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  1. MAIN PARTICULARS        V Class                        Nautilus                    G Class
  2.  
  3. Length overall                 147 ft 6 in                    258 ft 4 1/2 in                187 ft 1 in
  4. Beam                        12 ft 9 in                    20 ft 6 in                    15 ft 4 in 
  5. Depth, pressure hull            13 ft 4 in                    22ft 6 1/2 in                    16 ft 7 in
  6. Displacement,
  7.     surface                     391 tons                    1441 tons                    703 tons
  8.     submerged                457 tons                    2026 tons                    837 tons
  9. Diving depth                150 ft                        200 ft                        200 ft
  10. No. of shafts                    2                            2                            2
  11. Propellers                    3 blades,                    3 blades,                    3 blades,
  12.                             4ft 6 in diameter                6 ft 3 in. diameter            5 ft 8 in diameter
  13. Speed, surface:
  14.     design                    13 knots                     17 knots                    15.5 knots
  15.     service                    14 knots                                                14 knots
  16. Speed, submerged:
  17.     design                    8.5 knots                    10 knots                    9.5 to 10 knots
  18.     service                    9 knots                        9 knots                        9 knots
  19. Endurance, surface:
  20.     design                    *1200 miles (full power)        5300 miles at 11 knots        2600 miles (12.5 knots)
  21.     service                    *1130 miles (full power)        4400 miles at max 5 knots        1650 miles (full power)
  22. Endurance, submerged:
  23.     design                    74 miles (5 knots)            72 miles max                99 miles (3 knots)
  24.     service                    50 miles (5 knots)                                        95 miles (3 knots)
  25. Armament                    2 18-inch bow tubes             2 18-inch bow tubes             2 18-inch bow tubes
  26.                             (4 torpedoes carried)            4 18-inch beam tubes            2 18-inch beam tubes
  27.                                                         2 18-inch stern tubes             1 21-inch stern tube
  28.                             1 12-pounder gun            (16 torpedoes carried)            (10 torpedoes carried)
  29.                                                         
  30.                                                         1 3-inch HA gun                1 3-inch QF HA gun
  31.                                                                                     1 2-pounder gun
  32. Complement:
  33.     design                    20                            42                            30
  34.  
  35. *These figures are accepted for V2 to V4, but V1 carried 6% more fuel and the endurance figures should be increased proportionately.