The initial 18-inch gun choice proves too heavy once the rest of the ship is considered. Comparing weapon weights and ranges leads to twelve 16.5-inch guns as an intermediate solution, followed by cuts to protection and other systems until the design fits. The smaller caliber gives up some maximum range while removing a substantial weight penalty and retaining an exceptionally heavy broadside. Combat power also depends on barrel count, range, hull balance, and the equipment sacrificed to carry the battery.
Notable Point · 15:28-18:43
Why the main battery drops to 16.5 inches
An overweight 18-inch-gun design retreats to twelve 16.5-inch weapons to preserve firepower within the available displacement.