How large would a Tribal-style destroyer need to be with four twin 5-inch mounts and several twin 40 mm guns?
Short answerAbout 3,500 tons without missiles, and larger once missile magazines, computers, and control systems are added.
NotesThe proposed Tribal-style design would need roughly 3,500 tons even without a missile system. Four twin 5-inch mounts create a battery of eight guns with substantial magazine and handling demands. Three or four twin 40 mm mounts add more weight, arcs, and crew requirements. Missiles would force the ship larger again because their magazines, computers, sensors, and control spaces all consume protected volume. Every combat system brings supporting machinery and spaces with it.