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  1. 100 YEARS OF BARROW-BUILT RN SUBMARINES, 1901-2001
  2. T CLASS, 1935-1970
  3.  
  4. MAIN PARTICULARS          Group 1                        Group 2
  5.  
  6. Length overall                            275 ft                                         273 ft 6 in
  7. Beam                                        26 ft 6 in                                     26 ft 6 in
  8. Depth, pressure hull                    14 ft 3 in                                    14 ft 3 in
  9. Displacement,
  10.   surface                                    1327 tons                                  1422 tons
  11.   submerged                               1575 tons                                  1571 tons 
  12. Diving depth                               300 feet                                    (i) 300 feet
  13. No. of shafts                              2                                              2
  14. Speed, surface:
  15.   design                                      15.25 knots                               15.25 knots 
  16.   service                                     15.25 knots                               15.25 knots 
  17. Speed, submerged:
  18.   design                                      9 knots                                      9 knots 
  19.   service                                     8.75 knots                                 8.75 knots 
  20. Endurance, surface:
  21.   design                                      7500 miles at 15.25 knots            7500 miles at 15.25 knots 
  22.   service                                     8000 miles at 10 knots                (ii) 8000 miles at 10 knots
  23. Endurance, submerged:
  24.   design                                      80 miles at 4 knots                      80 miles at 4 knots 
  25.   service                                     80 miles at 4 knots                     80 miles at 4 knots 
  26. Armament                                   (iii) 8 21-inch bow tubes               8 21-inch bow tubes 
  27.                                                  (2 external)                                 (2 external)
  28.                                                   2 21-inch amdiship tubes             2 21-inch amidship tubes 
  29.                                                  (16 torpedoes carried)                  1 21-inch stern tube
  30.                                                   1 4-inch gun                              (17 torpedoes carried)
  31.                                                  (iv) 3 0.303-inch machine-guns      1 4-inch gun
  32.                                                                                                   1 20mm Oerlikon cannon
  33.                                                                                                   3 0.303-inch machine-guns
  34. Complement:
  35.   design                                       56                                             61
  36.  
  37. (i) This was increased to 350 feet in the all-welded boats.
  38. (ii) T Class submarines serving in the Far East were modified to carry extra fuel, which increased endurance to 11 000 miles at 10 knots.
  39. (iii) As an alternative load, Group 1 submarines could carry 18 mines.
  40. (iv) These were later replaced by, or supplemented by, one 20mm Oerlikon cannon.
  41.  
  42. ┬⌐ BAE SYSTEMS 2001