British Royal Navy`s F class submarine   In 1913 the Admiralty decided to produce a standard double hull costal type submarine-the F class was designed.   Specifications, HMS F-1, F class: Keel laid down by Chatham Royal Dockyard; launched May 31, 1915   Displacement (srf/sub tons): 363/525             Dimensions (L*B*D feet): 150`10*16`1*10`6 Propulsion: 2*450hp 6-cylinder Vickers diesel engine, 2*200hp electric motors for submergence driving two shafts Speed (srf/sub knots): 14/8.75 Range (srf/sub n/miles@knots): 3,000@9.5/36@4 Diving depth (feet): 100 Complement: 2 officers 17 enlisted Torpedo: 2*18" bow torpedo tube, 1*18" stern torpedo tube, containing a total of 6 torpedoes Mines: none Armament: 1*12pdr main deck gun added later   Construction Only 3 units constructed, F-1 to F-3, each by a different shipyard during 1915-17. Back to History Index Image Country Year Description Liberia 2001 F-2,built August 14,1915 at H.M.Dockyard