The hull weight is 



(0.53) (54,400) = 28,800 lb 

 and the buoyancy of each tank is equal to 



54,400 - 28,800 

 2,000 



12.8 tons 



Frame, personnel capsule, and lifting gear as used in the two previous 

 designs is assumed compatible with the present design. Since the lift tanks 

 are larger in diameter than the ballast tanks used for the hydrazine vehicle or 

 the high-pressure helium vehicle, they will create additional drag which must 

 be accounted for by redesign of the propulsion and power systems. The 

 increase in cross-sectional area is equal to the cross-sectional area of the rigid 

 steel tanks minus the cross-sectional area of the hydrazine vehicle debal lasting 

 tanks 



(2IM(25.0)_(2II.M16.0) , ,^^2,^, ,^^,^,^^^, 



The new total cross-sectional area becomes 



73+14 = 87 ft^ 

 and proceeding as before 



D = 



f. ( 0.30) (25.0) (64.0) (87.0) 



° = msTj) = 6^^'^ 



147 



