The Black Swan class and Modified Black Swan class were two classes of sloop of the Royal Navy and Royal Indian Navy. Twelve Black Swans were launched between 1939 and 1943, including four for the Royal Indian Navy; twenty-five Modified Black Swans were launched between 1942 and 1945, including two for the Royal Indian Navy; several other ships were cancelled.
HMS Black Swan in April 1945
In the 18th century and most of the 19th, a sloop-of-war in the Royal Navy was a warship with a single gun deck that carried up to eighteen guns. The rating system covered all vessels with 20 guns and above; thus, the term sloop-of-war encompassed all the unrated combat vessels, including the very small gun-brigs and cutters. In technical terms, even the more specialised bomb vessels and fireships were classed as sloops-of-war, and in practice these were employed in the sloop role when not carrying out their specialised functions.
The 1854 USS Constellation, a later United States Navy sloop-of-war named after the original frigate
1831 painting of a three-masted Bermuda sloop of the Royal Navy, entering a West Indies port.
USS Portsmouth in 1896.
The Grimsby-class HMS Wellington. Launched in 1934, the vessel is now berthed on the Thames