Egret- and Bittern-class sloops, Hunt-class escort destroyers, and Black Swan-class sloops share a related hull design, with modifications such as changes in length. Their different speeds suggest a peacetime sloop could be designed with room for additional boilers. Fuel or water tanks could occupy the reserved space until conversion was needed. Torpedo launchers could likewise remain ashore as spares for existing destroyers, with provision made to fit them later.
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Designing sloop hulls for rapid destroyer conversion
A treaty-selective navy could standardise sloop hulls with reserved machinery and weapon space, allowing rapid conversion toward escort-destroyer performance in an emergency.