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HMS A7
HMS ''A7'' was an submarine built for the Royal Navy in the first decade of the 20th century.
==Design and description==
''A7'' was a member of the first British class of submarines, although slightly larger, faster and more heavily armed than the lead ship, . The submarine had a length of overall, a beam of and a mean draft of . They displaced on the surface and submerged. The A-class submarines had a crew of 2 officers and 11 ratings.〔Gardiner & Gray, p. 86〕
For surface running, the boats were powered by a single 16-cylinder Wolseley petrol engine that drove one propeller shaft. When submerged the propeller was driven by a electric motor. They could reach on the surface and underwater.〔 On the surface, ''A7'' had a range of at ; submerged the boat had a range of at .〔Akermann, p. 120〕
The boats were armed with two 18-inch (45 cm) torpedo tubes in the bow. They could carry a pair of reload torpedoes, but generally did not as doing so that they had to compensate for their weight by an equivalent weight of fuel.〔Harrison, Chapter 27〕
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