Canopus-class ship of the line

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

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.