100 YEARS OF BARROW-BUILT RN SUBMARINES, 1901-2001
MINELAYING SUBMARINES, 1930-1946

MAIN PARTICULARS    Porpoise Class

Length overall              289 ft
Beam                          29 ft 10 1/4 in
Depth, pressure hull     16ft 9 in
Displacement,
  surface                    1768 tons
  submerged               2053 tons
Diving Depth              300 ft
No. of Shafts             2
Propellers                  Details unknown
Speed, surface:
  design                     15 knots
  service                    16 knots
Speed, submerged:
  design                      8.75 knots
  service                    8.9 knots
Endurance, surface:
  design                      12 800 miles (maximum) 
  service                     3860 miles (full power)
                                 11 500 miles at 8 knots
Endurance, submerged:
  design                      64 miles at 4 knots
  service                     8 miles at 9 knots
                                 66 miles at 6 knots
Armament                   6 21-inch bow tubes
                                (12 torpedoes carried)
                                 1 4-inch gun
                                 50 Mk XVI mines
Complement
  design                59

© BAE SYSTEMS 2001