In 1948 surviving sloops and corvettes were redesignated as frigates. Fleet minesweepers such as the were rated as "minesweeping sloops". The 1840s saw the construction of experimental steam-powered frigates and sloops. It is used on single-masted sloops and twin-masted boats such as yawls and ketches. The Navy also acquired two British "Arabis"-class sloops, that were commissioned as cruisers. The nimble Bermuda sloops captured 298 American ships. The English navigator mistook Russian vessels for fishing sloops. Single mast, simple sloops are the most popular boats. A small flotilla of two other sloops also accompanied "Inconstant". The Royal Navy continued to build vessels rated as sloops during the interwar years. Therefore, historic ships could not point as far upwind as high-performance sloops. The 46 pirates were scattered among the three sloops. On September 10, the sloops anchored in Port Jackson. Maynard took command of the two armed sloops on 17 November. They were generally smaller versions of the escort sloops.