A sail-only central-battery ironclad in the 1700s

Would a sail-only central-battery ironclad have been feasible in the 1700s?

Not really: the answer doubts that eighteenth-century guns had enough individual firepower to make a small central battery worthwhile.

The proposed sail-only ironclad would use a central battery in the 1700s. The answer doubts that this would be worthwhile because such a layout relies on a small number of powerful guns. Eighteenth-century guns are considered too weak individually to justify concentrating the ship's firepower in that way. The objection concerns the available artillery; the brief exchange does not establish that building an armoured sailing hull was impossible.