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  1. 100 YEARS OF BARROW-BUILT RN SUBMARINES, 1901-2001
  2. A, B AND C CLASSES, 1902-1910
  3.  
  4. MAIN PARTICULARS          A CLASS                    B CLASS              C CLASS
  5.  
  6. Length Overall                            105 ft 1/2 in                       142 ft 2 1/2 in            142 ft 2 1/2 in
  7. Beam                                         12 ft 8 3/4 in                     13 ft 7 in                   13 ft 7 in
  8. Depth, pressure hull                     12 ft 8 3/4 in                     13 ft 7 in                   13 ft 7 in
  9. Displacement,
  10.   surface                                    190 tons                            287 tons                   290 tons
  11.   submerged                                205.5 tons                         316 tons                   320 tons
  12. Diving Depth                              100 ft                                100 ft                       100 ft
  13. No. of shafts                              1                                      1                              1
  14. Propeller                                     1, 3 blades,                        1, 3 blades,               1, 3 blades,
  15.                                                  4 ft 4 in diameter                5 ft diameter              5 ft 7 in diameter
  16. Speed, surface:
  17.   design                                     11.5 knots                          13 to 13.5 knots         13 knots 
  18.   service                                    11 + knots                          12 knots                    13 + knots 
  19. Speed, submerged:
  20.   design                                      7 knots                              7 knots                      7.5 + knots
  21.   service                                     6 knots                              6.5 knots                   8 knots
  22. Endurance, surface:
  23.   design                                      600 miles                           1300 miles                 1300 miles 
  24.                                                  at full power                        at 9 knots                  at 9 knots 
  25.   service                                    325 miles                            740 miles                   910 miles 
  26.   (at full power)
  27. Endurance, submerged:
  28.   service                                    20 miles                              22.5 miles                 16 miles 
  29.                                                  at 6 knots                           at 6.5 knots               at 8 knots 
  30. Armament                                  2 18-inch bow                       2 18-inch bow             2 18-inch bow
  31.                                                  torpedo tubes                       torpedo tubes            torpedo tubes 
  32.                                                  (4 torpedoes                        (4 torpedoes              (4 torpedoes 
  33.                                                  carried)                               carried)                     carried)
  34. Complement                               11                                      15                            16
  35.  
  36. 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.
  37.  
  38. ┬⌐ BAE SYSTEMS 2001