Design of Low-Resistance Hull Fornns 

 UNIFORM SOURCE DISTRIBUTION ON CENTRAL PLANE S=0-6V 



3^ 



Fig. 4 - Unifornn source distribution head form 



a well-behaved boundary layer. Also, at each depth within the source- 

 distribution rectangle the integral of the source density was the same as for the 

 uniform source -density model, thus ensuring that the afterbody was of roughly 

 the same shape for the two models. Within these imposed limitations the form 

 chosen for the source density in Fig. 5 was arrived at by a cut-and-try proce- 

 dure to give a resistance which, if not necessarily the lowest possible, was at 

 least substantially below that for the uniform density model, as can be seen 

 from Fig. 6. On Pien's arrangement, therefore, experimental results for the 

 quasi -bulbous model should agree closer with theory than those for the uniform 

 source -density model. 



SOURCE DISTRIBUTION ON CENTRAL PLANE S-0-6V I-0092 cos 2n X -0742 coaTTZ cq» iTJ X 



\ I L D L 



t»A L H 



ES- 



■r.i 



I 2 3 4 5 6 , 7 



7 7 321 



Fig. 5 - Quasi-bulbous head form 



717 



