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  1. MAIN PARTICULARS    U Class (Group 1)       U Class (Group 2)      V Class
  2.  
  3. Length overall                     190 ft 7 in                          195ft 6 in                          203 ft 5 in
  4. Beam                                 15 ft 9 in                           15 ft 9 in                           15ft 9 in 
  5. Depth                                 15 ft 9 in                           15 ft 10 in                         15 ft 9 in 
  6. Displacement,
  7.   surface                       630 tons                            648 tons                           660 tons 
  8.   submerged                  730 tons                            735 tons                           740 tons 
  9. Diving depth                       200 feet                             200 feet                           300 feet
  10. No. of shafts                      2                                       2                                     2
  11. Speed, surface:
  12.   design                        11.5 knots                          11.5 knots                        12.5 knots 
  13. Speed, submerged:
  14.   design                         9 knots                              9 knots                            9 knots 
  15. Endurance, surface:
  16.   design                        4050 miles at 10 knots         4050 miles at 10 knots       4700 miles at 10 knots 
  17. Endurance, submerged:
  18.   design                        23 miles at 8 knots              23 miles at 8 knots            30 miles at 9 knots 
  19.                                         170 miles at 2.5 knots          170 miles at 2.5 knots 
  20. Armament                          (i)  4 21-inch bow tubes         4 21-inch bow tubes            4 21-inch bow tubes 
  21.                                         (8 torpedoes carried)             (8 torpedoes carried)           (8 torpedoes carried)
  22.                                         (ii) 1 3-inch gun                     1 3-inch gun                       1 3-inch gun
  23.                                         3 0.303-inch machine-guns     3 0.303-inch machine-guns   3 0.303-inch machine-guns
  24. Complement:
  25.   design                       33                                        33                                    37
  26.  
  27. (i) The first seven U Class submarines had two additional external bow tubes installed and carried 10 torpedoes.
  28. (ii) Undine and Unity, which were not fitted with the 3-inch gun, had 27-man complements.
  29.  
  30.