engleski

Resistance prediction of semiplaning transom stern hulls

Reliable methods to predict resistance characteristics form the basic tool for the preliminary hydrodynamic design of semiplaning hulls. The total resistance is calculated for five models of semiplaning ships series „Sklad“ with transom stern developed at the Brodarski Institute in Zagreb. The Lahtiharju and Mercier-Savitsky methods for the total resistance prediction of semiplaning hulls were used. Both methods were developed by using regression analysis which was based on the total resistance data for the transom stern hull forms. The total resistance calculated with both methods is compared with measured total resistance for wide range of the Froude number . Model tests were conducted in the towing tank B2 at the Brodarski Institute in Zagreb. Measured total resistance and total resistance obtained by the Lahtiharju method is compared for wider range of the Froude number than suggested by the author. It has been concluded that the Lahtiharju method is more reliable than the Mercier-Savitsky method which can give deviations up to 50%. Results pointed out the applicability of the Lahtiharju method for wider range of the Froude number than suggested.

resistance; semiplaning hull; transom stern

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