Audacious-class ironclad

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HMS Vanguard with the later barque rig
Class overview
Name	Audacious class
Built	1867–1870
In commission	1870–1927
Completed	4
Lost	2
General characteristics
Type	Ironclad warship
Displacement	Audacious/Invincible: 6,106 tons Iron Duke/Vanguard: 6,034 tons
Length	Audacious/Invincible: 280 ft (85 m) Iron Duke/Vanguard: 341 ft 3 in (104.01 m)
Beam	54 ft (16 m)
Draught	Audacious/Invincible: 22 ft 7 in (6.88 m) Iron Duke/Vanguard: 23 ft 2 in (7.06 m)
Propulsion	Coal-fired reciprocating steam engines 6 boilers 2 shafts
Sail plan	Full-rigged ship later converted to barque-rig[1]
Speed	Audacious/Invincible: 13.5 knots (25.0 km/h; 15.5 mph) Iron Duke/Vanguard: 13 knots (24 km/h; 15 mph)
Complement	450
Armament	Audacious/Invincible: 10 × 9 inch guns 4 × 64-pounder guns Iron Duke/Vanguard: 10 × 12-ton, 9 inch (229 mm) RML guns 4 × 6 in (150 mm) 64-pounder (29 kg) RML 'chaser' guns (2 at bows; 2 at stern) 6 × 20-pounder (9 kg) guns Ram
Armour	Audacious/Invincible: 8 ft (2.4 m) waterline belt 6 to 8 in (150 to 200 mm) thick Central battery 6 to 8 in (150 to 200 mm) armour 10 in (250 mm) teak backing Iron Duke/Vanguard: Iron plating with teak backing Belt: 6 to 8 in (150 to 200 mm) Battery: 4 to 6 in (100 to 150 mm) Bulkheads: 4 to 5 in (100 to 130 mm)

The Audacious-class ironclad battleships were designed by Sir Edward Reed at the request of the Board of Admiralty to serve as second-class battleships on distant foreign stations.