2.0 A 2.2 2.4 



(k) b.65 Cb 0= 2,10 



Figure 31 - Minimum © Values and Optimum LCB Position 



A great deal has been written in the past upon the best location for LCB, but there 

 has been no unanimity among the recommendations in the literature. It is therefore of 

 interest to look at the results for Series 60 against this wider background. Comparisons 

 are shown in Figures 33 and 34. 



Dr. van Lammeren has given three curves based upon Netherland Ship Model Basin 

 (NSMB) experience showing the recommended mean position for the LCB and the limits 

 which should not be exceeded."*^ These curves are shown as A, B, and C in Figure 33. 



Professor Volker has summarized many of the results of previous tests, ^° and Bocler 

 gave a collection of data from very widespread sources in 1953.^^ Much of the information 

 shown in Figures 33 and 34 has been taken from these two papers. Hecksher's curve is 

 based upon extensive data compiled at the Hamburg Tank," Ayre's from an exhaustive 

 analysis of published data,^^ and Todd's from experience at the National Physical Labora- 

 tory (NPL) tanks at Teddington.^^ 



The positions and shapes of the recommended optimum lines vary considerably. This 

 no doubt reflects the differences in the sources fi-om which the data were drawn, the presence 

 or absence of turbulence stimulation in some of the model tests, the choice of the relation- 

 ship between fullness and speed and, to some extent, the personal interpretation of the data. 

 It must also be remembered that these suggested curves represent an average for a large 



VI-15 



