The “74”

The Invincible was a 74-gun French ship of the line, later a third-rate of the Royal Navy. Invincible 74 guns commanded by Sir John Bentley Kt in the years 1749-1752 and of which this drawing was made by his Clerk during the time of St John’s command.

Inner arrangement of a Russian 74-gun ship. Elements of Sané‘s design are present, but with a British-style layout.

During the early part of the 18th century British ship designers had made few significant advances in design, whereas French shipbuilding benefited from a remarkably creative period. At the time of the capture of Invincible, there was not one 74-gun ship in the Royal Navy. By 1805 at the battle of Trafalgar, three quarters of British ships of the line were of this singular design and the 74-gun ship had become the backbone of all major navies of the world.

Invincible was one of the first trio of a new and longer type of 74-gun ships. Until 1738, French 74s had been little more than 154 (French) feet in gundeck length, carrying just thirteen pairs of 36-pdr guns on the lower deck, fourteen pairs of 18-pdr guns on the upper deck and eight pairs of 8-pdr guns on the quarterdeck and forecastle, with the balance of the 74 guns made up of four small 4-pdr guns on the poop.

This was changed by François Coulomb’s design for the Terrible, launched in 1739 at Toulon. The gundeck length was stretched to 164 (French) feet, and the four small guns on the poop were eliminated, replaced by new gunports for an additional pair of 36-pdr guns on the lower deck and an extra pair of 18-pdr guns on the upper deck. This new gun establishment became the standard for all subsequent French 74s. The next two ships, Invincible designed by Pierre Morineau and Le Magnanime designed by Blaise Geslain, were begun in early 1741 at Toulon and were each even longer than Le Terrible.

At the First Battle of Cape Finisterre (14 May 1747) during the War of the Austrian Succession, Invincible was escorting a convoy of merchant ships when she was sighted by the British channel fleet of 16 ships of the line, which gave chase. Invincible attacked the British ships to give the convoy a chance to escape, and alone engaged six British warships. In the end with most of her crew dead or wounded she struck her colours. Gracious in defeat, the French Commander, Saint-Georges, handed his sword to Admiral George Anson.

HMS Invincible sank in February 1758 when she hit a sandbank in the East Solent. The ship remained upright for 3 days after its grounding allowing the crew to safely escape.

The “seventy-four” was a type of two-decked sailing ship of the line which nominally carried 74 guns. It was developed by the French navy in the 1740s and spread to the British Royal Navy where they were classed as third rates. From here, they spread to the Spanish, Dutch, Danish and Russian navies. The design was considered a good balance between firepower and sailing qualities, but more importantly, it was an appealing ideal for naval administrators and bureaucrats. Seventy-fours became a mainstay of the world’s fleets into the early 19th century when they began to be supplanted by new designs and by the introduction of steam powered ironclads.

As a standard type, the seventy-four was only an ideal construction. There was great variation between seventy-fours of different navies. In the period 1750-90, different ships could have displacements of anything at just under 2,000 tonnes up to 3,000 tonnes. The armament could also vary considerably with everything from 24-pounder to long 36-pounder guns and some seventy-four of the Danish navy actually only had 70 guns.

The first 74-gun ships were invented by the French as they rebuilt their navy during the early years of the reign of Louis XV. The new ship type was a very large two-decker big enough to carry the largest common type of gun (36-pounders) on the lower gun deck, something only three-deckers had done earlier. This great firepower was combined with very good sailing qualities compared to both the taller three-deckers and the shorter old-style 70-gun two-deckers, making the 74 the perfect combination of the two. A disadvantage of the 74 was that it was relatively expensive to build and man compared to the older type of two-decker.

The 74-gun ship carried 28 (24- to 36-pounders) on the lower gun deck, 28-30 (18- to 18-pounders) on the upper gun deck, and 14-18 (6- to 12-pounders) on the upper works. Crew size was around 500 to 750 men depending on design, circumstances and nationality, with British ships tending to have smaller crews than other navies. The French had large and small seventy-fours, called “grand modèle” and “petite modèle”, the waterline length of a “grand modèle” seventy-four could be up to 182 feet. This was copied by the Royal Navy in about two dozen such ships of their own, such as the HMS Colossus where they were known as Large, while the other seventy-fours built to be between 166–171 feet were known as Common.

Given the construction techniques of the day, the seventy-four approached the limits of what was possible. Such long hulls made from wood had a tendency to flex and sag over time. Increased maintenance could counter this to some extent, but this was of course costly. This limited the success of the even bigger two-deck 80-gun ships that were built in small numbers after the seventy-four had been introduced. Three-deckers did not have the same problem due to their additional deck giving more rigidity.

The significance of the 74s however is hard to overstate, as a summary of the ships of the line for all nations that were in commission at any time during the Revolutionary/Napoleonic Wars period.

    1st & 2nd raters (130–78 guns) 156

    3rd rate 74s (inc. 70 guns) 408

    3rd rate (60–68 guns) 199

The Royal Navy captured a number of the early French 74-gun ships during the War of the Austrian Succession (for example, Invincible, captured at the first battle of Cape Finisterre in 1747) and the Seven Years’ War and were greatly impressed by them compared to their own smallish 70-gun ships. As a result they started building them in great numbers from about 1760, as did most other European navies. Navies that were restricted by shallow waters, such as the Dutch and Scandinavian navies, at least early on tended to avoid the 74-gun ship to a certain degree due to its size and draught, preferring smaller two-deckers instead. Even so, the seventy-four was a standard feature in all European navies around 1800. Only a handful of 74-gun ships were commissioned into the United States Navy; the US Navy’s early sea power concentrated on their powerfully-built frigates.

The type fell into disuse after the Napoleonic Wars, when improved building techniques made it possible to build even bigger two-deckers of 84 or even 90 guns without sacrificing hull rigidity.

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