AN ANALYSIS OF RESIDUARY DRAG

By a re-definition of the standard coefficients of form, wherein displacement is weighted by its distribution in depth, the analysis of wave making resistance is simplified. Using the Taylor Standard Series as a data base, regression analyses are employed to develop a universal wave drag function of only one variable for each speed length ratio. Form drag is decomposed into components which facilitate analysis. Prediction formulae are developed graphically from the Taylor Standard Series data. Using the prediction formulae developed, wave drag and form drag are predicted for a number of sample ships and are compared to that predicted by Gertler's reanalysis of the Taylor Standard Series. Similar comparisons are made for a half dozen models which are unlike the Taylor Standard Series parent with their individual towing tank test results. Dif-ferences and possible sources of error are discussed