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HMS Rattler (1843)
HMS ''Rattler'' was a 9-gun wooden sloop of the Royal Navy and the first British warship to adopt a screw propeller powered by a steam engine. She was arguably the first such warship in the world—the sloop USS ''Princeton'' was launched after the ''Rattler'', but was placed in commission much sooner.
==Background==
Screw propulsion had some obvious potential advantages for warships over paddle propulsion. Firstly, paddlewheels were exposed to enemy fire in combat, whereas a propeller and its machinery were tucked away safely well below deck. Secondly, the space taken up by paddlewheels restricted the number of guns a warship could carry, thus reducing its broadside. These potential advantages were well understood by the British Admiralty, but it was not convinced that the propeller was an effective propulsion system. It was only in 1840, when the world's first propeller-driven steamship, , successfully completed a series of trials against fast paddle-wheelers, that the Navy decided to conduct further tests of the technology. For this purpose, the Navy built ''Rattler''.
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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