A statistical power prediction method

This paper presents revised formulae for statistical power prediction based on a greater number of results than the original equations reported in a previous paper which comprised a numerical representation of resistance properties and propulsion factors that could be used for statistical ship performance prediction. Following over a year of experience, several fields for improvement of the derived prediction methods given before are indicated, namely: The formula for wavemaking resistance does not include the influence of the bulbous bow. The resistance of ships with large bulbous bows is overestimated by the original formula. The wavemaking resistance of ships with a large waterplane-area coefficient is overestimated by the previous formula. The accuracy of the formula for the thrust-deduction fraction for a slender single-screw ship appeared to be insufficient. The wake fraction and the model/ship correlation were not properly represented by the formula for full ships at ballast draught. Order from BSRA as No. 49,917.