^ Tell me about wrought iron reinforcing pieces for hulls. how does it looks like?
What are the first ships with with such iron reinforcement pieces? did it comes out by the time of Napoleon Bonaparte? Did the HMS Victory and USS Constitution build with these iron reinforcing things?
The effective limit to the size of a wooden ship was length: if you made it wider it got slower and harder to maneuver, and if you made it taller (added extra decks) it provided a massive wall of a hull to catch the wind and make it even less maneuverable. The 4 -decked
Sanctissima Trinidad was nicknamed "El Ponderoso" by its crew for just that reason.
But after a certain length in certain seas (and the North Atlantic was the effective 'test' of wooden ships in northern Europe) the ship suffered from 'hogging' or 'sagging' - when the hull and keel deform downward or upward due to wave action, causing, in extreme cases, the keel to snap and the ship to break up (it's still a problem: as late as 2013 a container ship sank due to hogging and I believe the resulting lawsuits are still on-gong).
The classical Greek Triremes had a cable stretched from stem to stern to provide 'counter-tension' and keep the ship more rigid in rough seas, so the problem was not limited to the sailing ships of the 16th - 19th century, either. But it effectively meant that all the wooden warships maxed out at just under 200 feet in length - any longer and the ship was less seaworthy, not more.
There were two possible solutions, if you didn't want to produce more "Ponderosos".
1. Diagonal wooden bracing within the hull, to increase the 'stiffness' of the combination of keel and frame. Robert Seppings, who was Master Shipwright at Chatham Naval Yard in Britain, introduced this (based on some Dutch experiments earlier) in 1800 in a frigate (
HMS Glenmore) that was being rebuilt, and then in a ship-of-the-line (
HMS Kent) being rebuilt in 1805.
This method has an obvious limitation, though: extra internal bracing reduces the space within the hull to carry anything else - like ammunition, rations, or crew - and so you quickly reach a point of diminishing returns where you have a ship that is wonderfully seaworthy but completely worthless,
2. Reinforce the wooden frame with wrought iron pieces, chiefly along the hull and at the connections between frame pieces, to increase the overall strength of the hull - and also replace wooden timbers that have to be grown over decades into the proper curved or angled shape for hull frame members, timbers that were becoming very difficult to afford in increasingly-timberless England in the late 18th century (as far back as the mid-1600s it was estimated to require 40 acres of Old Growth forest to build one large warship, and by the 18th century even with managed timberlands it took more acreage and up to 30 years to get the oak timbers preferred for ship-of-the-line framing), Seppings also helped to introduce this innovation after 1805 and especially after 1813 when he became Surveyer of the (Royal) Navy, or chief naval architect for the British Fleet.
HMS Victory was built 1759 - 1765 and had a gun deck 186 feet long,
USS Constitution was built in 1797 and had a hull 175 feet long, and both were pre-iron or wooden internal bracing.
By contrast,
HMS Queen, the last purely sailing ship of the line ordered by the Royal Navy and built in 1833 - 1839, had a 204 foot long gun deck and carried 110 guns, more guns, and heavier ones, than
HMS Victory (Of
Victory's 104 guns, only 28 were 32 pounders, the rest were 24 or 12 pounders, while 100 out of Queen's 110 guns were 32 pounders, giving her a far heavier 'broadside' firepower)