Canopus-class ship of the line

The Canopus-class ships of the line were a class of nine 84-gun two-deck second rates of the Royal Navy. Their design was based on an enlarged version of the lines of the captured French ship Franklin, since commissioned in the Royal Navy as HMS Canopus, although this ship herself was not included as a member of the class. The earlier ships were initially ordered as 80-gun third rates, but this classification was altered by changes in the rating system in February 1817. This class of ships is sometimes referred to as the Formidable class.

HMS Vengeance, a Canopus-class ship of the line
Class overview
Name	Canopus-class ship of the line
Operators	Royal Navy
Preceded by	None
Succeeded by	Vanguard class
In service	10 November 1821 - 1929
Completed	9
General characteristics
Type	Ship of the line
Length	193 ft 10 in (59.08 m) (gundeck) 160 ft 2+5⁄8 in (48.835 m) (keel)
Beam	52 ft 4+1⁄2 in (15.964 m)
Propulsion	Sails
Armament	84 guns: Gundeck: 28 × 32-pounders, 2 × 68-pounder carronades Upper gundeck: 32 × 24-pounders Quarterdeck: 6 × 24-pounders, 10 × 32-pounder carronades Forecastle: 2 × 24-pounders, 4 × 32-pounder carronades
Notes	Ships in class include: Ganges, Asia, Vengeance, Formidable, Powerful, Clarence, Bombay, Thunderer, Monarch