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The use of copper sheathing was first suggested by Charles Perry in 1708, though it was rejected by the Navy Board on grounds of high cost and perceived maintenance difficulties. The first experiments with copper sheathing were made in the late 1750s: the bottoms and sides of several ships' keels and false keels were sheathed with copper plates ...
HMS Alarm was a 32-gun fifth-rate Niger-class frigate of the Royal Navy, and was the first Royal Navy ship to bear this name. She was built at King's Yard in Harwich by John Barnard. [1] Copper-sheathed in 1761, she was the first ship in the Royal Navy to have a fully copper-sheathed hull. [2] [3]
This process of plating ship bottoms, referred to as “sheathing” or “coppering”, helped increase the speed and lifespan of ships. Copper was desired for this process because it reacts with seawater to create an oxide coating that prevents the build-up of barnacles, weeds, and other detritus, in addition to physically stopping shipworms ...
The ships were protected with wrought iron armor; their belt was 250 mm (9.8 in) thick amidships, where it protected the ships' propulsion machinery spaces and ammunition magazines. The belt extended for the entire length of the hull, but toward the bow it reduced in thickness to 180 mm (7.1 in), and at the stern, it was reduced to 150 mm (5.9 in).
The ship was designed with four gun decks mounting a total of 170 guns and would have measured 3,700 tons burden. [1] [2] She would have had a three tier stern gallery and would have featured full copper sheathing and a double ship's wheel. [3]
Hermione was a 32-gun Concorde-class frigate of the French Navy.Designed for speed, she was one of the first ships of the French Navy to receive a copper sheathing. At the beginning of the Anglo-French War of 1778, she patrolled in the Bay of Biscay, escorting convoys and chasing privateers.
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Copper sheathing: after many trials, copper was found to be a practicable means of protecting the hulls of ships from marine growth and fouling. Copper sheathing delayed the growth of weeds on the hull, improving the sailing performance of ships that had been long out of dock. This had significant strategic as well as tactical implications.