f. Lifting gear - 2,000 lb 



g. Batteries and Propulsion System — 5,000 lb 



Total - 13,863 lb 



Thus, permanent buoyancy equivalent to 1 3, 863 lb is needed. This will be 

 provided by 578 ft^ of syntactic foam. 



Dry Weight of Vehicle Subsystems 



a. Personnel Capsule 5,420 lb 



b. Gas Generator 2,000 1b 



c. Hydrazine Fuel 5,240 lb 



d. Ballast Tanks 3,283 lb 



e. Frame 4,000 lb 



f. Lifting Gear 2,000 lb 



g. Batteries and Propulsion System 5,000 1b 

 h. Foam 23,100 1b 



Total 50,043 lb 



Vehicle With Rigid Cylindrical Lift Tanks 



This vehicle would employ two ring-stiffened, cylindrical pressure 

 vessels for a 20-ton lift capacity at 6,000 feet. The pressure vessels will be 

 constructed out of H Y-1 50 steel. For ring-stiffened cylinders with this yield 

 strength, it has been found that the hull weight is approximately equal to 

 53% of the submerged displacement. Therefore, for a diameter of 5.0 feet and 

 a length of 45 feet, the displacement of each cylindrical tank is 



146 



