SPHERE 

 (STAR I) 



BI-SPHERE 

 (DEEP QUEST) 



TRISPHERE 

 (DSRV) 



SPHERE CYLINDER 

 (BEAVER) 



CYLINDER 

 (ALUMINAUT) 



ELLIPSE 

 (SP-350) 



INVERTED 



WEDGE 

 (GOLDFISH) 



CYLINDER/CONE 

 (PC-14) 



Fig. 5.1 Basic pressure hull shapes. 



depth increases the cylinder must be 

 strengthened by frames and thereby weight 

 is added to the detriment of the W/D ratio. 

 An example of W/D ratio as related to shape 

 and sphericity (in this case SVs-inch devia- 

 tion from the nominal radius) in an 8-ft-diam- 



eter sphere is presented in Table 5.2. Table 

 5.3 lists the relative major advantages and 

 disadvantages of three basic configurations. 

 It is important to note that introduction of 

 lightweight materials into pressure hulls 

 permits greater operational depths while 



244 



