Venetian ship San Carlo Borromeo

San Carlo Borromeo was a first-rank ship of the line of the Venetian navy, serving from 1750 to 1768.

San Carlo Borromeo was originally laid down in 1739 as part of the Leon Trionfante-class ship of the line, but her chief architect, Marco Nobile, so altered the design that it became the lead ship of its own class instead. In its final form, it had a length of slightly over 51 m, a displacement of c. 2300 tons, and armed with 74 cannon, although normally, in peacetime, she only carried 66 (28x40-pounders, 26x20-pounders, 12x14-pounders). She entered service in 1750. In 1758, under the command of Angelo Emo, a new mast configuration—rather than made out of single tree-trunks, they were composed from different pieces of wood—inspired by English models was tested.

Throughout its career, the ship was plagued by a tendency to lose its rudder in heavy weather; during a mission into the Atlantic Sea in 1758, she almost foundered off the coast of Portugal. Several commissions and experiments were conducted in subsequent years to find the cause of the problem and rectify it, however the ship was lost with all hands during a storm on 21 March 1768, while sailing in the Adriatic Sea.