical method for determininig the power of the catamaran power plant
The article proposes a method for determining the power of the main engines of catamarans for the initial stages of design. The study examined round-bilge type seagoing boats. The proposed method is based on the graphs of Alfer'ev M.Ya., Madorsky G.S. for determining towing power for round-bilge type boats with supercritical speeds. These graphs are approximated by second-order polynomials. Estimates of the accuracy of approximation are obtained. For the scheme for calculating the propulsive coefficient, information about the designed boat may not be sufficient. Therefore, to determine the propulsive coefficient, statistics on seagoing boats with hydrojet propulsion was used. The volume of the studied sample group allows obtaining empirical formulas with the required reliability and accuracy. The basis of the formulas obtained is a two-parameter quadratic approximation. It is supposed to use the proposed method in the mathematical model for designing catamarans of the indicated types. In its turn, this model of designing boats will be the basis for optimizing their basic design characteristics.