

— 



^^ SUSTAINED SEA 

 TRIAL SPEED V 



= 1.06 V, 



.89-I.6CP 







• PARENTS FOR SEOUETRICAL VARIATIONS 

 FULL CURVES SHOW OPTIMUM LOCATION 

 OF LCB FOR SERIES 60 







DOTTED CURVES SHOW LIMITS OF 

 MOVEMENT FOR LCB WITHIN WHICH (E) 

 DOES NOT INCREASE MORE THAN 1% 

 FROM MINIMUM VALUE. 























f1 





I' 















N 



















V 



W 



V/ 



I 



1- SUS 



TAINED 



SEA S 



■EED 





V 



\^ 



A/ 

















\ 



^ 



4^ 



^ 



s. 













\ 



^ 







t^ 













> 



^ 



w 



] 







TRIAL 



SPEED 



^ 





L 



w 



/ 

 / 







































; 



4.0 3.0 2.0 1.0 (8 1.0 2.0 JO 4.0 



* LC8 FROM Hi AS % LBP ^ 



Figure 32 — Permissible Variation in LCB 



Location for 1 Percent Variation 



in Resistance 



Figure 33 — Recommended Locations of LCB 



number of unrelated models in which many factors are varying in addition to LCB position. 

 In contrast, the results from Series 60 have the merits that the models are all related one to 

 the other in an orderly and quite definite way, the forms represent good, modern, single-screw 

 designs, and all the results were obtained in the same basin, employing the same instruments 

 and techniques and method of turbulence stimulation, and thus fonn a homogeneous set of 

 data. 



In general, comparison between the optimum LCB locations derived from Series 60 

 experiments and those suggested by other sources shows that although conforming in general 

 shape to the older lines, the Series 60 results indicate an optimum location somewhat further 

 aft. 



The comparisons given here have been made at certain speeds chosen to give economic 

 performance of the different forms. The criterion has been that the sustained sea speed 



VI-16 



