TABLE 40 



Comparison of Series 60 Propulsion Results with Actual Ships 



Model 



4468-3 



4057 



4484-1 



4133-2 



Representing 



Series 60 



Equivalent of 



PENNSYLVANIA 



PENNSYLVANIA 

 as Built 



Series 60 



Equivalent of 



SCHUYLER OTIS BLAND 



SCHUYLER 



OTIS BLAND 



as Built 



V, knots 



shp 



ehp/shp 



15.37 

 9200 

 0.739 

 1.231 

 0.603 

 0.995 



15.37 

 8850 

 0.750 

 1.199 

 0.616 

 1.016 



18.20 

 8750 

 0.784 

 1.092 

 0.690 

 1.040 



18.20 

 8900 

 0.760 

 1.076 

 0.696 

 1.015 



26 



20 





















I 



> 





\ 





i 





I 













y 



A 



STANDARD PROPELLERS, 

 D=0.7H ^^' 



-"•' 



r 









^< 



^" 



^ 



























1 



i 



i 











































^ 















^ 





28 



ships, and the model propellers used were made 

 to the designs fitted to the ships. The results 

 given in Table 40 show that the performance of 

 the Series 60 designs was very comparable with' 

 that of the two ships 



The designer can find the wake and 

 thrust deduction fractions for any ship within 

 the limits of the series and fitted with the 

 standard diameter of propeller from the contours 

 in Appendix B. The results given in this 

 chapter will enable him to make estimates of 

 the probable change in these and other factors 

 when it is necessary or desirable to use larger 

 or smaller propellers, and also for conditions 

 of lighter displacement with or without trim. 

 It is not intended here to attempt to 

 draw any overall conclusions regarding the variation of the propulsive factors. The data 

 given can be applied to individual designs or used by the naval architect for his own research 

 purposes to set up his own methods of estimating such coefficients for future use. Much addi- 

 tional information is included in Reference 61 for those who wish to study this part of the 

 work in more detail. 



0.60 0.65 0.70 0.75 0.80 



Cb 



Figure 56 — Variation of Diameter with Co 



X-18 



