SERIES 60 C2 

















Br/A CONTOURS 

 WITHOUT LCB CORRECTION 

















































1 



































1 













1 













/ 























/ 























I 



/ 























L 























^ 



/ 























r 





















A 



/ 





















^ 



y 

















A^ 



^ 



^ 









































15000 

 1*000 



13000 



12000 



11000 



10000 



9000 



8000 



7000 



6000 



5000 



4000 



3000 



2000 

 1000 



8 



U 12 13 14 15 L6 17 18 19 



20 



SPEED IN KNOTS 



Figure 87 — Comparison of EHP obtained by testing a Model having 

 Series 60 Lines and Proportions of C.2. Class with Corresponding 

 Estimate from Series 60 Contours 



case, one for a ship having the LCB in the position used in the Series 60 models on which 

 the contours are based, the other for a ship having the LCB in the same position as the 

 actual ship in question. The change in ehp for the shift in LCB was estimated from the 

 data in Chapter VII and Tables 49 to 53. 



For the SCHUYLER OTIS BLAND and PENNSYLVANIA, the actual LCB positions 

 were within 0.5 percent LBP of those used in the Series 60 models from which the contours 

 were developed, and the effects on ehp were extremely small (Figures 86 and 88). In the 

 case of the C.2. design, the actual ship had the LCB 1.4 percent forward of midships, and 

 the position corresponding to the Series 60 contours was 1 percent aft. The actual and 

 estimated ehp did not differ materially below 15 knots, but above this speed, the estimated 

 ehp from the Series 60 contours was lower than that of the C.2. Series 60 equivalent, the 

 reduction at 18 knots being some 12 percent (Figure 87). This illustrates the advantage of 

 the finer entrance at these higher speeds. The estimated curve for the Series 60 equivalent 

 with the LCB in the actual ship position (1.4 percent forward), corrected by the data in 



XII-6 



