SPECIFICATIONS

Overall Length x Maximum Breadth:    310 ft. 6 in.  x  27 ft. 1 in.
Displacement:  1,460 tons Surfaced;  2,350 tons Submerged.
Operating Depth:  250 feet.
Watertight Compartments:  7 plus conning tower.
Pressure Hull Plating:  approx. 11/16 in. mild steel.
Torpedo Tubes:  4 bow; 4 stern.
Torpedo Load, Max:  20 internal, 4 external (later removed)
Deck Guns:  1 3-in./50-cal.
Maximum Speed:  20 knots surfaced;  8.75 knots submerged.
Cruising Range:  11,000 miles surfaced at 10 knots.
Submerged Endurance:  48 hours at 2 knots.
Fuel Capacity:  109,000 gallons.
Patrol Endurance:  75 days.
Propulsion:  Composite with 2 main propulsion engines, 2 main generator
             engines, 2 aux. generator engines.
             4 main motors with 2,740 shaft horse power.
             2 126-cell main storage batteries.


CONSTRUCTION:

Number of boats:  6 boats ordered in 1937.
Builders:  Electric Boat (SS 188-190); Portsmouth (SS 191,192)
           Mare Island (SS 193)







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