Builders' plans can be compared by frame positions to reconstruct the ships' arrangement in three dimensions. Amethyst and Starling carried the same three twin 4-inch mountings, but their ready-use lockers and several smaller weapons arrangements differed. Their quarterdeck depth-charge rails and throwers followed the same layout, while spare-charge stowage varied and Amethyst carried a split Hedgehog anti-submarine mortar. The comparison also identifies different Oerlikon mounts, radar supports, searchlights, and positions for smoke floats. Even where accommodation and lower-deck arrangements were similar, Amethyst used part of a ballast-tank space for small-arms ammunition. These details distinguish individual ships within the class instead of treating one set of plans as representative of every sloop.
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Black Swan-class sloops through builders' plans
Detailed builders' plans expose the Black Swan class's internal arrangement, weapons, depth-charge gear, Hedgehog mortar, and ship-to-ship differences.