G-class Submarine (other)
G-class submarine may refer to: * British G-class submarine * Spanish G-class submarine, locally produced German Type VIIC-class submarines, see Spanish submarine G-7 * United States G-class submarine The G-class submarines were a class of four United States Navy submarines. While the four G boats were nominally all of a class, they differed enough in significant details that they are sometimes considered to be four unique boats, each in a clas ...

British G-class Submarine
The Royal Navy's G class of diesel/electric submarines were launched between 1914 and 1917, and intended for operations in the North Sea and German Bight in World War I against German U-boats. Description The G-class submarines were designed by the Admiralty in response to a rumour that the Germans were building double-hulled submarines for overseas duties. The submarines had a partial double hull, a length of overall, a beam of and a mean draft of . They displaced on the surface and submerged. However, the design offered little improvement in practice, the ships being notoriously slow to dive.Arthur, M. (1997). ''Lost voices of the Royal Navy'',  p.84. Hodder & Stoughton Ltd, London. Most of the class had their bows raised during the war to increase buoyancy and improve seakeeping. For surface running, the boats were nearly all powered by two Vickers two-stroke eight-cylinder diesel engines, each driving one propeller shaft. These engines were the first in the worl ...
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Spanish Submarine G-7
German submarine ''U-573'' was a Type VIIC U-boat built for Nazi Germany's ''Kriegsmarine'' for service during World War II. Her keel was laid down 8 June 1940 at the Blohm & Voss yard in Hamburg as yard number 549. She was launched on 17 April 1941 and commissioned on 5 June with ''Kapitänleutnant'' Heinrich Heinsohn (12 February 1910 – 6 May 1943) in command. Heinsohn commanded her for her entire career in the Kriegsmarine. In May 1941 he had arranged that the city of Landeck in Tyrol adopted the submarine within the then popular sponsorship programme (Patenschaftsprogramm), organising gifts and holidays for the crew, earning her the honorary name "U-573 ''Landeck''". The boat began her service career as part of the 3rd U-boat Flotilla when she conducted training; on 1 September 1941 she commenced operations with that flotilla. She was transferred to the 29th Flotilla, also for operations, on 1 January 1942. She was sold to the Spanish Navy that same year and became ...
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