MAIN PARTICULARS

Length overall                    181 ft
Beam                                15 ft 1 1/2 in
Depth, pressure hull            15 ft 1 3/4 in
Displacement, 				
  surface                            667 tons
  submerged                       807 tons
Diving depth                       200 ft
No. of shafts                      2
Propellers                           3 blades, 5 ft 7 in diameter
Speed, surface			
  design                             15.25 knots
  service                            14 knots
Speed, submerged:		
  design                             10.25 knots
  service                            9.5 knots
Endurance, surface:
  design                             3000 miles at 10 knots
  service                           1500 miles (full power) or 3000 miles at 10 knots
Endurance, submerged:
  design                             99 miles at 3 knots
  service                           10 miles at 9 knots or 65 miles at 5 knots
Armament                          2 18-inch bow tubes 
                                        2 18-inch beam tubes 
                                        1 18-inch stern tube
                                        (10 torpedoes carried)

                                        1 12-pounder gun
Complement,
  design                             30