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HMS Spearhead (P263)
HMS ''Spearhead'' was a S-class submarine of the third batch built for the Royal Navy during World War II. She survived the war and was sold to Portugal.
==Design and description==
The last 17 boats of the third batch were significantly modified from the earlier boats. They had a stronger hull, carried more fuel and their armament was revised. The submarines had a length of overall, a beam of and a draft of . They displaced on the surface and submerged.〔Chesneau, p. 52〕 The S-class submarines had a crew of 48 officers and ratings. They had a diving depth of .〔McCartney, p. 7〕
For surface running, the boats were powered by two diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor.〔Bagnasco, p. 110〕 They could reach on the surface and underwater.〔 On the surface, the third batch boats had a range of at and at submerged.〔
''Spearhead'' was armed with six 21-inch torpedo tubes in the bow. She carried six reload torpedoes for a grand total of a dozen torpedoes. Twelve mines could be carried in lieu of the torpedoes. The boat was also equipped with a 4-inch (102 mm) deck gun.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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