The number of models run had to be limited both on the score of time and expense. 

 In view of the wide field covered, the question may be asked as to how well the contours of 

 residuary resistance, (C), wake fraction, thrust deduction fraction, and relative rotative effi- 

 ciency represent the probable values of these quantities at points not directly supported by 

 test results-in other words, how reliable would be estimates made of these quantities from 

 the interpolated contours? One such comparison is given in Appendix C (see Figure C-3) 

 where it is shown that the particular set of contours chosen represents extremely well the 

 results of the nine models on which they were based. 



A more general method of answering this question is available, however. In the pro- 

 cess of assessing the merits of the Series 60 parents, actual models of Series 60 equivalents 

 of the SCHUYLER OTIS BLAND, C.2., and PENNSYLVANIA were made and tested. These 

 models had the corresponding dimensions, displacement, and LCB position of the actual 

 ship but Series 60' lines. It is now possible to estimate the ehp for these three forms from 

 the contours and to compare the results with the ehp actually measured on the models. Such 

 comparisons are shown in Figures 86, 87, and 88. Two estimated curves are shown in each 



SERIES 60 SCSTXLER OTIS BUND 



(MODEL 4484) 



ESTIUfcTE COMPUTED FHOM 



R./A CONTOURS 

 WITHOUT LCB CORRECTIOIt 



SPEED IN KNOTS 



Figure 86 - Comparison of EHP obtained by testing a Model having 



Series 60 Lines and Proportions of SCHUYLER OTIS BLAND 



with Corresponding Estimate from Series 60 Contours 



xn-5 



