High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! HMS Portland was a 50-gun fourth rate ship of the line of the Royal Navy, built at Limehouse according to the dimensions laid down in the 1741 proposals of the 1719 Establishment, and launched on 11 October 1744. Portland served until 1763, when she was sold out of the navy. In the British Royal Navy, a fourth rate was, during the first half of the 18th century, a ship of the line mounting from 46 up to 60 guns. While the number of guns stayed subsequently in the same range up until 1817, after 1756 the ships of 50 guns and below were considered too weak to stand in the line of battle, although the remaining 60-gun ships were still classed as fit to be ships of the line.

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