The comparison separates capability from availability. London Naval Treaty rules allowed useful 600- to 2,000-ton sloops while limiting their guns, torpedoes, and designed speed. Bitttern- and Kingfisher-class examples could escort, sweep or lay mines, conduct anti-submarine work, and serve overseas, but their naval-standard subdivision and turbine machinery took longer to build. Matching annual destroyer orders with sloops from 1930 could have produced roughly two hundred modern escorts before the war. Once war began, Flowers used a simpler commercial-standard hull and machinery package that more yards could deliver quickly, while Black Swans and Hunts supplied capabilities worth preserving in parallel.
Chapter · 3:36:03-3:43:53
Why prewar sloops could not simply replace Flower-class Corvettes
Sloops were better fighting ships, but their naval-standard construction demanded a deliberate prewar programme rather than an improvised wartime substitution.