and 648/25.0 = 25.9 hp required. Two motors rated at 13 hp will be used. 

 Assuming 70% efficiency, the power requirement will be: 



26 hp X 0.746 kw/hp x 1.30 = 25.2 kw 



and for a 10-hour mission, 252 kw-hr of energy must be stored. The total 

 energy to be supplied by silver/zinc storage cells is 282 kw-hr which will 

 require about 282/0.06 = 4,700 lb of cells. 



Submerged Weight of Vehicle Subsystems 



a. Personnel Capsule -1-1,810 lb 



b. Lift Tanks +51,250 lb 



c. Frame -4,000 1b 



d. Lifting Gear -2,000 1b 



e. Batteries and Propulsion System — 6,500 lb 



Total -H 40,560 lb 



An expendable ballast weight, assumed here to be concrete, weighing 

 40,560 pounds (wet) will be needed to compensate for the excess buoyancy 

 created by the lift tanks. 



Dry Weight of Vehicle Subsystems 



a. Personnel Capsule 5,420 lb 



b. Lift Tanks 28,800 lb 



c. Frame 4,000 lb 



d. Lifting Gear 2,000 lb 



148 



