aluminum 7079-T6 pressure 

 spheres (bolted hemispheres) 



Bisphere j Quintsphere 1 



Trisphere > length to diameter = 4 to 1 Hexsphere I length to diameter = 5 to 1 



Quadsphere ) Heptsphere \ 



(a) Aluminum sphere. 



molded syntactic foam 



(b) Homogeneous material. 



Figure 21. Buoyancy support configurations. 



63 



