Duncan-class ship of the line (1859)
| HMS Duncan, Halifax, Nova Scotia c. 1865 | |
| Class overview | |
|---|---|
| Name | Duncan class | 
| Operators | Royal Navy | 
| Preceded by | Conqueror class | 
| Succeeded by | Bulwark class | 
| Built | 1855–1861 | 
| In service | 1863–1870 | 
| Planned | 2 | 
| Completed | 2 | 
| Scrapped | 2 | 
| General characteristics | |
| Class & type | Duncan class | 
| Type | 101-gun screw two-decker | 
| Displacement | 5,950 long tons | 
| Tons burthen | 3,715 Builder's Old Measurement | 
| Length | 
 | 
| Beam | 58 ft 0 in (17.68 m) extreme | 
| Draught | Gibraltar (not masted or stores) 18 ft 0 in (5.49 m) forward, 22 ft 6 in (6.86 m) aft | 
| Depth of hold | 25 ft 6 in (7.77 m) | 
| Installed power | 
 | 
| Propulsion | 800 nhp | 
| Sail plan | 
 | 
| Speed | 
 | 
| Complement | 930 | 
| Armament | 
 | 
| Notes | Source: Lambert Battleships in Transition | 
The Duncan class of 101-gun two-decker steam line-of-battle ships are considered by Professor Andrew Lambert to have been the "final statement of the British design progress" for steam two-deckers. The class consisted of HMS Duncan and HMS Gibraltar. The Bulwark class had identical hulls. HMS Gibraltar was the last wooden steam line-of-battleship to commission as a private ship in the Royal Navy.