Large repeat orders are one explanation for the Fletcher programme's production economics. The Flower example adds a method for determining what to build: earlier sloop work established the systems needed for long-range convoy escort and minesweeping. Those requirements drew on First World War convoy experience. A commercial hull was then selected to accommodate the equipment. Reproducing that hull allowed many small commercial yards to participate in construction. The sequence puts the required functions before the choice of ship design.
Notable Point · 36:17-37:29
Flower corvettes: define the equipment, then find the hull
Britain used sloop experience to define escort and minesweeping requirements, then selected a commercial hull that small yards could build in quantity.