1/2 in. 



h^'"-H 1-7/8 in. 



1/2 In. - 





rib spacing 18 in. HTS 

 (a) 600-foot depth. 



R = 5 ft in. 



1-1/8 in. 



U — 4in.— »| 





1/2in.-» 



£ 



1-5/8 in. 



.^rib 6-1/2 in. 



rib spacing 12 In. HY 130 

 (b) 6,000-foot deptli. 



i 



R = 5 ft in. 



Figure A-3. Typical pressure hull designs. 



97 



