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HMS Waterwitch (1866) : ウィキペディア英語版 | HMS Waterwitch (1866)
HMS ''Waterwitch'' was one of only three armoured gunboats built for the Royal Navy. Uniquely she was powered by Ruthven's "hydraulic propeller", making her the first ship to employ waterjets. She was launched in 1866 and conducted comparative trials with her two sister ships. She was not employed operationally and was sold in 1890. ==Design== Designed by the Rear Admiral George Eliot and the Controller's Department,〔 ''Waterwitch'' was a half-sister to and , and all three were built mostly as experimental vessels. While ''Viper'' and ''Vixen'' were twin screw vessels, ''Waterwitch'' had a water-pump propulsion system. ''Vixen'' was almost identical to ''Viper'', but was of composite construction.〔
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