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  1. MAIN PARTICULARS          A CLASS                    B CLASS              C CLASS
  2.  
  3. Length Overall                            105 ft 1/2 in                       142 ft 2 1/2 in            142 ft 2 1/2 in
  4. Beam                                         12 ft 8 3/4 in                     13 ft 7 in                   13 ft 7 in
  5. Depth, pressure hull                     12 ft 8 3/4 in                     13 ft 7 in                   13 ft 7 in
  6. Displacement,
  7.   surface                                    190 tons                            287 tons                   290 tons
  8.   submerged                                205.5 tons                         316 tons                   320 tons
  9. Diving Depth                              100 ft                                100 ft                       100 ft
  10. No. of shafts                              1                                      1                              1
  11. Propeller                                     1, 3 blades,                        1, 3 blades,               1, 3 blades,
  12.                                                  4 ft 4 in diameter                5 ft diameter              5 ft 7 in diameter
  13. Speed, surface:
  14.   design                                     11.5 knots                          13 to 13.5 knots         13 knots 
  15.   service                                    11 + knots                          12 knots                    13 + knots 
  16. Speed, submerged:
  17.   design                                      7 knots                              7 knots                      7.5 + knots
  18.   service                                     6 knots                              6.5 knots                   8 knots
  19. Endurance, surface:
  20.   design                                      600 miles                           1300 miles                 1300 miles 
  21.                                                  at full power                        at 9 knots                  at 9 knots 
  22.   service                                    325 miles                            740 miles                   910 miles 
  23.   (at full power)
  24. Endurance, submerged:
  25.   service                                    20 miles                              22.5 miles                 16 miles 
  26.                                                  at 6 knots                           at 6.5 knots               at 8 knots 
  27. Armament                                  2 18-inch bow                       2 18-inch bow             2 18-inch bow
  28.                                                  torpedo tubes                       torpedo tubes            torpedo tubes 
  29.                                                  (4 torpedoes                        (4 torpedoes              (4 torpedoes 
  30.                                                  carried)                               carried)                     carried)
  31. Complement                               11                                      15                            16
  32.  
  33. Pre-First World War British submarines also carried three white mice, which were entered on the pay-roll as part of the crew.  Being extremely sensitive they notified the slightest escape of petrol fumes - by squeaking excitedly.
  34.  
  35.