What would the lower deck of an equal-sized purpose-built warship have carried?
Short answerProbably 18-pounder guns for the period, with 24-pounders possible in some designs.
NotesAn equal-sized warship would probably carry 18-pounders on its lower deck, with 24-pounders possible in some designs. An East Indiaman used that strongly built deck for cargo. Calcutta's conversion placed 18-pounders below the upper-deck guns and carronades. A similar hull could therefore carry a much heavier broadside after receiving a naval battery.