High Quality Content by WIKIPEDIA articles! Three Janus class destroyers served with the Royal Navy. HMS Janus, HMS Lightning and HMS Porcupine were launched by Palmer's shipyard. They displaced 275 tons, were 200 feet long and produced 3,900 hp from their Reed boilers which gave them a top speed of 27 knots. The Royal Navy of the United Kingdom is the oldest of HM Armed Forces (and is therefore known as the Senior Service). From the beginning of the 18th century until well into the 20th century it was the most powerful navy in the world, playing a key part in establishing the British Empire as the dominant world power from 1815 until the early 1940s.

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